Mitsubishi Electric | MUZ-FD25VA-E1 | Service manual | Mitsubishi Electric MUZ-FD25VA-E1 Service manual

Mitsubishi Electric MUZ-FD25VA-E1 Service manual
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Revision B:
• MSZ-GE42/50VA -
E1
has been added.
Please void OBH515 REVISED EDITION-A.
SPLIT-TYPE AIR CONDITIONERS
INDOOR UNIT
SERVICE MANUAL
No. OBH515
REVISED EDITION-B
Models
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA -
E1
E1
E1
E1
E1
Outdoor unit service manual
MUZ-GE·VA Series (OBH516)
MXZ-A·VA Series (OB377)
MXZ-8A140A (OC316)
CONTENTS
1. TECHNICAL CHANGES ··································· 3
2. PART NAMES AND FUNCTIONS ····················· 4
3. SPECIFICATION ················································ 5
4. NOISE CRITERIA CURVES ······························ 6
5. OUTLINES AND DIMENSIONS ························ 7
6. WIRING DIAGRAM············································ 8
7. REFRIGERANT SYSTEM DIAGRAM ··············· 9
8. SERVICE FUNCTIONS ··································· 10
9. MICROPROCESSOR CONTROL ··················· 12
10. TROUBLESHOOTING ····································· 18
11. DISASSEMBLY INSTRUCTIONS ···················· 32
PARTS CATALOG (OBB515)
NOTE:
RoHS compliant products have <G> mark on the spec name plate.
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Revision A:
• 11. DISASSEMBLY INSTRUCTIONS has been corrected.
11-6. Photo 9 has been changed.
Revision B:
• MSZ-GE42/50VA -
E1
has been added.
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1
TECHNICAL CHANGES
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA -
E1
E1
E1
E1
E1
1. New model.
3
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2
PART NAMES AND FUNCTIONS
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA
Air filter
(Catechin air filter)
Front panel
Air cleaning filter
(Anti-Allergy Enzyme
Filter, option)
Air inlet
Heat exchanger
Air outlet
Fan guard
Fan
Horizontal vane
Remote controller
Vertical vane
Remote control receiving section
Operation indicator lamp
Emergency operation switch (E.O. SW)
ACCESSORIES
Installation plate
Installation plate fixing screw 4 × 25 mm
Remote controller holder
Fixing screw for 3.5 × 1.6 mm (Black)
Battery (AAA) for remote controller
Wireless remote controller
Felt tape (Used for left or left-rear piping)
1
5
1
2
2
1
1
4
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3
SPECIFICATION
MSZ-GE22VA
W
A
A
Cooling
m /h
Heating
m /h
Cooling
dB(A)
Heating
dB(A)
Cooling
mm
kg
rpm
Heating
Fan
motor
Electrical
data
Indoor model
Power supply
Cooling
Power
input 1
Heating
Cooling
Running
current 1 Heating
Model
Cooling
Current
1
Heating
Dimensions W × H × D
Weight
Air direction
Super High
High
Med.
Low
Silent
Super High
High
Med.
Low
Silent
Super High
High
Med.
Low
Silent
Super High
High
Med.
Low
Silent
Super High
High
Med.
Low
Silent
Super High
High
Med.
Low
Silent
Fan speed regulator
Remote controller model
rpm
Sound level
Fan speed
Special remarks
Airflow
3
3
MSZ-GE25VA
MSZ-GE35VA
MSZ-GE42VA
Single phase 230 V, 50 Hz
22
29
23
30
0.22
0.29
0.23
0.31
RC0J40-FK
0.22
0.29
0.23
0.31
798 × 295 × 232
10
5
762
768
678
624
546 (552 2)
516
402
402 (414 2)
408
288 (276 2)
288
348
246
690
786
546
624
396
402
516
288 (276 2)
288
420
246
348
43
46
42
40
36
30
35
29
22
30
21
26
19
42
46
36
40
29
30
35
21
22
30
19
26
1,020
1,120
1,120
860
950
810
670
670 (690 2)
530
680
470
600
1,040
1,140
860 (700 2)
950 (930 2)
810
670 (610 2)
530
690
470
600
5
KM09A
NOTE: Test conditions are based on ISO 5151.
Cooling: Indoor
Dry-bulb temperature 27°C
Outdoor Dry-bulb temperature 35°C
Heating: Indoor
Dry-bulb temperature 20°C
Outdoor Dry-bulb temperature 7°C
1 Measured under rated operating frequency.
2 For multi system.
Wet-bulb temperature
19°C
Wet-bulb temperature
6°C
Specifications and rating conditions of main electric parts
Fuse
Horizontal vane motor
Varistor
Terminal block
T3.15AL250V
12 VDC
S10K300E3K1 (ERZV14D471)
3P
(F11)
(MV)
(NR11)
(TB)
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MSZ-GE50VA
43
39
0.39
0.36
0.39
0.36
906
714
576
468
390
870
732
576
468
390
49
44
38
33
28
48
43
37
33
28
1,280
1,060
890
750
650 (690 2)
1,240
1,080 (930 2)
890 (840 2)
750
650
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NOISE CRITERIA CURVES
MSZ-GE35VA
MSZ-GE22VA MSZ-GE25VA
FAN SPEED FUNCTION
Super High
SPL(dB(A))
COOLING
42
HEATING
42
LINE
FAN SPEED FUNCTION
Super High
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
NC-20
NC-10
10
63
125
250
500
1000
2000
4000
42
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
NC-20
NC-10
10
8000
63
125
250
500
1000
2000
4000
8000
BAND CENTER FREQUENCIES, Hz
MSZ-GE50VA
MSZ-GE42VA
FAN SPEED FUNCTION
Super High
SPL(dB(A))
COOLING
46
HEATING
46
LINE
FAN SPEED FUNCTION
Super High
90
SPL(dB(A))
COOLING
49
HEATING
48
LINE
90
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
HEATING
LINE
80
BAND CENTER FREQUENCIES, Hz
80
70
NC-70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
NC-20
NC-10
10
43
90
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
OCTAVE BAND SOUND PRESSURE LEVEL, dB re 0.0002 MICRO BAR
90
SPL(dB(A))
COOLING
63
125
250
500
1000
2000
4000
80
70
60
NC-60
50
NC-50
40
NC-40
30
NC-30
20
BAND CENTER FREQUENCIES, Hz
Test conditions
Cooling: Dry-bulb temperature 27°C
Wet-bulb temperature 19°C
Heating: Dry-bulb temperature 20°C
NC-20
NC-10
10
8000
NC-70
63
125
250
500
1000
2000
4000
BAND CENTER FREQUENCIES, Hz
INDOOR UNIT
WALL
1m
0.8m
MICROPHONE
6
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8000
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OUTLINES AND DIMENSIONS
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA
11×20 Oblong hole
225
225
80
21.5
11×26 Oblong hole
80
Installation plate
798
785
Unit: mm
155
338
315
84
Air in
232
5
Wall hole ø65
Indoor unit
Installation plate
50
619
130
107
19
42
Air out
Piping
43
58
56
Insulation
Liquid line
Gas line
50
Drain hose
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56
69
8
100
56
42
45
159
69
295
Piping
Drain hose
112
ø35 O.D
ø6.35 - 0.5 m (Flared connection ø6.35)
ø9.52 - 0.43 m
(Flared connection: ø9.52 (22/25/35/42), ø12.7 (50))
Insulation ø28 O.D Connected part ø16 O.D
253
211.5
61
3
42
212.5
155
41
254
6.5
231.5
5
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WIRING DIAGRAM
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA
MSZ-GE42VA MSZ-GE50VA
8
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REFRIGERANT SYSTEM DIAGRAM
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA
Refrigerant pipe ø9.52 (GE22/25/35/42)
ø12.7 (GE50)
(with heat insulator)
Indoor
heat
exchanger
Indoor coil
thermistor
RT12 (main)
Flared connection
Indoor coil
thermistor
RT13 (sub)
Room temperature
thermistor
RT11
Flared connection
Refrigerant pipe ø6.35
(with heat insulator)
Refrigerant flow in cooling
Refrigerant flow in heating
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Unit: mm
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SERVICE FUNCTIONS
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA
8-1. TIMER SHORT MODE
For service, set time can be shortened by short circuit of JPG and JPS on the electronic control P.C. board.
The time will be shortened as follows. (Refer to 10-7.2.)
Set time: 1 minute → 1 second
Set time: 3 minutes → 3 seconds (It takes 3 minutes for the compressor to start operation. However, the starting time is
shortened by short circuit-of JPG and JPS.)
8-2. P.C. BOARD MODIFICATION FOR INDIVIDUAL OPERATION
A maximum of 4 indoor units with wireless remote controllers can be used in a room.
In this case, to operate each indoor unit individually by each remote controller, P.C. boards of remote controller must be
modified according to the number of the indoor unit.
How to modify the remote controller P.C. board
Remove batteries before modification.
The board has a print as shown below:
J1
NOTE: For modification, take out
the batteries and press
the OPERATE/STOP (ON/
OFF) button twice or 3
times at first.
After modification, put back
the batteries then press the
RESET button.
J2
The P.C. board has the print “J1” and “J2”. Solder “J1” and “J2” according to the number of indoor unit as shown in Table 1.
After modification, press the RESET button.
Table 1
1 unit operation
2 units operation
3 units operation
4 units operation
No. 1 unit
No modification
Same as at left
Same as at left
Same as at left
No. 2 unit
—
Solder J1
Same as at left
Same as at left
No. 3 unit
—
—
Solder J2
Same as at left
No. 4 unit
—
—
—
Solder both J1 and J2
How to set the remote controller exclusively for particular indoor unit
After you turn the breaker ON, the first remote controller that sends the signal to the indoor unit will be regarded as the remote
controller for the indoor unit.
The indoor unit will only accept the signal from the remote controller that has been assigned to the indoor unit once they are
set.
The setting will be cancelled if the breaker is turned OFF, or the power supply is shut down.
Please conduct the above setting once again after the power has restored.
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8-3. AUTO RESTART FUNCTION
When the indoor unit is controlled with the remote controller, the operation mode, the set temperature, and the fan speed
are memorized by the indoor electronic control P.C. board. “AUTO RESTART FUNCTION” automatically starts operation
in the same mode just before the shutoff of the main power.
Operation
If the main power has been cut, the operation settings remain.
After the power is restored, the unit restarts automatically according to the memory.
(However, it takes at least 3 minutes for the compressor to start running.)
How to release “AUTO RESTART FUNCTION”
CN10A
CN151
Indoor electronic
control P.C. board
CN112 CN111
Turn off the main power for the unit.
Solder the jumper wire to JR07 on the indoor electronic control P.C. board. (Refer to 10-7.2.)
JR07
NOTE:
• The operation settings are memorized when 10 seconds have passed after the indoor unit was operated with the remote
controller.
• If main power is turned OFF or a power failure occurs while AUTO START/STOP timer is active, the timer setting is cancelled.
• If the unit has been off with the remote controller before power failure, the auto restart function does not work as the
power button of the remote controller is OFF.
• To prevent breaker OFF due to the rush of starting current, systematize other home appliance not to turn ON at the same
time.
• When some air conditioners are connected to the same supply system, if they are operated before power failure, the
starting current of all the compressors may flow simultaneously at restart.
Therefore, the special counter-measures are required to prevent the main voltage-drop or the rush of the starting current
by adding to the system that allows the units to start one by one.
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MICROPROCESSOR CONTROL
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA
WIRELESS REMOTE CONTROLLER
Signal transmitting section
Operation display section
OPERATE/STOP
(ON/OFF) button
FAN SPEED CONTROL button
OFF TIMER button
OPERATION SELECT button
Temperature buttons
ECONO COOL button
ON TIMER button
VANE CONTROL button
TIME SET buttons
FORWARD button
BACKWARD button
i save button
CLOCK SET button
RESET button
Indication of
remote controller
model is on back
NOTE: Last setting will be stored after the unit is turned OFF with the remote controller. Indoor unit receives the signal of the
remote controller with beeps.
INDOOR UNIT DISPLAY SECTION
Operation Indicator lamp
The operation indicator at the right side of the indoor unit indicates the operation state.
•The following indication applies regardless of shape of the indication.
Indication
Operation state
Room temperature
Lighted
Blinking
Not lighted
The unit is operating to
reach the set temperature
About 2°C or more away
from set temperature
The room temperature is
approaching the set temperature
About 1 to 2°C from set
temperature
Standby mode
(Only during multi system
operation)
-
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9-1. COOL ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select COOL mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range
is 16 - 31°C.
1. Coil frost prevention
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the coil
from frosting.
When the temperature of indoor heat exchanger becomes too low, the coil frost prevention mode works.
The indoor fan operates at the set speed and the compressor stops. This mode continues until the temperature of indoor
heat exchanger rises.
2. Low outside temperature operation
When the outside temperature is lower, low outside temperature operation starts, and the outdoor fan slows or stops.
9-2. DRY ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select DRY mode with OPERATION SELECT button.
(3) The set temperature is determined from the initial room temperature.
1. Coil frost prevention
Coil frost prevention is as same as COOL mode. (9-1.1.)
2. Low outside temperature operation
Low outside temperature operation is as same as COOL mode. (9-1.2.)
9-3. HEAT ( ) OPERATION
(1) Press OPERATE/STOP (ON/OFF) button.
OPERATION INDICATOR lamp of the indoor unit turns on with a beep tone.
(2) Select HEAT mode with OPERATION SELECT button.
(3) Press TEMPERATURE buttons (TOO WARM or TOO COOL button) to select the desired temperature. The setting range
is 16 - 31°C.
1. Cold air prevention control
When the compressor is not operating or is starting, and the temperature of indoor heat exchanger and/or the room temperature is low or when defrosting is being done, the indoor fan will stop or rotate in Very Low speed.
2. High pressure protection
The compressor operational frequency is controlled by the temperature of the indoor heat exchanger to prevent the condensing pressure from increasing excessively.
When the temperature of indoor heat exchanger becomes too high, the high pressure protection works.
The indoor fan operates following the cold air prevention control. This mode continues until the temperature of indoor
heat exchanger falls.
3. Defrosting
Defrosting starts when the temperature of outdoor heat exchanger becomes too low.
The compressor stops once, the indoor/outdoor fans stop, the 4-way valve reverses, and the compressor re-starts.
This mode continues until the temperature of outdoor heat exchanger rises or the fixed time passes.
9-4. AUTO CHANGE OVER ··· AUTO MODE OPERATION
Once desired temperature is set, unit operation is switched automatically between COOL and HEAT operation.
Mode selection
(1) Initial mode
When unit starts the operation with AUTO operation from OFF:
• If the room temperature is higher than the set temperature, operation starts in COOL mode.
• If the room temperature is equal to or lower than the set temperature, operation starts in HEAT mode.
(2) Mode change
COOL mode changes to HEAT mode when about 15 minutes have passed with the room temperature 1°C below the
set temperature.
HEAT mode changes to COOL mode when about 15 minutes have passed with the room temperature 1°C above the
set temperature.
NOTE 1
If two or more indoor units are operating in multi system, there might be a case that the indoor unit, which is operating in
(AUTO), cannot change over to the other operating mode (COOL ↔ HEAT) and becomes a state of standby.
Refer to NOTE 2 “FOR MULTI SYSTEM AIR CONDITIONER”.
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NOTE 2
FOR MULTI SYSTEM AIR CONDITIONER
OUTDOOR UNIT: MXZ series
Multi system air conditioner can connect two or more indoor units with one outdoor unit.
• When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and
the others for heating, the operation mode of the indoor unit that operates earlier is selected. Other indoor units
cannot operate, and operation indicator lamp flashes as shown in the figure below. In this case, please set all the
indoor units to the same operation mode.
OPERATION INDICATOR
Lighted
Blinking
Not lighted
• When indoor unit starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max.
10 minutes) to blow out the warm air.
• In the heating operation, though indoor unit that does not operate may get warm or the sound of refrigerant flowing may be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
9-5. AUTO VANE OPERATION
1. Horizontal vane
(1) Vane motor drive
These models are equipped with a stepping motor for the horizontal vane. The rotating direction, speed, and angle of
the motor are controlled by pulse signals (approx. 12 V) transmitted from indoor microprocessor.
(2) The horizontal vane angle and mode change as follows by pressing VANE CONTROL button.
AUTO
→ 1
→ 2
→ 3
→ 4
→
5
→ SWING
(3) Positioning
To confirm the standard position, the vane moves until it touches the vane stopper. Then the vane is set to the
selected angle.
Confirming of standard position is performed in the following cases:
(a) When the operation starts or finishes (including timer operation).
(b) When the test run starts.
(c) When standby mode (only during multi system operation) starts or finishes.
(4) VANE AUTO ( ) mode
In VANE AUTO mode, the microprocessor automatically determines the vane angle to make the optimum room temperature distribution.
In COOL and DRY operation
Vane angle is fixed to Horizontal position.
In HEAT operation
Vane angle is fixed to Angle 5.
Horizontal
position
5
(5) STOP (operation OFF) and ON TIMER standby
In the following cases, the horizontal vane returns to the closed position.
(a) When OPERATE/STOP (ON/OFF) button is pressed (POWER OFF).
(b) When the operation is stopped by the emergency operation.
(c) When ON TIMER is ON standby.
(6) Dew prevention
During COOL or DRY operation with the vane angle at Angle 4 or 5 when the compressor cumulative operation time
exceeds 1 hour, the vane angle automatically changes to Angle 1 for dew prevention.
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(7) SWING ( ) mode
By selecting SWING mode with VANE CONTROL button, the horizontal vane swings vertically.
(8) Cold air prevention in HEAT operation
The horizontal vane position is set to Upward.
NOTE: When 2 or more indoor units are operated with multi outdoor unit, even if any indoor unit turns thermostat off,
this control doesn’t work in the indoor unit.
(9) To change the airflow direction not to blow directly onto your body.
To change the airflow
direction
Pressing and holding VANE CONTROL
button for 2 seconds
or more, the horizontal vane reverses and
moves horizontal position.
Horizontal
position
When to use this function?
Use this function if you
don’t want the air from the
indoor unit to blow directly
onto your body.
• Depending on the shape
of the room, the air may
blow directly onto your
body.
• Press VANE CONTROL
button again to return the
vane to the previously-set
position.
COOL/DRY
HEAT
The air conditioner starts
the cooling or drying operation approx. 3 minutes after
the vane has moved to the
horizontal position.
• When VANE CONTROL
button is pressed again,
the vane returns to the
previously-set position
and the air conditioner
starts the cool or dry
operation in approx. 3
minutes.
The air conditioner starts
heating operation approx. 3
minutes after the vane has
moved to the horizontal
position.
• Sometimes the area
around your feet may
not warm. To warm the
area around the feet, set
the horizontal vane to
(AUTO) or the downwardblowing position.
• When VANE CONTROL
button is pressed again,
the vane returns to the
previously-set position
and the air conditioner
starts the heat operation
in approx. 3 minutes.
NOTE:
• If you make the airflow not to blow directly onto your body by pressing VANE CONTROL button, the compressor
stops for 3 minutes even during the operation of the air conditioner.
• The air conditioner operates with Very Low speed until the compressor turns on again.
(10) ECONO COOL ( ) operation (ECONOmical operation)
When ECONO COOL button is pressed in COOL mode, set temperature is automatically set 2°C higher.
Also the horizontal vane swings in various cycle.
SWING operation makes you feel cooler than set temperature. So, even though the set temperature is higher, the
air conditioner can keep comfort. As a result, energy can be saved.
ECONO COOL operation is cancelled when ECONO COOL button is pressed once again or VANE CONTROL button is pressed or changed to other operation mode.
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9-6. TIMER OPERATION
1. How to set the time
(1) Check that the current time is set correctly.
NOTE: Timer operation will not work without setting the current time. Initially “0:00” blinks at the current time display
of TIME MONITOR, so set the current time correctly with CLOCK SET button.
How to set the current time
(a) Press the CLOCK set button.
(b) Press the TIME SET buttons (
and
) to set the current time.
• Each time FORWARD button (
) is pressed, the set time increases by 1 minute, and each time BACKWARD
button (
) is pressed, the set time decreases by 1 minute.
• Pressing those buttons longer, the set time increases/decreases by 10 minutes.
(c) Press the CLOCK set button.
(2) Press OPERATE/STOP (ON/OFF) button to start the air conditioner.
(3) Set the time of timer.
ON timer setting
) during operation.
(a) Press ON TIMER button(
(b) Set the time of the timer using TIME SET buttons (
and
).
OFF timer setting
) during operation.
(a) Press OFF TIMER button (
(b) Set the time of the timer using TIME SET buttons (
and
).
Each time FORWARD button (
) is pressed, the set time increases by 10 minutes: each time BACKWARD button (
) is pressed, the set time decreases by 10 minutes.
2. To release the timer
To release ON timer, press ON TIMER button (
).
To release OFF timer, press OFF TIMER button(
).
TIMER is cancelled and the display of set time disappears.
PROGRAM TIMER
• OFF timer and ON timer can be used in combination. The timer of the set time that is reached first will operate first.
• “ ” and “ ” display shows the order of OFF timer and ON timer operation.
(Example 1) The current time is 8:00 PM.
(Example 2) The current time is 11:00 AM.
The unit turns off at 11:00 PM, and on at 6:00 AM.
The unit turns on at 5:00 PM, and off at 9:00 PM.
NOTE: If the main power is turned off or a power failure occurs while ON/OFF timer is active, the timer setting is cancelled.
As these models are equipped with an auto restart function, the air conditioner starts operating with timer cancelled
when power is restored
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9-7. i-save ( ) OPERATION
1. How to set i-save operation
(1) Press OPERATE/STOP (ON/OFF) button.
(2) Select COOL, HEAT or ECONO COOL mode.
(3) Press i-save button.
(4) Set the temperature, fan speed, and airflow direction for i-save operation.
NOTE:
• i-save operation cannot be selected during DRY or AUTO mode operation.
• The setting range of HEAT mode i-save operation is 10°C and 16 - 31°C.
• 2 groups of setting can be saved. (One for COOL/ECONO COOL, one for HEAT)
2. How to cancel operation
• Press i-save button again.
• i-save operation can also be cancelled by pressing OPERATION SELECT button to change the operation mode.
The same setting is select from the next time by simply pressing i-save button.
9-8. EMERGENCY/TEST OPERATION
In case of test run operation or emergency operation, use
EMERGENCY OPERATION switch on the right side of the indoor unit.
Emergency operation is available when the remote controller is missing, has failed or the batteries of the remote controller run down. The
unit will start and OPERATION INDICATOR lamp will light.
The first 30 minutes of operation is the test run operation. This operation is for servicing. The indoor fan runs at High speed and the system
is in continuous operation (The thermostat does not work).
After 30 minutes of test run operation, the system shifts to
EMERGENCY COOL/HEAT MODE with a set temperature of 24°C.
The fan speed shifts to Med.
In the test run or emergency operation, the horizontal vane operates in
VANE AUTO ( ) mode.
Emergency operation continues until EMERGENCY OPERATION
switch is pressed once or twice or the unit receives any signal from
the remote controller. In case of latter, normal operation will start.
Operation mode
Set temperature
Fan speed
Horizontal vane
COOL/HEAT
24°C
Med.
Auto
The operation mode is indicated by the
Operation Indicator lamp as following
Operation Indicator lamp
EMERGENCY COOL
↓
EMERGENCY HEAT
↓
Lighted
Not lighted
STOP
NOTE: Do not press EMERGENCY OPERATION switch during normal
operation.
9-9. 3-MINUTE TIME DELAY OPERATION
When the system turns OFF, compressor will not restart for 3 minutes as 3-minute time delay function operates to protect
compressor from overload.
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10
TROUBLESHOOTING
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA
10-1. CAUTIONS ON TROUBLESHOOTING
1. Before troubleshooting, check the following
1) Check the power supply voltage.
2) Check the indoor/outdoor connecting wire for miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the main unit first with the remote controller, and then after
confirming the horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.
3) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.
4) When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wiring
Housing point
3. Troubleshooting procedure
1) First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing ON and OFF to indicate an abnormality.
To make sure, check how many times the abnormality indication is flashing ON and OFF before starting service work.
2) Before servicing, check that the connector and terminal are connected properly.
3) If the P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for
bursting and discoloration.
4) When troubleshooting, refer to 10-2., 10-3. and 10-4.
4. How to replace batteries
Weak batteries may cause the remote controller malfunction.
In this case, replace the batteries to operate the remote controller normally.
Remove the front lid and insert batteries.
Then reattach the front lid.
Press RESET button with a thin instrument, and
then use the remote controller.
Insert the negative pole of the
batteries first. Check if the polarity
of the batteries is correct.
RESET button
NOTE: 1. If RESET button is not pressed, the remote controller may not operate correctly.
2. This remote controller has a circuit to automatically reset the microcomputer when batteries are replaced.
This function is equipped to prevent the microcomputer from malfunctioning due to the voltage drop caused by the
battery replacement.
5. How to install the horizontal vane
If horizontal vane is not installed correctly, all of the operation indicator lamps will blink.
In this case, install the horizontal vane correctly by following the procedures to .
NOTE: Before installation of the horizontal vane, turn OFF the power supply.
2
In procedure lock the
stoppers until they click
into place.
Lock
1
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10-2. FAILURE MODE RECALL FUNCTION
Outline of the function
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (10-4.) disappears, the memorized failure details
can be recalled.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Operational procedure
The cause of abnormality cannot be found because the abnormality does not recur.
Setting up the failure mode recall function
Turn ON the power supply.
<Preparation of the remote controller>
While pressing both OPERATION SELECT button and TOO COOL button on the
remote controller at the same time, press RESET button.
First, release RESET button.
And release the other two buttons after all LCD in operation display section of the
remote controller is displayed after 3 seconds.
1 Regardless of normal or abnormal condition,
a short beep is emitted once the signal is received.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is
displayed) with the remote controller headed towards the indoor unit. 1
Does upper lamp of OPERATION INDICATOR
lamp on the indoor unit blink at the interval of 0.5
seconds?
Blinks: Either indoor or outdoor unit is abnormal.
Beep is emitted at the same timing as the
blinking of upper lamp of OPERATION
INDICATOR lamp. 2
Yes
(Blinks)
Judgment of indoor/outdoor abnormality
Before blinking, does upper lamp of
OPERATION INDICATOR lamp stay ON for 3
seconds?
Yes
Stays ON for 3 seconds (without beep):
The outdoor unit is abnormal.
No
Indoor unit is normal.
But the outdoor unit might be abnormal because there are some abnormalities that can not be recalled with this way.
Confirm if outdoor unit is abnormal according to the detailed outdoor unit
failure mode recall function.
No
(OFF)
The indoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the indoor unit
failure mode table. (Refer to 10-2.2)
2
Make sure to check at least two consecutive blinking cycles.
The outdoor unit is abnormal.
Check the blinking pattern, and confirm the abnormal point with the
outdoor unit failure mode table. (Refer to outdoor unit service manual.)
3
Make sure to check at least two consecutive blinking cycles.
Releasing the failure mode recall function
Release the failure mode recall function by the following procedures.
Turn OFF the power supply and turn it ON again.
Press RESET button of the remote controller.
Repair the defective parts.
Deleting the memorized abnormal condition
After repairing the unit, recall the failure mode again according to "Setting up the failure mode recall
function" mentioned above.
Press OPERATE/STOP (ON/OFF) button of the remote controller (the set temperature is displayed)
with the remote controller headed towards the indoor unit.
Press EMERGENCY OPERATION switch so that the memorized abnormal condition is deleted.
Release the failure mode recall function according to "Releasing the failure mode recall function"
mentioned above.
NOTE: 1. Make sure to release the failure mode recall function once it is set up, otherwise the unit cannot operate properly.
2. If the abnormal condition is not deleted from the memory, the last abnormal condition is kept memorized.
2. Blinking pattern when the indoor unit is abnormal:
Blinking at 0.52.5-second OFF second interval
Blinking at 0.52.5-second OFF second interval
ON
OFF
Beeps
Repeated cycle
Beeps
Repeated cycle
3.Blinking pattern when the outdoor unit is abnormal:
Blinking at 0.52.5-second OFF
3-second ON
second interval
Beeps
Repeated cycle
2.5-second OFF
3-second ON
Blinking at 0.5second interval
ON
OFF
No beep
Repeated cycle
Beeps
No beep
Repeated cycle
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Beeps
Repeated cycle
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2. Indoor unit failure mode table
Upper lamp of OPAbnormal point
ERATION INDICA(Failure mode)
TOR lamp
Not lighted
Normal
Condition
Correspondence
—
The room temperature thermistor short or
1-time flash every Room temperature
open circuit is detected every 8 seconds dur0.5-second
thermistor
ing operation.
Indoor coil
2-time flash
The indoor coil thermistor short or open circuit
2.5-second OFF
is detected every 8 seconds during operation.
thermistor
3-time flash
The serial signal from outdoor unit is not reSerial signal
2.5-second OFF
ceived for a maximum of 6 minutes.
The rotational frequency feedback signal is
11-time flash
Indoor fan motor
not emit during the 12 seconds the indoor fan
2.5-second OFF
operation.
It cannot properly read data in the nonvolatile
12-time flash
Indoor control
memory of the indoor electronic control P.C.
2.5-second OFF
system
board.
—
Refer to the characteristics of the room temperature
thermistor (10-7.2.).
Refer to the characteristics of the main indoor coil thermistor, the sub indoor coil thermistor (10-7.2.).
Refer to 10-6. "How to check miswiring and serial
signal error".
Refer to 10-6.
"Check of indoor fan motor".
Replace the indoor electronic control P.C. board.
NOTE: Blinking patterns of this mode differ from the ones of TROUBLESHOOTING CHECK TABLE (10-4.).
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10-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit operates.
Outdoor unit
does not operate.
Outdoor unit
operates only
in Test Run
operation.
Outdoor unit
does not
operate even
in Test Run
operation.
Indoor unit operates.
Outdoor unit does
not operate normally.
Indoor unit does
not receive the
signal from remote controller.
Indoor unit
operates, when
EMERGENCY
OPERATION
switch is pressed.
Unit does not
operate normal operation
in COOL or
HEAT mode.
OPERATION INDICATOR
lamp on the indoor unit is
flashing ON and OFF.
"Test Run operation" means the
operation within 30 minutes after EMERGENCY OPERATION
switch is pressed.
Indoor unit does
not operate, when
EMERGENCY
OPERATION
switch is pressed.
If blinking of OPERATION INDICATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Check room
temperature
thermistor.
Refer to 10-7.
"Test point
diagram and
voltage".
Refer to "How
to check
inverter/compressor".
Refer to
"Check of R.V.
coil".
Refer to 10-6.
"Check of remote
controller and
receiver P.C.
board".
1. Check indoor/outdoor connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 10-6. "Check
of indoor P.C. board
and indoor fan motor".
Refer to outdoor unit service manual.
All lamps
Flash on and
off at 0.5-second intervals
Cause:
Indoor unit
• The horizontal vane is
not installed
correctly.
Upper lamp
Flash on and
off at 0.5-second intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal
Upper lamp
2-time flash
Cause:
Indoor unit
• Trouble
of room
temperature
/ indoor coil
thermistor
Upper lamp
3-time flash
Cause:
Indoor unit
• Trouble of
indoor fan
motor
Upper lamp
4-time flash
Cause:
Indoor unit
• Trouble
of indoor
unit control
system
Upper lamp
5-time flash
Cause:
Outdoor unit
• Outdoor
power
system
abnormality
Upper lamp
6-time flash
Cause:
Outdoor unit
• Trouble of
thermistor in
outdoor unit
Upper lamp
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor control system
Upper lamp
14-time flash
Cause:
Outdoor unit
• Other abnormality
Refer to
10-6.
"Check of installation of
the horizontal vane".
Refer to
10-6. "How
to check miswiring and
serial signal
error".
Check room
temperature
thermistor
and indoor
coil thermistor. Refer to
10-7."Test
point diagram
and voltage".
Refer to
10-6.
"Check of
indoor fan
motor".
Replace the
indoor electronic control
P.C. board.
Refer to
"How to
check
inverter/compressor".
Refer to
"Check of
outdoor thermistors".
Replace the
inverter P.C.
board or
the outdoor
electronic
control P.C.
board.
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall function."
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10-4. TROUBLESHOOTING CHECK TABLE
Before taking measures, make sure that the symptom reappears for accurate troubleshooting.
When the indoor unit has started operation and detected an abnormality of the following condition (the first detection after the
power ON), the indoor fan motor turns OFF and OPERATION INDICATOR lamp flashes.
OPERATION INDICATOR
Lighted
Blinking
Not lighted
No.
1
Abnormal
point
Miswiring
or serial
signal
Indoor coil
thermistor
2
Room temperature
thermistor
Operation indicator lamp
Symptom
Condition
Upper lamp flashes.
0.5-second ON
Correspondence
The serial signal from the outdoor unit is not
received for 6 minutes.
• Refer to 10-6. "How to check
miswiring and serial signal error".
The indoor coil or the room temperature thermistor is short or open circuit.
• Refer to 10-7. the characteristics of indoor coil thermistor,
and the room temperature thermistor.
The rotational frequency feedback signal is
not emitted during the indoor fan operation.
• Refer to 10-6. "Check of indoor fan motor".
It cannot properly read data in the nonvolatile
memory of the indoor electronic control P.C.
board.
• Replace the indoor electronic
control P.C. board.
0.5-second OFF
Upper lamp flashes.
2-time flash
2.5-second OFF
Upper lamp flashes.
3-time flash
3
Indoor fan
motor
2.5-second OFF
Upper lamp flashes.
4-time flash
4
Indoor control system
2.5-second OFF
5
Outdoor
power system
Upper lamp flashes.
5-time flash
Indoor unit and
outdoor unit do
not operate.
2.5-second OFF
to "How to check of inIt consecutively occurs 3 times that the com- • Refer
verter/compressor".
pressor stops for overcurrent protection or
to outdoor unit service
start-up failure protection within 1 minute after Refer
manual
start-up.
• Check the stop valve.
Upper lamp flashes.
6-time flash
6
Outdoor
thermistors
The outdoor thermistors short or open circuit
during the compressor operation.
• Refer to "Check of outdoor
thermistor".
Refer to outdoor unit service
manual.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
• Replace the inverter P.C. board
or the outdoor electronic control
P.C. board.
Refer to outdoor unit service
manual.
An abnormality other than above mentioned
is detected.
• Check the stop valve.
• Confirm the abnormality in
detail using the failure mode
recall function for outdoor unit.
It cannot properly read data in the nonvolatile
memory of the inverter P.C. board or the outdoor electronic control P.C. board.
• Check the blinking pattern of
the LED on the inverter P.C.
board or the outdoor electronic
control P.C. board.
2.5-second OFF
7
Outdoor
control system
Upper lamp flashes.
7-time flash
2.5-second OFF
Upper lamp flashes.
14-time flash
8
Other abnormality
2.5-second OFF
9
Outdoor
control sys- Upper lamp lights up
tem
Outdoor unit
does not operate
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OPERATION INDICATOR
No.
Abnormal
point
Operation indicator lamp
Symptom
Condition
Correspondence
All lamps flash at the same time.
1
Indoor unit and
outdoor unit do
not operate.
Attachment 0.5-second ON
of the horizontal vane 0.5-second OFF
The electricity is not conducted to the interlock switch (Fan) of the horizontal vane.
• Refer to 10-6. "Check of
installation of the horizontal
vane".
OPERATION INDICATOR
No.
Abnormal
point
Operation indicator lamp
Symptom
Condition
Correspondence
Upper lamp lights and lower lamp flashes.
1
MXZ type
Operation
mode
setting
The operation mode of the each indoor unit
Outdoor unit
is differently set to COOL (includes DRY) and • Unify the operation mode.
operates but
HEAT at the same time, the operation mode
Refer to outdoor unit service
indoor unit does
of the indoor unit that has operated at first has manual.
not operate.
the priority.
2.5-second OFF
10-5. TROUBLE CRITERION OF MAIN PARTS
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA
Part name
Room temperature
thermistor (RT11)
Indoor coil thermistor
(RT12, RT13)
Indoor fan motor (MF)
Vane motor (MV)
Check method and criterion
Measure the resistance with a tester.
Figure
Refer to 10-7. "Test point diagram and voltage", "2. Indoor electronic control
P.C. board", the chart of thermistor.
Check 10-6.
Measure the resistance between the terminals with a tester.
(Temperature: 10 - 30°C)
Color of the lead wire
Normal
RED - BLK
223 - 268 Ω
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BLK
ROTOR
BLK
RED
BLK
BLK
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10-6. TROUBLESHOOTING FLOW
A Check of indoor fan motor
The indoor fan motor error has occurred, and the indoor fan does not operate.
Turn OFF the power supply.
Pay enough attention to the high voltage on the fan motor connector CN211.
Is there any foreign matter that interferes
the rotation of the line flow fan?
No
Yes
Remove the foreign matter and
adjust the line flow fan.
Is there 325 VDC
between CN211 (+)
and (–) ?
Turn ON the power supply, wait 5 seconds or more, and then press
EMERGENCY OPERATION switch.
Measure the supply voltage as follows within 12 seconds after EMERGENCY OPERATION switch is pressed.
If more than 12 seconds passes, turn OFF the power supply and turn it
ON again, then measure the voltage.
<Indoor power P.C. board>
1. Measure the voltage between CN211 (+) and (–).
2. Measure the voltage between CN211 (+) and (–).
<Indoor electronic control P.C. board>
3. Measure the voltage between CN10A (+) and JPG(GND)(–).
If more than 12 seconds passes after EMERGENCY OPERATION switch
is pressed, the voltage measured at 2. above goes 0 VDC although the
indoor P.C. board is normal.
Does the voltage between CN211
(+) and (–) on the power P.C. board
rise to the range of 2 to 6 VDC within
12 seconds after EMERGENCY
OPERATION switch is pressed?
Yes
Replace the indoor fan motor.
Yes
No
No
Replace the indoor power
P.C. board and the indoor
terminal P.C. board.
Yes
Does the voltage between CN10A
(+) and JPG (GND)(–) on the indoor
electronic control P.C. board fall to
2 V or less within 12 seconds after
EMERGENCY OPERATION switch is
pressed?
Replace the indoor electronic
control P.C. board.
No
The indoor fan motor error has occurred, and the indoor fan repeats "12-second ON and 30-second OFF" 3 times, and then stops.
Measure the voltage between CN211
(+) and (–) while the fan motor is
rotating.
Is it unchanged holding
0 or 15 VDC?
Yes
(Unchanged)
Measure the voltage CN10A (+)
and JPG (GND)(–) on the indoor
No
electronic control P.C board when
(Changed) the fan motor is rotaring.
Replace the indoor fan motor.
Replace the indoor power P.C.
board and the indoor terminal P.C.
board.
Is it unchanged holding
0 or 15 VDC?
Yes
(Unchanged)
No
(Changed)
Replace the indoor
electronic control P.C.
board.
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B Check of remote controller and indoor electronic control P.C. board
Check if the remote controller is exclusive for this air conditioner.
Press OPERATE/STOP (ON/OFF)
button on the remote controller.
Is LCD display on the remote controller
visible?
Yes
No
(Not clear)
Replace the batteries. (Refer to 10-1.4.)
Remove the batteries, then set them back
and press RESET button. (Refer to 10-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
No
Turn ON a radio to AM and press OPERATE/STOP (ON/OFF) button on the
remote controller.
Yes
OK
Is noise heard from radio?
No
Replace the remote controller.
Yes
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 1 m.?
No
Replace the indoor electronic control
P.C. board. (Including the receiver)
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Yes
• Reinstall the unit away from lights.
• Attach a filter on receiving part.
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C Check of indoor P.C. board and indoor fan motor
Turn OFF the power supply.
Remove indoor fan motor connector CN211
from indoor power P.C. board and vane
motor connector CN151 from the indoor
electronic control P.C. board and turn ON
the power supply.
Does the unit operate with the remote
controller?
Does OPERATION INDICATOR lamp light
up by pressing EMERGENCY OPERATION
switch?
No
Yes
Measure the resistance of indoor fan
motor.
Refer to 10-5
Short circuit:
Replace the indoor fan motor.
Measure the resistance of the vane
motor coil.
Refer to 10-5.
Short circuit:
Replace the vane motor and the indoor
electronic control P.C. board.
Replace the varistor (NR11)
and fuse (F11). 3
Yes
Is the varistor (NR11)
burnt and the fuse (F11)
blown?
Turn OFF the power supply.
Check both “parts side” and “pattern side” of the indoor terminal P.C.
board visually.
No
Be sure to check both the fuse
and the varistor in any case.
Is the fuse (F11) blown
only?
No
Yes
1. The fan motor connector's lead wire is red,
whereas is black.
2. Connect "+" of the tester to fan motor connector's
lead wire, and “-” to lead wire, otherwise the
resistance cannot be measured properly.
3. Please replace the fuse after removing the indoor
terminal P.C. board from the electrical box.
Measure the resistance between
CN211 (+) and (-) of indoor fan
motor connector. 1, 2
Is the resistance 1MΩ or more?
No
Replace the fuse (F11) and the
indoor fan motor. 3
Yes
Replace the fuse (F11). 3
Is the resistance of
resistor (R111) approx. 4
Ω? (GE22/25/35)
Is the resistance of reactor (L111) approx. 2.2 Ω?
(GE42/50)
Yes
Measure the resistance of resistor
(R111) on the indoor power P.C.
board. (GE22/25/35)
Measure the resistance of reactor
(L111) on the indoor power P.C.
board. (GE42/50)
Indoor electronic control
P.C. board
JPG (GND)
Replace the indoor
power P.C. board, the
indoor terminal P.C.
board and the indoor fan
motor.
No
Is the approx. 5 VDC between 5 V
(+) and JPG (GND) (-) of the indoor
electronic control P.C. board? Is there
approx. 9 V to 13 VDC between 12 V
(+) and JPG (GND) (-) of the indoor
electronic control P.C. board.
Yes
Replace the indoor fan motor.
No
Are connector CN10A on the
indoor electronic control P.C.
board or lead wires disconnected?
No
CN10A
12 VDC
Yes
5 VDC
Indoor terminal
P.C. board
Replace the indoor electronic control P.C. board.
Indoor power P.C. board
R111 (GE22/25/35)
L111 (GE42/50)
Fuse (F11)
Varistor
(NR11)
CN211
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Connect the connector or repair disconnection.
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D How to check miswiring and serial signal error
Turn OFF the power supply.
Is there rated voltage in the
power supply?
Check the power supply.
No
Yes
Turn ON the power supply.
Is there rated voltage between
outdoor terminal block S1 and
S2?
Yes
Check the wiring.
No
Press EMERGENCY OPERATION switch once.
Does the upper lamp of OPERATION INDICATOR lamp light up? <Confirmation of the power
to the indoor unit>
Yes
No
Is serial signal error indicated 6 minutes later?
Is there any miswiring,
poor contact, or wire
disconnection of the
indoor/outdoor connecting wire?
No
No
Yes
Yes
Correct them.
A
Turn OFF the power supply.
Check once more if the indoor/outdoor
B connecting wire is not miswiring.
Short-circuit outdoor terminal block S2
and S3. 1
1. Miswiring may damage indoor electronic control P.C.
board during the operation.
Be sure to confirm the wiring is correct before the operation starts.
3. Be sure to check this within 3 minutes after turning ON.
After 3 minutes, LED blinks 6 times. Even when the
inverter P.C. board or the outdoor electronic control P.C.
board is normal, LED blinks 6 times after 3 minutes.
(Except for outdoor unit of multi system type)
Turn ON the power supply.
Does the LED on the inverter P.C. board or
the outdoor electronic control P.C. board
repeat "3.6-second-OFF and 0.8-secondON quick blinking"? 3
Yes
A
• Turn OFF inverter-controlled lighting
equipment.
• Turn OFF the power supply and then
turn ON again.
• Press EMERGENCY OPERATION
switch.
Is serial signal
error indicated 6
minutes later?
Yes
B
• Reinstall
either the unit
or the light
each other
away.
• Attach a filter
No on remote
control receiving section
of the indoor
unit.
Turn OFF the power supply.
Remove the short-circuit between outdoor terminal block S2 and S3.
Turn ON the power supply.
Is there amplitude of 10 to 20 V DC
between indoor terminal block S2 and
S3? <Confirmation of serial signal>
Is there rated voltage between indoor
terminal block S1 and S2?
<Confirmation of power voltage>
No
(Lighted
or not
lighted)
No
Replace the inverter P.C. board or the outdoor
electronic control P.C. board.
2
2. Be careful of the residual voltage of smoothing
capacitor.
Is there any error of the indoor/outdoor connecting wire,
such as the damage of the wire,
intermediate connection, poor
contact to the terminal block?
No
Yes
Replace the
indoor/outdoor
connecting wire.
Yes
Is there 2 VDC or less between CN10A (+)
and JPG (GND)(-) on the indoor electronic
control P.C. board?
No
Yes
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
No
Yes
Replace the indoor power
P.C. board and the indoor
terminal P.C. board
Is there 2 VDC or less between
CN10A (+) and JPG (GND)(-) on
the indoor electronic control P.C.
board?
No
Replace the indoor electronic control P.C. board.
Be sure to release the failure-mode recall function after checking.
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Yes
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E Check of installation of the horizontal vane
Turn OFF the power supply.
Is the stopper of the horizontal vane
locked to the indoor unit correctly?
Yes
No
Re-lock the stopper of the horizontal vane to the indoor unit.
(Refer to 10-1.5.)
Turn ON the
power supply.
Are all lamps flashing?
Yes
To check the continuity of the interlock
switch (Fan), measure the resistance of
connector - connected to CN1R1 on
the indoor electronic control P.C. board.
Is there resistance 0 Ω?
No(
Turn OFF the power supply.
)
Replace the interlock switch (Fan).
Yes
Replace the indoor electronic
control P.C. board.
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No
OK
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F Electromagnetic noise enters into TV sets or radios
Is the unit earthed?
Earth the unit.
No
Yes
Is the distance between the antennas
and the indoor unit within 3 m, or is the
distance between the antennas and the
outdoor unit within 3 m?
No
Yes
Extend the distance between the antennas and
the indoor unit, and/or the antennas and the
outdoor unit.
Is the distance between the TV sets or
radios and the indoor unit within 1 m, or
is the distance between the TV sets or
radios and the outdoor unit within 3 m?
No
Yes
Extend the distance between the TV sets and/or
radios and the indoor unit, or the TV sets or
radios and the outdoor unit.
Are the antennas damaged?
Is the coaxial cable damaged?
Is there any poor contact in the antenna wiring?
No
Yes
Replace or repair the antenna.
Replace or repair the coaxial cable.
Yes
Extend the distance between the indoor/outdoor
connecting wire of the air conditioner and the wiring of the antennas.
Is the indoor/outdoor connecting wire
of the air conditioner and the wiring of
the antennas close?
No
Even if all of the above conditions are fulfilled, the electromagnetic noise may enter, depending on the electric field strength
or the installation condition (combination of specific conditions such as antennas or wiring).
Check the following before asking for service.
1. Devices affected by the electromagnetic noise
TV sets, radios (FM/AM broadcast, shortwave)
2. Channel, frequency, broadcast station affected by the electromagnetic noise
3. Channel, frequency, broadcast station unaffected by the electromagnetic noise
4. Layout of:
indoor/outdoor unit of the air conditioner, indoor/outdoor wiring, earth wire, antennas, wiring from antennas, receiver
5. Electric field intensity of the broadcast station affected by the electromagnetic noise
6. Presence or absence of amplifier such as booster
7. Operation condition of air conditioner when the electromagnetic noise enters in
1) Turn OFF the power supply once, and then turn ON the power supply. In this situation, check for the electromagnetic
noise.
2) Within 3 minutes after turning ON the power supply, press OPERATE/STOP (ON/OFF) button on the remote controller
for power ON, and check for the electromagnetic noise.
3) After a short time (3 minutes later after turning ON), the outdoor unit starts running. During operation, check for the
electromagnetic noise.
4) Press OPERATE/STOP (ON/OFF) button on the remote controller for power OFF, when the outdoor unit stops but the
indoor/outdoor communication still runs on. In this situation, check for the electromagnetic noise.
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10-7. Test point diagram and voltage
1. Indoor power P.C. board, Indoor terminal P.C. board
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA
Indoor terminal P.C. board
Fuse (F11)( )
Indoor power P.C. board
Varistor (NR11)
Resistor (R111)
Indoor fan motor
(CN211)
325 VDC
(–) GND (highvoltage DC)
15 VDC
(+)3-6 VDC
(+)0-6 V
Terminal
block
Connector to indoor electronic
control P.C. board (CN20A)
5 VDC
12 VDC
GND
Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.
MSZ-GE42VA MSZ-GE50VA
Indoor terminal P.C. board
Fuse (F11)( )
Indoor power P.C. board
Varistor (NR11)
Reactor (L111)
Indoor fan motor
(CN211)
325 VDC
(–) GND (highvoltage DC)
15 VDC
(+)3-6 VDC
(+)0-6 V
Terminal
block
Connector to indoor electronic
control P.C. board (CN20A)
5 VDC
12 VDC
GND
Please replace the fuse after removing the indoor terminal P.C. board from the electrical box.
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2. Indoor electronic control P.C. board
Timer short mode point
JPG JPS
(Refer to 8-1.)
Room temperature thermistor RT11 (CN111)
Indoor coil thermistor RT12, RT13 (CN112)
GND
Interlock switch (FAN) (CN1R1)
Connector to
Indoor power P.C. board
(CN10A)
12 VDC
Emergency operation
switch (E.O.SW) (SW1)
Room temperature thermistor (RT11)
Indoor coil thermistor (RT12, RT13)
Resistance (kΩ)
Vane motor (CN151)
5 VDC
Release of Auto restart function
Solder the Jumper wire to JR07
(Refer to 8-3.)
Temperature (°C)
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11
DISASSEMBLY INSTRUCTIONS
<"Terminal with locking mechanism" Detaching points>
The terminal which has the locking mechanism can be detached as shown below.
There are two types (refer to (1) and (2)) of the terminal with locking mechanism.
The terminal without locking mechanism can be detached by pulling it out.
Check the shape of the terminal before detaching.
(1) Slide the sleeve and check if there is a locking lever or not.
Sleeve
Locking lever
(2) The terminal with this connector has the
locking mechanism.
Slide the sleeve.
Pull the terminal while
pushing the locking
lever.
Hold the sleeve, and
pull out the terminal
slowly.
Connector
MSZ-GE22VA MSZ-GE25VA MSZ-GE35VA MSZ-GE42VA MSZ-GE50VA
NOTE: Turn OFF power supply before disassembling.
OPERATING PROCEDURE
PHOTOS
1. Removing the panel
Photo 1
(1) Remove the horizontal vanes.
(2) Remove the screw caps of the panel. Remove the
screws of the panel.
(3) Unhook the lower part ( ) of the panel.
(4) Hold the lower part of both ends of the panel and pull
it slightly toward you, and then remove the panel by
pushing it upward.
Horizontal vanes
Front panel
A
Screws of the panel
32
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OPERATING PROCEDURE
2. Removing the indoor electronic control P.C.
board and the room temperature thermistor
(1) Remove the panel (refer to 1.) and the corner box.
(2) Remove the screw of the V.A. clamp. Remove the V.A.
clamp and the indoor/outdoor connecting wire.
(3) Open the indoor electronic control P.C. board holder (to
right side)
(4) Disconnect the following connectors:
<Indoor electronic control P.C. board>
CN112 (Indoor coil thermistor)
CN151 (Vane motor)
CN1R1 (Interlock switch)
CN10A (To the indoor power P.C. board)
(5) Unhook the catches of the indoor electronic control P.C.
board holder from the nozzle and the electrical box
(right side).
(6) Remove the room temperature thermistor from the
hook of the indoor electronic control P.C. board holder.
(7) Open the back side of the indoor electronic control P.C.
board holder, and remove the indoor electronic control P.C. board.
(8) Remove the room temperature thermistor from the
indoor electronic control P.C. board
PHOTOS
Photo 2
Earth wire
Electrical box
Screw of the
electrical cover
V.A. clamp
Catch of indoor electronic
control P.C. board holder
Indoor electronic control
P.C. board holder
Photo 3
Upper catch
Indoor terminal
P.C. board
Indoor power
P.C. board
3. Remove the indoor power P.C. board, the indoor
terminal P.C. board, and the electrical box
(1) Remove the panel (refer to 1.) and the corner box.
(2) Remove the indoor/outdoor connecting wire. (Refer to
2.)
(3) Remove the earth wire connected to the indoor heat
exchanger from the electrical box.
(4) Unhook first the lower, then the upper catches of the
electrical box, and pull out the electrical box.
(5) Remove the screw of the electrical cover and remove
the electrical cover.
(6) Disconnect all the connectors on the indoor power P.C.
board and unhook all lead wires.
(7) Remove the screw of terminal block on the indoor terminal P.C. board.
(8) Remove the indoor power P.C. board and the indoor
terminal P.C. board.
Terminal block
Lower catch
Catch of indoor electronic control P.C.
board holder
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OPERATING PROCEDURE
PHOTOS
4. Removing the nozzle assembly
Photo 4
(1) Remove the panel (refer to 1.) and the corner box.
(2) Remove the indoor/outdoor connecting wire. (Refer to
2.)
(3) Remove the indoor electronic control P.C. board holder
(4) Disconnect the following connectors:
<Indoor electronic control P.C. board>
CN1R1 (Interlock switch)
(5) Pull out the drain hose from the nozzle assembly and
remove the nozzle assembly.
(6) Remove the interlock switch.
Interlock switch
5. Removing the horizontal vane motor
(1) Remove the nozzle assembly. (Refer to 4.)
(2) Remove the screws of the horizontal vane motor unit.
(3) Disconnect the connector from the horizontal vane
motor.
(4) Remove the screws of the horizontal vane motor.
(5) Remove the horizontal vane motor from the horizontal
vane motor unit.
Screws of the interlock switch
Photo 5
Screws of horizontal vane motor unit
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OPERATING PROCEDURE
PHOTOS
Photo 6
6. Removing the indoor fan motor, the indoor coil
thermistor, and the line flow fan
(1) Remove the panel (refer to 1.) and the corner box.
(2) Remove the indoor electronic control P.C. board holder, the electrical box and the nozzle assembly.
(3) Remove the screws fixing the motor bed.
(4) Loosen the screw fixing the line flow fan.
(5) Remove the motor bed together with fan motor and
motor band.
(6) Release the hooks of the motor band. Remove the
motor band. Pull out the indoor fan motor.
(8) Remove the indoor coil thermistor from the heat
exchanger.
( ) Install the indoor coil thermistor in its former position
when assembling it. (Refer to Photo 9)
(9) Remove the screws fixing the left side of the heat
exchanger.
(10) Lift the heat exchanger, and pull out the line flow fan
to the lower-left.
Screws of the line flow fan
Photo 7
Motor band
Photo 9
Screws of the
motor bed
Indoor coil
thermistor(sub)
RT13
Indoor coil
thermistor(main)
RT12
Photo 8
Screws of the
left side of the
heat exchanger
35
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HEAD OFFICE: TOKYO BLDG., 2-7-3, MARUNOUCHI, CHIYODA-KU, TOKYO 100-8310, JAPAN
© Copyright 2008 MITSUBISHI ELECTRIC CO.,LTD
Distributed in Dec. 2008. No. OBH515 REVISED EDITION-B 5
Distributed in Sep. 2008. No. OBH515 REVISED EDITION-A 5
Distributed in Aug. 2008. No. OBH515 6
Made in Japan
New publication, effective Dec. 2008
Specifications subject to change without notice.
www.ilmalämpöpumput.com
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