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SERVICE MANUAL Model JS068-C2 WARNING This servic e informatio n is designed for experience d repai r technician s only and is not designe d for use by the genera l public. It does not contai n warning s or caution s to advise non-technic al individu als of potentia l dangers in attemptin g to servic e a product. Product s powered by electricit y shoul d be service d or repaire d only by experience d professiona l technicia ns. Any attemp t to service or Repai r the produc t or product s deal t with in this servic e infor mation by anyone else could result in seriou s injury or death Version V1 Date 2023-03-02 Table of contents Contents 1. Introduction............................................................................................ 1 2. Features ................................................................................................ 7 3. Specifications ........................................................................................ 8 4. Sensors list............................................................................................ 9 5. Piping diagrams.....................................................................................10 6. Printed circuit board connector wiring diagram.....................................11 7. Functions and control ........................................................................... 14 8. Dimensional drawings ........................................................................... 26 9. Center of gravity .................................................................................. 26 10. Service Diagnosis ................................................................................ 27 11. Circuit diagrams .................................................................................. .49 12.Removal Procedure ............................................................................ .51 Domestic air conditioner Introduction 1.Introduction 1.1 Model Nameplate J S 0 6 8 - C2 series 24000 BTU Indoor unit Domestic air conditioner Intuoduction 1.2 Safety Cautions Be sure to read the following safety cautions before conducting repair work. The caution items are classified into “Warning” and “Caution”. The “Warning” items are especially important since they can lead to death or serious injury if they are not followed closely. The “Caution” items can also lead ● to serious accidents under some conditions if they are not followed. Therefore, be sure to observe all the safety caution items described below. About the pictograms △ This symbol indicates an item for which caution must be exercised. The pictogram shows the item to which attention must be paid. ○ This symbol indicates a prohibited action. The prohibited item or action is shown inside or near the symbol. ● This symbol indicates an action that must be taken, or an instruction. The instruction is shown inside or near the symbol. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates Normally, and explain the cautions for operating the product to the customer. 1.2.1 Embedded wire checking before installation Check the embedded wire diameter suitable to request: (Power supply from indoor: 2.5kw ≥1.0mm2 3.5kw,5kw ≥1.5mm2 7kw ≥2.5mm2 ; Power supply from outdoor ≥1.0mm2 ) Check the embedded wire are four roots, L/N/COM/GND; GND is needed, if not, thunder or high voltage wave ● from power grid will impact to the performance ● Using a multi-meter to test short circuit of the four roots wires, make sure no short circuit happen. ● 1.2.2 Caution in Repair ● Warning Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for a repair. Working on the equipment that is connected to a power supply can cause an electrical shook. If it is necessary to supply power to the equipment to conduct the repair or inspecting the circuits, do not touch any electrically charged sections of the equipment. If the refrigerant gas discharges during the repair work, do not touch the discharging refrigerant gas .The refrigerant gas can cause frostbite. 2 Domestic air conditioner Intuoduction When disconnecting the suction or discharge pipe of the compressor at the welded section, release the refrigerant gas completely at a well-ventilated place first. If there is a gas remaining inside the compressor , the refrigerant gas or refrigerating machine oil discharges when the pipe is disconnected, and it can cause injury. If the refrigerant gas leaks during the repair work, ventilate the area. The refrigerant gas can generate ● toxic gases when it contacts flames. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. Be sure to discharge the capacitor completely before conducting repair work . A charged capacitor can cause an electrical shock. Do not start or stop the air conditioner operation by plugging or unplugging the power cable plug. Plugging or unplugging the power cable plug to operate the equipment can cause an electrical shock or fire. Warning Do not repair the electrical components with wet hands . Working on the equipment with wet hands can ● cause an electrical shock ● Do not clean the air conditioner by splashing water. Washing the unit with water can cause an electrical ● shock. Be sure to provide the grounding when repairing the equipment in a humid or wet place, to avoid electrical shock. Be sure to turn off the power switch and unplug the power cable when cleaning the equipment. The internal fan rotates at a high speed, and cause injury. Do not tilt the unit when removing it. The water inside the unit can spill and wet the furniture and floor. ● Be sure to check that the refrigerating cycle section has cooled down sufficiently before conducting repair work. Working on the unit when the refrigerating cycle section is hot can cause burns. Use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen deficiency. 1.2.3 Cautions Regarding Products after Repair Warning Be sure to use parts listed in the service parts list of the applicable model and appropriate tools to 3 Domestic air conditioner Intuoduction conduct repair work. Never attempt to modify the equipment. The use of inappropriate parts or tools can cause an electrical shock, excessive heat generation or fire. When relocating the equipment, make sure that the new installation site has sufficient strength to withstand the weight of the equipment. If the installation site does not have sufficient strength and if the installation work is not conducted securely, the equipment can fall and cause injury. Be sure to install the product correctly by using the provided standard installation frame. For Incorrect use of the installation frame and improper installation can cause the equipment to fall, resulting integral in injury. units only For Be sure to install the product securely in the installation frame mounted on a window frame. integral If the unit is not securely mounted, it can fall and cause injury. units only Warning Be sure to use an exclusive power circuit for the equipment, and follow the technical standards related to ● the electrical equipment, the internal wiring regulations and the instruction manual for installation when ● conducting electrical work. ● Insufficient power circuit capacity and improper electrical work can cause an electrical shock or fire. Be sure to use the specified cable to connect between the indoor and outdoor units. Make the connections securely and route the cable properly so that there is no force pulling the cable at the connection terminals. Improper connections can cause excessive heat generation or fire. When connecting the cable between the indoor and outdoor units, make sure that the terminal cover does not lift off or dismount because of the cable. ● If the cover is not mounted properly, the terminal connection section can cause an electrical shock, excessive heat generation or fire. Do not damage or modify the power cable. Damaged or modified power cable can cause an electrical shock or fire. Placing heavy items on the power cable, and heating or pulling the power cable can damage the cable. ● Do not mix air or gas other than the specified refrigerant (R32) in the refrigerant system. If air enters the refrigerating system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leak and repair it before charging the refrigerant. After . charging refrigerant, make sure that there is no refrigerant leak. If the leak cannot be located and the repair work must be stopped, be sure to perform pump-down and close the service valve, to prevent the refrigerant gas from leaking into the room. The refrigerant gas 4 Domestic air conditioner Intuoduction itself is harmless, but it can generate toxic gases when it contacts flames, such as fan and other heaters, stoves and ranges. When replacing the coin battery in the remote controller, be sure to disposed of the old battery to prevent children from swallowing it. If a child swallows the coin battery, see a doctor immediately. Caution Installation of a leakage breaker is necessary in some cases depending on the conditions of the ● installation site, to prevent electrical shocks. Do not install the equipment in a place where there is a possibility of combustible gas leaks. ● If a combustible gas leaks and remains around the unit, it can cause a fire. Be sure to install the packing and seal on the installation frame properly. If the packing and seal are not installed properly, water can enter the room and wet the furniture and floor. 1.2.4 Inspection after Repair ● Warning Check to make sure that the power cable plug is not dirty or loose, then insert the plug into a power outlet all the way. If the plug has dust or loose connection, it can cause an electrical shock or fire. If the power cable and lead wires have scratches or deteriorated, be sure to replace them. ● Damaged cable and wires can cause an electrical shock, excessive heat generation or fire. Warning ● Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances since it can cause an electrical shock, excessive heat generation or fire. 5 Domestic air conditioner Intuoduction Caution Check to see if the parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure. Improper installation and connections can cause excessive heat generation, fire or an electrical shock. ● If the installation platform or frame has corroded, replace it. Corroded installation platform or frame can cause the unit to fall, resulting in injury. ● Check the grounding, and repair it if the equipment is not properly grounded. Improper grounding can cause an electrical shock. Be sure to measure the insulation resistance after the repair, and make sure that the resistance is 1 M ohm or higher. Faulty insulation can cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. ● Faulty drainage can cause the water to enter the room and wet the furniture and floor. 1.2.4 Using Icons Icons are used to attract the attention of the reader to specific information. The meaning of each icon is described in the table below: 1.2.5 Using Icons List Icon Type of Information Description ● Note A “note” provides information that is not indispensable, but may Note nevertheless be valuable to the reader, such as tips and tricks. A “caution” is used when there is danger that the reader, through Caution incorrect manipulation, may damage equipment, loose data, get Caution an ● unexpected result or has to restart (part of) a procedure. Warning Warning A “warning” is used when there is danger of personal injury. A “reference” guides the reader to other places in this binder or in Reference this manual, where he/she will find additional information on a specific topic. 6 Domestic air conditioner Features 2.Features Super quiet: Lower noise operation condition A-PAM DC inverter:With adoption of S-TYPE,S-PAM and PHASE control technology to works more stably at low-frequency,and is more energy-saving,mor powerful at high frequency. Long distance air supplying:The indoor unit is improved by optimized motor,fan and air duct so as to provide long distance airflow with 12m+ maximum. -15 10 Heating: When -15 can still heating natural heating maintenance:Heating Holding 10 temperature Confortable sleep The setting temperature and the indoor noise can be adjusted to a more comfortable level when you set the “sleep mode” during night sleep. Super match:One outdoor unit can match two or more indoor unit. DIY auto mode: Adjust the last fixed operation mode automatically. Turbo mode: Quick cooling or heating Auto restart: Automatic return to previous operation conditions after sudden power blackout 24 hours timer: Use the timer function to set on,or off,or from on to off,or from off to on. Intergrative valve cover:The valve cover is Intergrative. 2-way piping design: The pipe can shoot out both from left or right side. Easy clean design: The panel is easy to wash and the airflow vents can be detached easily Double 8 display:The display is Double 8 mode. 7 Domestic air conditioner Specifications 3.Specifications NOMINAL DISTRIBUTION SYSTEM VOLTAGE Phase / 1 Frequency Hz 50 Voltage V 230 NOMINAL CAPACITY and NOMINAL INPUT cooling KW Capacity rated Btu/h Power Consumption(Rated) heating 6.5(2.1-6.8) 6.8（2.2-7.0) 22180(7160-23200）23200(7505-23890） KW 2.03 1.88 W/W 3.21 3.61 Annual energy consumption KWh 1.01 0.94 Moisture Removal m³/h 2.8*10 ³ EER/ COP TECHNICAL SPECIFICATIONS Dimensions H*W*D mm 1008*225*318 Packaged Dimensions H*W*D mm 1085*329*403 Weight / KG 11.6 Gross weight / KG 14.4 Color / / White Sound Sound level pressure(Hi/Mid/Lo) Sound power(high) Piping Connections dB(A) 49/44/38 49/44/38 dB(A) 57 57 Liquid mm φ6.35 ×0.8 Gas mm φ12.7×0.8 Domestic air conditioner Specifications TECHNICAL SPECIFICATIONS-PARTS cooling Type Fan Heat exchanger heating Cross flow fan Motor W 40 Air flow rate(high) m³/h Speed(Hi/Mid/Lo) rpm 40 1100 1050/950/850 1200/1050/900 Type ML fin- Segment *stage*fitch 7HI-HX tube 3*16*1.4 Right,Left,Horizontal,Downward Air direction control Removable/Washable/Mildew Proof Air filter Note: the data are based on the conditions shown in the table below cooling heating Indoor: 27 DB/19 WB Indoor:20 DB Outdoor: 35 DB/24 WB Outdoor: 7 DB/6 WB 4 type Piping length 5m Conversation formulae Kcal/h= KW×860 Btu/h= KW×3414 cfm=m³/min×35.3 Sensors list Description Room and pipe sensor Its used for detecting room and evaporator temperature Qty 1 Domestic air conditioner Piping diagrams 5 Piping diagrams 12.7CuT 6.35CuT 12.7CuT 6.35CuT 10 Domestic air conditioner Printed circuit board connector wiring diagram 6. Printed circuit board connector wiring diagram Connectors PCB(1) (Control PCB) 1) CN9 Connector for fan motor 2) CN6 Connector for heat exchanger thermistor and Room temperature thermistor 3) CN5’ Connector for UP&DOWN STEP motor 4) CN11 CN11’ Connector for RIGHT&LEFT STEP motor 5) CN21 white line CN17(black line) Connector for indoor terminal N and L 6) CN7 Connector for display board 7) CON2 CON3 Connector for ion generator 8) CN23 (red line) Connector for communicate between the indoor board and the outdoor board 9) CN36 Connector for long-range control 10) CN34 Connector for wifi Module 11) CON1 Connector for fresh air 12) CN2 Connector for wired controller 13) CN51 Connector for room card Note: Other designations PCB(1) (Indoor Control PCB) 1) CN14 Connector for Forced operation ON / OFF switch 2) FUSE1 Fuse 3.15A/250VAC 3) Pin-1: OFF-match A code remote control; ON-match B code remote control Pin-2: OFF-no room card control; ON-with room card control Pin-3 and Pin-4 combined control, corresponding to 23, 26,33and35of the machine respectively 4) Jumper J1 and J2 combined control, corresponding to different series of display boards; ON means keep; OFF means cut OFF ON 3 ON ON OFF OFF 1 A B 4 ON OFF ON OFF 2 N_RC RC 35 33 26 23 J1 J2 DISPLAY SERIES UNIT MOUDLE JS068-C2 ON OFF 387/1045 OFF ON 324 OFF OFF 325/498 PCB MOUDLE 1 2 3 0011800646L (2 3 ） OFF OFF OFF 11 ON ON 317 4 OFF DISPLAY MOUDLE 0011800387D J1 J2 ON OFF Domestic air conditioner Printed circuit board connector wiring diagram PCB(1) 12 Domestic air conditioner Functions and control Wiring diagrams INDOOR UNIT 0010561514 INDOOR UNIT DIAGRAM M C0N3 C0N2 CN21 N FUSE1 T3.15A/250VAC W R C0N1 CN9 CN52 (L) BL ION GENERATOR FRESH AIR CN2 WIRED CONTROLLER CN5' CN5 UP-DOWN STEPMOTOR CN11 CN11' CN23 S CN51 CN34 ON 1234 SW2 Y/G DC FAN MOTOR CN1 SW1 CN14 CN7 LEFT STEPMOTOR ROOM CARD WIFI EMERGENCY SWITCH DISPLAY BOARD CN6 AMBIENT TEMP.SENSOR PIPING TEMP.SENSOR W B CN10 R RIGHT STEPMOTOR Y/G Y/G 1(N)2 (L)3(C) BR BL GND POWER SUPPLY TO OUTDOOR UNIT Notes: 1.The dotted parts are optional. 2.The two pins of CN51 should be shorted, when the second channel(RC) of SW2 is selected. 13 R:Red B:Black W:White BL:Blue Y:Yellow BR:Brown Y/G:Yellow/Green Domestic air conditioner Functions and control 7.Funcitions and control 7.1 Main functions and control specification 7.1.1 Automatic operation When the running mode is turned to automation after starting the system, the system will first determine the running mode according to the current room temperature and then will run according to the determined mode. Tr in the following selection conditions means room temperature, Ts means setting temperature, Tp means temperature of indoor coil pipe Tr≥Ts-3℃ Choose Cooling Mode Tr＜Ts-3℃ Choose Heating Mode After turning to the automation mode, the running mode can be switched between cooling mode, fan mode and heating mode according to the change of the indoor ambient temperature. But the automatic conversion between cooling mode and heating mode must be conducted after 15 minutes. 7.1.2 Cooling operation mode Temperature control range: 16℃---30℃ Temperature difference: r1℃ * Control features: When Tr（input airflow）>Ts（set temperature）+ temperature Backlash A, the compressor will be opened, the indoor fan will operate at the set speed and the mode signal will be sent to the outdoor system. When Tr（input airflow） Ts（set temperature）- temperature Backlash B, the compressor will be shutted, the indoor fan will operate at the set speed and the mode signal will be sent to the outdoor system. The system will keep the original status if Tr= Ts. Airflow speed control: (temperature difference 1℃) Automatic: When Tr≤Ts+3℃, high speed. When Ts+1℃≤Tr<Ts+3℃, medium speed When Tr<Ts+1℃, low speed When the sensor is off, low speed When the airflow speed has no delay from the high to low switching, the speed should be delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch. Manus: When the system is operating, you can set the high, medium or low speed manually. (When the sensor is on or off, the system will change the speed 2 seconds after receiving the signal.) *Airgate location control: the location for the airgate can be set according to your needs. *Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or dehumidifying). When the compressor works continuously for 6 minutes and the temperature of the indoor coils has been below one centigrade for 10 seconds, the compressor will be stopped and the malfunction will be recorded in the malfunction list. The indoor system will continue to run. When the temperature of the indoor coil is raised to 9℃, the compressor will be restarted again (the requirement of 3 minutes’ delay should be satisfied.) * timing system on/off function. * Dormant control function. 14 Domestic air conditioner Functions and control 7.1.3 Dehumidifying mode. * temperature control range: 16---30℃ * temperature difference: r1℃ Control feature: send the dehumidifying signal to the outdoor system. When Tr>Ts+2℃, the compressor will be turned on, the indoor fan will operate at the set speed. When Tr is between the Ts and Ts+2℃, the outdoor system will operate at the high dehumidifying frequency for 10 minutes and then at the low dehumidifying mode for six minutes. The indoor fan will operate at low speed. When Tr< Ts-1.5℃, the outsystem will be stopped, the indoor fan will be stopped for 3 minutes and then turned to the low speed option. All the frequency converses have a ±1℃ difference. 区 段 Ts+20AD 值（约 2℃） 1 （COOL） Ts 区段 2(DRY) Ts+3AD 值（约 0.5℃） Ts-12AD 值（约 1.5℃） 区段 3（停机） * Wind speed control: Automatic: When Tr≥ Ts+ 5℃, high speed. When Ts+3℃dTr< Ts+5℃, medium speed. When Ts+2℃dTr< Ts+3℃, low speed. When Tr<Ts+2℃, light speed. If the outdoor fan stopped, the indoor fan will be paused for 3 minutes. If the outdoor fan stopped for more than 3 minutes and the outdoor system still operates, the system will be changed into light speed mode. When the airflow speed has no delay from the high to low switching, the speed should be delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch. Manual: When the sensor is off or Tr< Ts+3℃, the manual operation can not be made. (obligatory automatic operation.) *Airgate location control: the location for the airgate can be set according to your needs. *Defrosting function: preventing the frosting on the indoor heat exchanger (when cooling or dehumidifying). When the compressor works continuously for 6 minutes and the temperature of the indoor coils has been below 1℃ for 10 seconds, the compressor will be stopped and the malfunction will be recorded in the malfunction list. The indoor system will continue to run. When the temperature of the indoor coil is raised to 9℃, the compressor will be restarted again (the requirement of 3 minutes’ delay should be satisfied.) * Coil protection (synchronic overheating protection) are installed for the four directions latch 15 Domestic air conditioner Functions and control malfunctions when dehumidifying. * Timing system on/off function. * Dormant control function. 7.1.4 Heating operation mode. * temperature control range: 16---30℃ * temperature difference: r1℃ * control feature: the temperature compensation is automatically added and the system will send the heating signals to the outdoor system. If Tr+0.5℃dTs, the outdoor compressor is turned on, the indoor fan will be at the cold air proof mode. If Tr>Ts+1.5℃, the outdoor system is turned off, the indoor fan will be at the heat residue sending mode. *Indoor fan control manual control: You can choose high, medium, low and automatic speed control. Automatic: When Tr<Ts, high speed. When Ts≤Tr≤Ts+2℃, medium speed. When Tr> Ts+2℃, low speed. When the airflow speed has no delay from the high to low switching, the speed should be delayed for 3 minutes (remain at high speed for 3 minutes.) before the next switch. *Airgate location control: the location for the airgate can be set according to your needs. Coldair proof operation 1. The fan control functions as below: 设ᐃ 37（THHOT4） 35 25 37（THHOT3） 中风 35（THHOT2） 低风 25（THHOT1） 微弱风 23（THHOT0） 停止 * Residue heat sending. The indoor fan will send the residue heat at a low speed for 20 seconds. If other conditions are satisfied, when the compressor stops, the indoor system will operate at a light speed. The indoor fan will stop when the coil temperature is below the THHOT0. * Defrosting. When the system receives the defrosting signal from outdoors, the indoor fan will stop and the indoor temperature display won’t change. At the time, any indoor coil malfunctions will be neglected. When the outdoor defrosting finishes, the coil malfunction will still be neglected until the compressor has been started up for 30 seconds. The indoor temperature display will not change and the system operates at the cold air proof mode. * Automatic heating temperature compensation: when the system enters the heating mode, the 16 Domestic air conditioner Functions and control temperature compensation (4℃) will be added. When the status is switched off, the compensation will be erased. 7.1.5 Strength operation The system enters the mode after receiving the ‘strength signal’. Send strength operation signal to the outdoor system. The mode change finishes the strength operation. Entering ‘mute’, you can have normal operation or signal control such as timing to finish the strength operation. When the system is at the automatic option with the strength/ mute function, if the system enters the cooling mode, the cooling strength/ mute function will be offered; if the system enters the heating mode, then the heating strength/ mute function will be offered; if the system enters the airflow mode, there will be no strength/ mute function. 7.1.6 Mute operation The system enters the mode after receiving the ‘mute signal’. a. Mute heating: the airflow speed is slight, the system sends the mute signal to the outdoor system. b. mute cooling: the airflow speed is slight, the system sends the mute signal to the outdoor system. When the compressor operates, the airflow speed is mute speed. EEPROM is adaptable. Mute operation can not work under the dehumidifying and airflow-sending operation. 7.1.7 Air refreshing（This model does not choose） After receiving the signal from the remote control, (HV series: the background light of the ‘health’ logo is green. HS series: the ‘health’ indicator will be lighted). If the fan operates, the Nano-Aqua operates to realize the ions sending function. If the indoor fan stops, the Nano-Aqua is turned off. When the Nano-Aqua is turned off, if the air refreshing system is turned on, the Nano-Aqua will be turned on when the fan operates. 7.1.8 Timing You can set 24 hours’ on/off timing accordingly. After the setting, the timing indicator will be lightened. Also, the light will be turning off after the timing is finished. The followings are several timing methods. 1.system /on timing: The timing indicator will be lightened and the indoor system is under the waiting mode. The light will be turned off when the timing is finished and the rest of the system will operate under a normal condition. The timing starts since the last reception of the timing signal. 2.system /off timing: When the system is turned on, the timing indicator is lightened, the rest of the system will operated under a normal condition. When set time comes, the indicator light will be turned off and the system will be turned off. If you have set the dormant functions, the order of your settings will be operated according to the timing settings. 3 .system /on and off timing: The settings will be completed according to the orders.. 17 Domestic air conditioner Functions and control 7.1.9 Dormant operation The dormant timing is an eight hours unadaptable one. The timing signs are shown on the V series board. (RC series show the dormant signal, the timing light is lighted on the 6 lights board). 2.1 Under the cooling/ dehumidifying operation, after the setting of the dormant operation, the set temperature will be raised for 1 centigrade after 1 hour’s operation and will be raised for 1 centigrade 1 hour later. The system will keep this status for 6 hours and then close. 2.2 Under the heating mode, after the setting of the dormant operation, the setting temperature will fall 2 centigrade after 1 hour’s operation and will fall 2 centigrade 1 hour later. 3 hours after the preceding operations, the set temperature will be raised for 1 centigrade and the system will keep this status for 3 hours and then close down. 2.3 During the dormant time, except the change of the system mode or a new press on the dormant setting keys, the timing of the 8 hours dormancy will take the first timing as the start time, any presses on other keys will not affect the original timing. 2.4 Indoor fan control under the dormant operation. If the indoor fan is at the high speed before the dormant operation setting, the speed will be turned to medium after the setting. If the fan is at the medium speed before the dormant setting, the speed will be turned to low after the setting. If the fan is at the low speed before the dormant setting, the speed will not change. 7.1.10 Urgent on/off input Press the urgency button the buzzer will ring. The system will enter the automatic mode if you don’t press the button for more than 5 seconds. Under the system off mode, if you press the urgency key for 5 to 10 seconds, the system will start the test operation. Under the system off mode, if you press the urgency key for 10 to 15 seconds, the display screen will show the resume of the last malfunction. If the system is under operation, the press on the urgency key will stop it. Under the system off mode, the display screen will show automatic running sign. Under the system off mode, the system will not receive the remote control signal if the press on the urgency key doesn’t last for 15 seconds or if the key is loosened. Urgency operation: If you press the urgency key for less than 5 seconds, the buzzer will ring when you press the on/off key. The system will enter the urgency operation when the urgency key is loosened. The urgency operation is fully automatic. Test operation. The inlet temperature sensor doesn’t work, the indoor fan and the indoor air direction board motor works synchronically. High speed airflow, cooling, outdoor system on, etc, will send the ambient temperature 30 centigrade and coil temperature 16 centigrade information to the outdoor system. Test operation The defrost protection of the evaporator doesn’t work. The temperature control doesn’t work. The test operation will be finished in 30 minutes. The test operation can be stopped by the relative commands from the remote control. 18 Domestic air conditioner Functions and control 7.1.11 Low load protection control In order to prevent the frosting of the indoor heat interaction device, the outdoor system will be stopped if the indoor heat interaction temperature is below 1℃ centigrade for 5 minutes, but the fan will continue to operate. The outdoor system will be started again when the heat interaction temperature is above 9 centigrade and the system has been stopped for 3 minutes. The malfunction will be stored in the malfunction resume and will not be revealed 7.1.12 High load protection control The outdoor system will be stopped if the coil temperature is above 63℃ for 2 minutes. The indoor fan will be controlled by the thermostat. The outdoor system can be restarted when the coil temperature is below 45℃ and the system has been stopped for 3 minutes. The malfunction will be stored in the malfunction resume and will not be revealed. 7.1.13 Abnormal operation of indoor system When the outdoor system operates, if the indoor system operation differs from the outdoor system, the abnormal operation malfunction will be reported. 10s after the report, the indoor system will be closed. Outdoor system mode Indoor system mode conflicts cooling heating yes cooling cooling no cooling airflow no heating heating no heating airflow yes heating cooling yes 7.1.14 Malfunction list resume. Nothing is presented if there is no code list. The malfunction display will automatically finish in 10 seconds. The remote control only receives the signals for stop. According to the signals, the malfunction resume presentation finishes. The resume restores after the power supply restores. 7.1.15 Abnormality confirmation approaches 1. indoor temperature sensor abnormality: Under the operation, the normal temperature ranges from 120 degree to -30 degree. When the temperature goes beyond this range, the abnormality can be confirmed. If the temperature goes back into the range, the system will automatically resume. 2 .indoor heat interaction sensor abnormality: Under the operation, the normal temperature ranges from 120 degree to -30 degree. When the temperature goes beyond this range, the abnormality can be confirmed. If the temperature goes back into the range, the system will automatically resume. 19 Domestic air conditioner Functions and control 3 .indoor malfunction: Out door malfunction: When the indoor system receives the outdoor malfunction codes, it will store the code into E2 for the malfunction list resume. The indoor system will continue to operate according to the original status, the malfunction code will not be revealed or processed. 4. transmission abnormality: If the indoor system can’t receive the outdoor system for 8 minutes, the communication abnormality can be confirmed and reported and the outdoor system will be stopped. 7.1.16 Single indoor system operation * Enter condition: First, set the high speed airflow and 30 centigrade set temperature, then press the dormant keys for 6 times within 7 seconds, the system will feedback with 6 rings. * After the system enters the separate indoor system operation mode, the indoor system will operate according to the set mode and neglect the communication signals of the outdoor system. However, it has to send signals to the outdoor system. * Quitting condition: This mode can be quitted after receiving the quitting signal from the remote control or urgency system. The indoor system thus can quit the single operation mode. 7.1.17 Power cut compensation * Entering condition: Press dormant button 10 times within 7 second, the buzzer will ring 4 times and the present system status will be stored into the EEPROM of the indoor system. * After entering the power cut compensation mode, the processing of the indoor system should be as the followings: Remote control urgency signal: operate according to the remote control and the urgent conditions, the present status will be stored into the EEPROM of the indoor system. * Quitting conditions: Press dormant button 10 times within 7 seconds and the buzzer will ring twice. 7.1.18 Test program First, connect the test program terminal on the mainboard. Then connect the system to the power circuit. The test program will operate as follows. HV series display: The buzzer rings for one time—the signal will be sent to outdoor system for 0.5 second— the violet is sent for 0.5-- the background light turns to white—the back ground light turns to white—the background light turns to white—the background light is fully lighted for 0.5 second—LED screen lights for 0.5 second— the step-in motor fully output for 0.5 second—then the motor doesn’t output for 0.5 second—the motor fully output again for 0.5 second. The test program finishes. 7.1.19 Time cutting function: Connect the test program terminal on the mainboard after connecting the system to the power circuit. The CPU of the main control will be 60 times faster. 7.2 Value of thermistor Room sensor and Pipe Sensor 20 Domestic air conditioner Functions and control R25℃=10KΩ±2% B25℃/50℃=3700K±2% Temp.((℃)) Max.(KΩ) Normal(KΩ) Min.(KΩ) -30 165.2170 147.9497 132.3678 -1.94 1.75 -29 155.5754 139.5600 125.0806 -1.93 1.74 -28 146.5609 131.7022 118.2434 -1.91 1.73 -27 138.1285 124.3392 111.8256 -1.89 1.71 -26 130.2371 117.4366 105.7989 -1.87 1.70 -25 122.8484 110.9627 100.1367 -1.85 1.69 -24 115.9272 104.8882 94.8149 -1.83 1.67 -23 109.4410 99.1858 89.8106 -1.81 1.66 -22 103.3598 93.8305 85.1031 -1.80 1.64 -21 97.6556 88.7989 80.6728 -1.78 1.63 -20 92.3028 84.0695 76.5017 -1.76 1.62 -19 87.2775 79.6222 72.5729 -1.74 1.60 -18 82.5577 75.4384 68.8710 -1.72 1.59 -17 78.1230 71.5010 65.3815 -1.70 1.57 -16 73.9543 67.7939 62.0907 -1.68 1.55 -15 70.0342 64.3023 58.9863 -1.66 1.54 -14 66.3463 61.0123 56.0565 -1.64 1.52 -13 62.8755 57.9110 53.2905 -1.62 1.51 -12 59.6076 54.9866 50.6781 -1.60 1.49 -11 56.5296 52.2278 48.2099 -1.58 1.47 -10 53.6294 49.6244 45.8771 -1.56 1.46 -9 50.8956 47.1666 43.6714 -1.54 1.44 -8 48.3178 44.8454 41.5851 -1.51 1.42 -7 45.8860 42.6525 39.6112 -1.49 1.40 -6 43.5912 40.5800 37.7429 -1.47 1.39 -5 41.4249 38.6207 35.9739 -1.45 1.37 -4 39.3792 36.7676 34.2983 -1.43 1.35 -3 37.4465 35.0144 32.7108 -1.41 1.33 -2 35.6202 33.3552 31.2062 -1.38 1.31 -1 33.8936 31.7844 29.7796 -1.36 1.29 0 32.2608 30.2968 28.4267 -1.34 1.28 1 30.7162 28.8875 27.1431 -1.32 1.26 2 29.2545 27.5519 25.9250 -1.29 1.24 3 27.8708 26.2858 24.7686 -1.27 1.22 4 26.5605 25.0851 23.6704 -1.25 1.20 5 25.3193 23.9462 22.6273 -1.23 1.18 6 24.1432 22.8656 21.6361 -1.20 1.16 7 23.0284 21.8398 20.6939 -1.18 1.14 8 21.9714 20.8659 19.7982 -1.15 1.12 9 20.9688 19.9409 18.9463 -1.13 1.09 22 Tolerance(℃) Domestic air conditioner Functions and control 10 20.0176 19.0621 18.1358 -1.11 1.07 11 19.1149 18.2270 17.3646 -1.08 1.05 12 18.2580 17.4331 16.6305 -1.06 1.03 13 17.4442 16.6782 15.9315 -1.03 1.01 14 16.6711 15.9601 15.2657 -1.01 0.99 15 15.9366 15.2770 14.6315 -0.98 0.96 16 15.2385 14.6268 14.0271 -0.96 0.94 17 14.5748 14.0079 13.4510 -0.93 0.92 18 13.9436 13.4185 12.9017 -0.91 0.90 19 13.3431 12.8572 12.3778 -0.88 0.87 20 12.7718 12.3223 11.8780 -0.86 0.85 21 12.2280 11.8126 11.4011 -0.83 0.83 22 11.7102 11.3267 10.9459 -0.81 0.80 23 11.2172 10.8634 10.5114 -0.78 0.78 24 10.7475 10.4216 10.0964 -0.75 0.75 25 10.3000 10.0000 9.7000 -0.75 0.75 26 9.8975 9.5974 9.2980 -0.76 0.76 27 9.5129 9.2132 8.9148 -0.80 0.80 28 9.1454 8.8465 8.5496 -0.84 0.83 29 8.7942 8.4964 8.2013 -0.87 0.86 30 8.4583 8.1621 7.8691 -0.91 0.90 31 8.1371 7.8428 7.5522 -0.95 0.93 32 7.8299 7.5377 7.2498 -0.98 0.97 33 7.5359 7.2461 6.9611 -1.02 1.00 34 7.2546 6.9673 6.6854 -1.06 1.04 35 6.9852 6.7008 6.4222 -1.10 1.07 36 6.7273 6.4459 6.1707 -1.13 1.11 37 6.4803 6.2021 5.9304 -1.17 1.14 38 6.2437 5.9687 5.7007 -1.21 1.18 39 6.0170 5.7454 5.4812 -1.25 1.22 40 5.7997 5.5316 5.2712 -1.29 1.25 41 5.5914 5.3269 5.0704 -1.33 1.29 42 5.3916 5.1308 4.8783 -1.37 1.33 43 5.2001 4.9430 4.6944 -1.41 1.36 44 5.0163 4.7630 4.5185 -1.45 1.40 45 4.8400 4.5905 4.3500 -1.49 1.44 46 4.6708 4.4252 4.1887 -1.53 1.47 47 4.5083 4.2666 4.0342 -1.57 1.51 48 4.3524 4.1145 3.8862 -1.61 1.55 49 4.2026 3.9686 3.7443 -1.65 1.59 50 4.0588 3.8287 3.6084 -1.70 1.62 51 3.9206 3.6943 3.4780 -1.74 1.66 52 3.7878 3.5654 3.3531 -1.78 1.70 23 Domestic air conditioner Functions and control 53 3.6601 3.4416 3.2332 -1.82 1.74 54 3.5374 3.3227 3.1183 -1.87 1.78 55 3.4195 3.2085 3.0079 -1.91 1.82 56 3.3060 3.0989 2.9021 -1.95 1.85 57 3.1969 2.9935 2.8005 -2.00 1.89 58 3.0919 2.8922 2.7029 -2.04 1.93 59 2.9909 2.7948 2.6092 -2.08 1.97 60 2.8936 2.7012 2.5193 -2.13 2.01 61 2.8000 2.6112 2.4328 -2.17 2.05 62 2.7099 2.5246 2.3498 -2.22 2.09 63 2.6232 2.4413 2.2700 -2.26 2.13 64 2.5396 2.3611 2.1932 -2.31 2.17 65 2.4591 2.2840 2.1195 -2.36 2.21 66 2.3815 2.2098 2.0486 -2.40 2.25 67 2.3068 2.1383 1.9803 -2.45 2.29 68 2.2347 2.0695 1.9147 -2.49 2.34 69 2.1652 2.0032 1.8516 -2.54 2.38 70 2.0983 1.9393 1.7908 -2.59 2.42 71 2.0337 1.8778 1.7324 -2.63 2.46 72 1.9714 1.8186 1.6761 -2.68 2.50 73 1.9113 1.7614 1.6219 -2.73 2.54 74 1.8533 1.7064 1.5697 -2.78 2.58 75 1.7974 1.6533 1.5194 -2.83 2.63 76 1.7434 1.6021 1.4710 -2.88 2.67 77 1.6913 1.5528 1.4243 -2.92 2.71 78 1.6409 1.5051 1.3794 -2.97 2.75 79 1.5923 1.4592 1.3360 -3.02 2.80 80 1.5454 1.4149 1.2942 -3.07 2.84 81 1.5000 1.3721 1.2540 -3.12 2.88 82 1.4562 1.3308 1.2151 -3.17 2.93 83 1.4139 1.2910 1.1776 -3.22 2.97 84 1.3730 1.2525 1.1415 -3.27 3.01 85 1.3335 1.2153 1.1066 -3.32 3.06 86 1.2953 1.1794 1.0730 -3.38 3.10 87 1.2583 1.1448 1.0405 -3.43 3.15 88 1.2226 1.1113 1.0092 -3.48 3.19 89 1.1880 1.0789 0.9789 -3.53 3.24 90 1.1546 1.0476 0.9497 -3.58 3.28 91 1.1223 1.0174 0.9215 -3.64 3.33 92 1.0910 0.9882 0.8942 -3.69 3.37 93 1.0607 0.9599 0.8679 -3.74 3.42 94 1.0314 0.9326 0.8424 -3.80 3.46 95 1.0030 0.9061 0.8179 -3.85 3.51 24 Domestic air conditioner Functions and control 96 0.9756 0.8806 0.7941 -3.90 3.55 97 0.9490 0.8558 0.7711 -3.96 3.60 98 0.9232 0.8319 0.7489 -4.01 3.64 99 0.8983 0.8088 0.7275 -4.07 3.69 100 0.8741 0.7863 0.7067 -4.12 3.74 101 0.8507 0.7646 0.6867 -4.18 3.78 102 0.8281 0.7436 0.6672 -4.23 3.83 103 0.8061 0.7233 0.6484 -4.29 3.88 104 0.7848 0.7036 0.6303 -4.34 3.92 105 0.7641 0.6845 0.6127 -4.40 3.97 106 0.7441 0.6661 0.5957 -4.46 4.02 107 0.7247 0.6482 0.5792 -4.51 4.07 108 0.7059 0.6308 0.5632 -4.57 4.12 109 0.6877 0.6140 0.5478 -4.63 4.16 110 0.6700 0.5977 0.5328 -4.69 4.21 111 0.6528 0.5820 0.5183 -4.74 4.26 112 0.6361 0.5667 0.5043 -4.80 4.31 113 0.6200 0.5518 0.4907 -4.86 4.36 114 0.6043 0.5374 0.4775 -4.92 4.41 115 0.5891 0.5235 0.4648 -4.98 4.45 116 0.5743 0.5100 0.4524 -5.04 4.50 117 0.5600 0.4968 0.4404 -5.10 4.55 118 0.5460 0.4841 0.4288 -5.16 4.60 119 0.5325 0.4717 0.4175 -5.22 4.65 120 0.5194 0.4597 0.4066 -5.28 4.70 25 Domestic air conditioner Seivice diagnosis 8.Dimensional 28 2 unit:mm 318 645 225 1008 9.Center of gravity unit:mm 1008 225 431.5 318 147.5 99 Domestic air conditioner 26 Service Diagnosis 10 Service Diagnosis 10.1 Caution for Diagnosis The operation lamp flashes when any of the following errors is detected. 1.When a protection device of the indoor or outdoor unit is activated or when the thermistor malfunctions, disabling equipment operation. 2.When a signal transmission error occurs between the indoor and outdoor units.In either case, conduct the diagnostic procedure described in the following pages. 1 .2 Problem Symptoms and Measures Symptom None of the units Check Item Details of Measure Check the power supply. Check to make sure that the rated voltage is supplied. Check the indoor PCB Check to make sure that the indoor PCB is broken operates Operation sometimes stops. A power failure of 2 to 10 cycles can stop air conditioner Check the power supply. operation. Set the units to cooling operation, and compare the Equipment operates but does not cool, or does not heat (only for heat pump) Check for faulty operation temperatures of the liquid side connection pipes of the of the electronic connection section among rooms to check the opening and expansion valve. closing operation of the electronic expansion valves of the individual units. Diagnosis by service port pressure and operating Check for insufficient gas. current. Large operating noise and vibrations Check to make sure that the required spaces for installation (specified in the Technical Guide, etc.) are provided. Check the installation condition. 10.3 Parameter of primary electronic appliance NO 1 N am e F an m otor P a ra m e te r P ic tu re R ated voltage: DC310V R ated current:0 .2A R ated frequenc y: - 27 Domestic Air Conditioner Service Diagnosis 10.4 Error Codes and Description indoor display Split board: LED1 light of outdoor PCB flash; All-in-one board: LED2 light of outdoor PCB flash OUTDOOR ERROR CODE FAULT DESCRIPTION (LED FLASH TIMES) SPARE PART Indoor PCB Indoor and Outdoor E7 15 Communication fault between indoor Outdoor PCB and outdoor units Power module Communication wiring Indoor Malfunction E1 / Indoor temperature sensor failure E2 / pipe temperature sensor failure E4 / Indoor EEPROM failure Room temperature sensor Indoor PCB pipe temperature sensor Indoor PCB Indoor PCB pipe temperature sensor E5 22 Indoor anti-frosting protection Indoor PCB Indoor motor pipe temperature sensor E9 21 Indoor unit overload in heating mode Indoor PCB Indoor motor E14 Outdoor Malfunction / F1 2 F2 24 F3 4 F4 8 F6 12 Indoor fan motor malfunction IPM protection Instantaneous over-current protection of the compressor Indoor motor Indoor PCB Power module Refrigerant Power module Refrigerant compressor Communication error between Power Power module module and main PCB board. Outdoor PCB Compressor discharging temperature Outdoor PCB protection discharge sensor outdoor ambient sensor failure F7 11 Suction temperature sensor failure F8 9 DC fan motor malfunction outdoor ambient sensor Suction temperature sensor outdoor PCB outdoor PCB outdoor motor Power module F9 26 Module reset Outdoor PCB compressor The wiring of compressor F11 18 Loss of synchronism detection compressor Power module F12 1 EEPROM failure 28 Outdoor PCB Service Diagnosis OUTDOOR ERROR CODE (LED FLASH TIMES) Lack of refrigerant Refrigerant 16 F14 17 4-way valve reverse failure 4-way valve F19 6 Power over/under voltage protection Power module F20 5 High pressure protection F21 10 Outdoor coil temperature sensor F23 Malfunction SPARE PART F13 F22 Outdoor FAULT DESCRIPTION 3 25 F24 27 F25 13 F27 F28 7 19 Outdoor Alternating current over current protection Outdoor pipe temperature sensor Outdoor PCB Defrost temperature sensor Power module Refrigerant compressor Compressor U-phase overcurrent Power module Compressor V-phase overcurrent Refrigerant Compressor W-phase overcurrent compressor CT detection current abnormal Power module protection Compressor Abnormal of compressor discharge sensor Compressor current sampling circuit fault Compressor position detection circuit fault discharge sensor Outdoor PCB Power module Outdoor PCB compressor Power module Outdoor PCB compressor Power module F35 38 Compressor driver board failure Outdoor PCB Compressor F43 Fixed frequency AC FE 46 Model matching abnormality Refrigerant leaking detection / malfunction 29 / Refrigerant Service Diagnosis 10.4.1 Indoor Display Outdoor display Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes Trouble shooting Thermistor or Related Abnormality E1: Room temperature sensor failure E2: Heat-exchange sensor failure LED1 flash 10 times Defrost temperature sensor failure LED1 flash 11 times Suction temperature sensor failure LED1 flash 12 times Ambient temperature sensor failure LED1 flash 13 times Discharge temperature sensor failure The temperatures detected by the thermistors are used to determine thermistor errors When the thermistor input is more than 4.92V or less than 0.08V during compressor operation. Note: The values vary slightly in some models Faulty connector connection Faulty thermistor Faulty PCB * Caution: Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred. Check the connector connection. NO Is it normal? Correct the connection Yes Thermistor resistance check NO Is it normal? Replace the thermistor Yes Replace the indoor PCB Thermistor resistance inspection method: Remove the connector of the thermistor on the PCB, and measure the resistance of thermistor using tester. The relationship between normal temperature and resistance is shown in the value of indoor thermistor. 30 Service Diagnosis 10.4.2 Indoor Display Indoor display Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes Trouble shooting EEPROM abnormal E4: Indoor EEPROM error F12: Outdoor EEPROM error; Outdoor LED1 flash 1 times The Data detected by the EEPROM are used to determine MCU When the data of EEPROM is error or the EEPROM is damaged ■ ■ ■ Faulty EEPROM data Faulty EEPROM Faulty PCB * Caution: Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Replace the indoor or outdoor mainboard. 31 Service Diagnosis 10.4.3 Indoor DC fan motor malfunction Indoor Display E14 Indoor DC fan motor malfunction Method of Malfunction Detection When the fan motor is running, the speed detected by the Hall IC is used to judge the abnormal operation of the fan motor Malfunction Decision Conditions Supposed Causes Trouble shooting When the detected rotation feedback signal don’t received in 2 minutes ■ Operation halt due to breaking of wire inside the fan motor. ■ Operation halt due to breaking of the fan motor lead wires ■ Detection error due to faulty indoor unit PCB * Caution: Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred. NO Check whether Terminals on indoor PCB is well? Pull out the terminals on the indoor mainboard and reinsert them. YES . Electrify the machine again and turn it on in the cooling operation. Measure voltage between the positions 1and 4 of Terminal CN9 on the indoor PCB NO The voltage is about 310VDC The indoor PCB is damaged and need replace YES 32 7 6 5 4 3 2 1 Service Diagnosis Turn on the unit and check if the motor can run Measure whether there is a voltage pulse (0-15VDC) between 4 and 5 of the CN9 terminal on the indoor PCB YES NO The indoor motor is damaged and need replace NO YES Is it ok? The indoor PCB is damaged and need replace 33 Service Diagnosis 10.4.4 Outdoor DC fan motor fault Outdoor display Method of F8 LED1 flash 9 times DC fan motor is detected by checking the fan running condition and so on Detection Malfunction Decision Conditions When the detected rotation feedback signal don’t received i n2 minutes Supposed Causes ■ DC fan motor protection dues to the DC fan motor faulty ■ DC fan motor protection dues to faulty PCB Trouble shooting * Caution: Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred. Check whether terminal on the outdoor mainboard is well inserted. NO It is normal Reinsert the terminal YES Electrify the machine again and turn it on in the cooling state with the remote control. Check whether the motor could run. NO Remove fan motor after switch off the power. Measure the resistances between black line and red line, between black line and white line of the fan motor 34 YES The motor and outdoor PCB are well Service Diagnosis YES The resistances are more than 40kΩ NO The motor of the outdoor unit is damaged and needs replacing. The resistances between black line and red line, between black line and white line of the fan terminal of outdoor PCB are greater than 10MΩ NO The outdoor PCB is damaged. Replace it with a new one. 35 YES The module PCB is damaged, replace it with a new one. Service Diagnosis 10.4.5 Outdoor display: Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes Trouble shooting IPM protection F1 LED1 flash 2 times IPM protection is detected by checking the compressor running condition and so on The system leads to IPM protection due to over current The compressor faulty leads to IPM protection Circuit component of IPM is broken and led to IPM protection ■ IPM protection dues to the compressor faulty ■ IPM protection dues to faulty PCB of IPM module ■ Compressor wiring disconnected * Caution: Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred Electrify the machine again and turn it on with the remote control. If malfunctions are reported before or upon the compressor being started up. NO The compressor is started normally, but malfunctions are reported after it has run for some time YES Test IPM module resistance between P and U,V,W . Then test IPM module resistance between N and U,V,W. The resistance ranges between 1MΩ and 10MΩ and they are similar. NO The outdoor PCB is damaged. Replace it with a new one. 1. The system may have been over (like, capillary clogging or electronic expansion valve faulty) or under charged with gas, which can be judged through the pressure of the measuring system. 2. The shaft of compressor is seized and the compressor needs replacing. 36 N W V U P Service Diagnosis 10.4.6 Over-current of the compressor Outdoor Display Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes Trouble shooting F22, F2, F23 LED1 flash 3 or 24 or 25 times The current of the compressor is too high When the IPM Module is damaged or the compressor is damaged. Power supply voltage is too low or too high ■ Faulty IPM Module ■ Faulty compressor ■ Faulty power supply * Caution: Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Electrify the machine again and turn it on with the remote control. If malfunctions YES are reported before or upon the compressor being started up, IPM Module is damaged and needs replace. NO The compressor is started normally, but malfunctions are reported after it has run YES for some time. Check the power supply is too low or too high NO The system may have been over or under charged with gas, which can be judged through the pressure of the measuring system. 37 Repair the power supply Service Diagnosis 10.4.7 The communication fault between IPM and outdoor PCB Outdoor display: F3 LED1 flash 4 times Method of Malfunction Communication is detected by checking the IPM module and the outdoor PCB Detection Malfunction Decision Conditions Supposed Causes Trouble shooting ■ The outdoor PCB broken leads to communication fault ■ The IPM module broken leads to communication fault ■ The outdoor PCB is broken ■ The IPM module is broken ■ Communication wiring disconnected * Caution: Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred. Check whether the CN23 and CN24 terminals of the outdoor PCB and the CN10 and CN11 terminals of the IPM module are tightly connected. Check whether the connection between the power module and the outdoor P&N line is tight Are they good? NO Pull out and reinsert the terminals. Replace connected wire Malfunction unsolved Electrify the machine again and turn it on. Check whether the voltage between 1 and 2 of Terminal CN23 is about DC5V. Check whether the voltage between2 and 3 of terminal CN23 is about DC15V. YES Replace the outdoor IPM module with a new one. NO Replace the outdoor PCB with a new one 1 2 3 38 Service Diagnosis 10.4.8 Power Supply Over or under voltage fault Outdoor display: F19 LED1 flash 6 times An abnormal voltage rise or fall is detected by checking the specified voltage detection circuit. Method of The power supply is over voltage Malfunction Detection Malfunction Decision Conditions Supposed Causes Trouble shooting The voltage signal is fed from the voltage detection circuit to the microcomputer Supply voltage not as specified the IPM module is broken the outdoor PCB is broken * Caution: Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred. Electrify the machine again and turn it on with the remote control. Check whether the compressor is started normally Is it ok? YES Maybe there is some disturbance NO Test the outdoor power supply (+310VDC) with a universal meter. Check whether the power is >150 V or <390V? YES Change the IPM module 310 NO Check whether the outdoor Power supply is ok (L and N AC 230V)? YES Change the IPM module NO 230 This question may be caused by the power. Repair the power supply. 39 V AC V DC Service Diagnosis 10.4.9 Overheat Protection for Discharge Temperature Outdoor display: F4 LED1 flash 8 times Method of Malfunction Detection Check the control of the discharge temperature by the temperature detected by the discharge pipe thermistor Malfunction Decision Conditions When the compressor discharge temperature is above 110℃ Supposed Causes Trouble shooting ■ Electronic expansion valve defective ■ Faulty thermistor ■ Faulty PCB * Caution: Be sure to turn off power switch before connect or disconnect connector or else parts damage may be occurred. Electrify the machine again and turn it on with the remote control, then measure the temperature at the exhaust temperature sensor of the compressor on the outdoor unit The temperature exceeds 110 ℃ shortly after the machine starts up? YES The cryogen may have been leaked during installation, or there may be leakage in the piping system. There may be other causes to make the exhaust temperature too high. NO Malfunctions occur after running for some time even though the measured temperature is below 110℃. Pull out the exhaust sensor and measure its resistance at standard temperatures according to the resistancetemperature table YES The results deviate much? NO The outdoor mainboard is damaged and needs be replaced 40 The sensor is damaged. Replace the sensor with a new one. Service Diagnosis 10.4.10 The communication fault between indoor and outdoor Split board Indoor display E7 outdoor display LED1 flash 15 times Method of Malfunction Detection Communication is detected by checking the indoor PCB and the outdoor PCB. Malfunction Decision Conditions The outdoor PCB broken leads to communication fault. The indoor PCB broken leads to communication fault. Supposed Causes Trouble shooting Communication wiring disconnected. The indoor PCB is broken. The outdoor PCB is broken. The Power Module is broken. * Caution: Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred. Is it normal after restart the AC? YES The outdoor PCB needs dehumidification NO If starting up normally, but malfunction occurs again after a while NO The outdoor PCB needs dust YES Check whether the linking cable between the indoor and outdoor is well connected or whether its core wires are well insulated or its L/N is not reversed. NO Reconnect the connecting cable or replace with a new one. YES 41 Service Diagnosis Check the indoor PCB: only indoor charged measure the voltage between 3 and 4 of IC6 on the indoor PCB with a universal meter. And measure the voltage between CN23(S) and CN17 (L) with a universal meter. If the voltage is a constant value from DC 0V to DC 5V.Or the voltage between communication line (red) and N (white line) is not close to18V DC when only indoor charged. YES The indoor PCB is damaged; replace it with a new one. NO Check the cable between outdoor and power NO The module PCB is damaged. Replace it with a new one. NO Test the outdoor power is supply 230VAC with a universal meter when indoor and outdoor are charged. YES LED2 light of the outdoor YES YES LED 1 light Measure the voltage between 3 and 4 of IC9 on the Outdoor mainboard with a universal meter .The voltage is a constant value of 0V DC to 5V DC YES The outdoor PCB is damaged. Replace it with a new one. NO Outdoor PCB is ok then check cable. 42 Service Diagnosis NO Remove fan motor after switch off the power and restart the unit, the LED 1 becomes light or flash. NO YES Fan motor is damaged. And replace it with a new one. NO Test the fan motor terminal resistance between pin 1(310V) and pin 4(0V), or pin 5(15V) and pin 4(0V) of CN21 are close to 0mΩ with a universal meter after switch off the power. YES Remove the connection cable between CN23 of outdoor PCB and CN10 of module PCB. The LED1 becomes light or flash. YES NO The module PCB is damaged, replace it with a new one. The outdoor PCB is damaged. Replace it with a new one. 43 Service Diagnosis All-in-one board Indoor display Method of Malfunction Detection E7 outdoor display LED2 flash 15 times Communication is detected by checking the indoor PCB and the outdoor PCB. Malfunction Decision Conditions The outdoor PCB broken leads to communication fault. The indoor PCB broken leads to communication fault. Supposed Causes Communication wiring disconnected. The indoor PCB is broken. The outdoor PCB is broken. * Caution: Be sure to turn off power switch before connect or disconnect connector, or else parts damage may be occurred. Trouble shooting Is it normal after restart the AC? YES The outdoor PCB needs dehumidification NO If starting up normally, but malfunction occurs again after a while NO The outdoor PCB needs dust YES Check whether the linking cable between the indoor and outdoor is well connected or whether its core Reconnect the connecting cable or replace with a new one. NO wires are well insulated or its L/N is not reversed. YES 44 Service Diagnosis Check the indoor PCB: Only indoor charged measure the voltage between 3 and 4 of IC6 on the indoor mainboard with a universal meter. And measure the voltage between CN23(S) and CN52 (L) with a universal meter. If the voltage is a constant value of 0V DC to 5V DC .Or the voltage between communication line (red) and N (white line) is not close to18V DC when only indoor charged. YES The indoor PCB is damaged; replace it with a new one. NO Test the outdoor power is supply 230VAC with a universal meter when indoor and outdoor are charged. Check the cable between outdoor and power NO YES LED2 light YES Measure the voltage Between 3 and 4 of IC5 on the Outdoor mainboard with a universal meter. The voltage is a constant value of 0V DC to 5V DC YES NO NO The outdoor PCB is well, and then check the cable 45 The outdoor PCB is damaged. Replace it with a new one. Service Diagnosis Remove fan motor after switch off the power and restart the unit, the LED 2 becomes light or flash. YES Fan motor is damaged. Replace it with a new one. NO NO Test the fan motor terminal resistance between pin 1 (310V) and pin 4 (0V), or pin5 (15V) and pin4 (0V) of CN21 are close to 0mΩ with a universal meter after switch off the power. 46 Service Diagnosis 10.4.11 Loss of synchronism detection (Compressor position detection circuit fault) Outdoor Display Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes Trouble shooting F11 LED1 flash 18 times F28 LED1 flash 19 times The position of the compressor rotor can’t detected normally When the wiring of compressor is wrong or the connection is poor; Or the compressor is damaged ■ Faulty The wiring of compressor ■ Faulty compressor ■ Faulty PCB * Caution: Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Within 3 minutes after the machine is supplied with power and turned on with the remote control, check whether the compressor can start up NO The wiring of compressor is incorrect or the connection is poor; The compressor is damaged YES At first, the compressor start up, soon the compressor stopped with the LED1 on the outdoor PCB blinks (1Hz) 19/18 times YES IPM module is damaged and needs replace. Malfunction unsolved Maybe there is some disturbance 47 Malfunctions exist also, the compressor is damaged replace a new one Service Diagnosis 10.4.12 High work-intense protection Outdoor display Method of Malfunction Detection Malfunction Decision Conditions Supposed Causes Trouble shooting E 9 LED1 flash 21 times High work-intense control is activated in the heating mode if the temperature being sensed by the heat exchanger thermistor exceeds the limit. Activated when the temperature being sensed by the heat exchanger rises above 65℃ twice in 30 minutes ■ ■ ■ ■ Faulty electronic expansion valve Dirty heat exchanger Faulty heat-exchange sensor Insufficient gas * Caution: Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred. Electrify the machine again and turn it on with the remote control, check whether the wind temperature is below 65℃ YES The malfunction is reported after the machine has run for some time? Check room temperature and pipe temperature sensor. Monitor the temperature of indoor PCB circuits. NO The indoor unit blows poorly due to blocked filters or poor condition of the fan? YES NO Use some tools to measure the pressure of system 48 Clean the filters Reinstall the fan. Circuit Diagra ams 11 Circcuit Diag grams 49 Doomestic air conditionerr Circuit Diagra ams 50 Doomestic air conditionerr Removal Procedure 12.Removal Procedure Removal of front panel Indoor unit Step Procedure Points 1.Features 2.Remove the front panel 1 Hold the front panel by the tabs on the both sides and lift it 51 Domestic air conditioner Removal Procedure Step 2 3 Procedure Loosen the screw and lift up the casing cover Points Loosen the screw Loosen the screw and lift up the control box cover Loosen the screw 52 Domestic air conditioner Removal Procedure Remove the air filters and horizontal flap Step 6 Procedure Points Pull the Harness out of the control box and then release the pivots on both sides of the unit to remove the front panel Remove the air filters 1 Lift an air filter upwards slightly and then pull it out downwards Remove the horizontal flap ■ The horizontal flap is Single 1 Release the side of pivot and then Release the Center of the pivot. Bend the horizontal blade slightly and remove it. 53 Domestic air conditioner Removal Procedure Remove the casing Step Procedure 1 Release the screw covers(3EA) 2 Loosen the marked Screw (7EA) 54 Points Domestic air conditioner Removal Procedure Step Procedure Points Holes（4EA） 3 ■When assembling, install the front grille horizontally so as not to stuff the flap inside. ■When assembling, make sure the four hooks are caught properly. Release the marked hooks (4EA) and then Pull the front grille out Horizontally and remove it HOOK（4EA） 55 Domestic air conditioner Removal Procedure Release stepping motor and control box Step Procedure Points Hooks (3EA) 1 2 Release the top cover of the control box hooks and then remove it. Pull the Harness out of the PCB unit and then Loosen the control Box screws (2EA) . Pull the control box from of the frame and remove it. Loosen screws (2EA) Harness: Stepping motor and fan motor harness 56 Domestic air conditioner Removal Procedure Release stepping motor and control box Step 3 Procedure Points Loosen the stepping motor screws (2EA), and then Release the stepping motor 57 Domestic air conditioner Removal Procedure Removal of Heat Exchanger Step 1 Procedure Points Loosen the marked screws(2EA) Loosen the Screws (2EA) 2 Pull mounting plate and heat exchanger bracket out from Hook of the base frame and then release them. 58 Domestic air conditioner Removal Procedure Step 3 Procedure Points Release the fixture plate from the base frame hook and remove it. 59 Domestic air conditioner Removal Procedure Step 4 Procedure Points Loosen the marked screws (7EA). And then Remove the heat exchanger Remove Fan Motor 1 Loosen the marked screws(4EA) and release the cover of fan motor 60 Domestic air conditioner Removal Procedure Step 1 Procedure Points Loosen the marked screw (2EA) of fan motor up bracket and remove it Screw of fan rotor Screw of Fan Motor up bracket 2 Loosen the marked screw (1EA) of fan motor and remove fan motor ove it Fan motor bracket(UP) Fan motor assy 61 Domestic air conditioner Removal Procedure Step 3 Procedure Points Lift up the right part of the fan and remove it Remove horizontal louver and fan motor bracket 1 Every blade go round and round, then move it 62 Domestic air conditioner Removal Procedure Remove fan motor bracket and fan bearing Step Procedure 1 Pull the hook of fan motor bracket and upward remove it 2 Pull the hook of bearing bracket and upward remove it 63 Points Domestic air conditioner Removal Procedure Remove frame work board Step 1 Procedure Points Loosen the marked screw of frame work board Screw of frame work board 2 Pull the hook of frame work board, remove it 64 Domestic air conditioner Removal Procedure Remove drain pipe and drain pipe stem Step Procedure 1 Loosen the marked screw of drain pipe and then remove it 2 Pull the drain pipe stem from base frame and the remove it 65 Points Domestic air conditioner Generalny Dystrybutor Systemów Klimatyzacji i Pomp Ciepła HEIKO REFSYSTEM Sp. z o. o. ul. Metalowców 5 86-300 Grudziądz +48 723 737 378 www.heiko.pl ">
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