SERVICE MANUAL
SERVICE MANUAL
Mini-Split Air Conditioner
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Read this manual before installation and operation
Make sure that it is well kept for later reference
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Cooling
Heating
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10
9
7
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6
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12K
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5
Current(A)
Current(A)
6
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4
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Condition
Indoor:DB 27 WB19
Indoor air flow: Turbo
Pipe length:5m
Voltage:230V
2
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3
Condition
Indoor:DB 20
Indoor air flow:Turbo
Pipe length:5m
Voltage:230V
2
1
1
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0
20
40
60
80
100
0
120
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Compressor Speed(rps)
40
60
80
100
120
Compressor Speed(rps)
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110
120
100
100
90
80
Capacity ratio(%)
Capacity ratio(%)
Cooling
80
70
Condition
Indoor:DB27℃ WB19℃
Indoor air flow: Turbo
Pipe length:5m
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50
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Outdoor temp. (°C)
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Condition
Indoor:DB20℃
Indoor air flow: Turbo
Pipe length:5m
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0
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Outdoor temp. (°C)
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Indoor side noise when blowing
Outdoor side noise when Compressor speed changed
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35
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High
Middle
Indoor fan motor rotating speed
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side
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4-Way valve
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Heat
exchanger
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Accumlator
Heat
exchanger
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side
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expansion
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Top view
Solid-state relay
Port of neutral wire
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Live wire of health function
Port of indoor fan
Port of motor for vertical swing
Port of motor for
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Protective
tube
Jumper cap
Buzzer
Port of indoor ambient
temp sensor
Port of indoor pipe
temp sensor
Power of
switch
Port of display
High-frequency transformer
Communication port
Main chip
Bottom view
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inductance pin1
inductance pin2
fan neilsbed
four-way valve
compressor
electric heater
chassis
electric heater
10-core
communication cable
compressor
temp. sensor
overload protection
electric expansion valve
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ON/OFF Button
2
MODE Button
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FAN Button
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Button
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CLOCK Button
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TIMER ON/TIMER-OFF Button
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X-FAN Button
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3
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Set fan speed
Operation mode
Send signal
Auto mode
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Fan mode
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Set temperature
Turbo mode
Set time
Clock
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Sleep mode
Child lock
Temp. display type
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Signal sender
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Cover of
battery box
Remove
Panel
Emergency operation
switch
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1. Temperature Parameters
Indoor preset temperature (Tpreset)
Indoor ambient temperature (T amb.)
2. Basic Functions
Once energized, in no case should the compressor be restarted within less than 3 minutes. In the situation that memory
function is available, for the first energization, if the compressor is at stop before de-energization, the compressor will be
started without a 3-minute lag; if the compressor is in operation before de-energization, the compressor will be started with
a 3-minute lag; and once started, the compressor will not be stopped within 6 minutes regardless of changes in room
temperature;
(1)COOL mode
The condition and process of cooling
If Tamb. ≥Tpreset COOL mode will act, the compressor and outdoor fan will run, and the indoor fan will run at the set speed.
If Tamb. ≤Tpreset-2 , the compressor will stop, the outdoor fan will delay 30 seconds to stop, and the indoor fan will run at the set speed.
If Tpreset-2
≤Tamb ≤Tpreset , the unit will keep running in the previous mode.
In this mode, the reversal valve will not be powered on and the temperature setting range is 16
~30 .
Start cooling
Tamb.
Tpreset
Original operating status
Tpreset –2 ˚C
≥ 6 min.
≥ 3 min.
≥ 6 min.
Stop cooling
Compressor
Outdoor fan
Setting fan speed
Indoor fan
Run
Protection function
Overcurrent protection
Stop
If total current is high, the compressor will run in limited frequency. If total current is too high, the compressor will stop, the
outdoor fan will delay 30 seconds to stop, indoor unit will display E5 and outdoor yellow light will blink 5 times.
Antifreezing protection
When the antifreezing protection is detected, the compressor will stop, the outdoor fan will stop after 30 seconds, and the
indoor fan and swing motor will keep running in the original mode. When antifreezing protection is eliminated and the
compressor has stopped for 3 minutes, the compressor will resume running in the original mode.
During antifreeze protection
min
Compressor
Outdoor fan
Preset speed
Indoor fan
Run
Stop
(2) Dehumidifying Mode
Working conditions and process of dehumidifying
If T amb. T preset, the unit will enter cooling and dehumidifying mode, in which case the compressor and the outdoor fan will
operate and the indoor fan will run at low speed.
If T preset -2
T amb. T preset, the compressor remains at its original operation state.
If T amb.< T preset -2 , the compressor will stop, the outdoor fan will stop with a time lag of 30s, and the indoor fan will
operate at low speed.
Protection
Protection is the same as that under the cooling mode.
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Preparation before installation
Read the requirements
for electric connection
select installation
location
Select indoor unit
installation location
Prepare tools
Select outdoor unit
installation location
Install the support of outdoor unit
(select it according to the actual situation)
Install wall-mounting
frame, drill wall holes
Connect pipes of indoor
unit and drainage pipe
Fix outdoor unit
Connect wires of indoor unit
Install drainage joint of outdoor unit
(only for cooling and heating unit)
Bind up pipes and
hang the indoor unit
Make the bound pipes pass
through the wall hole and then
connect outdoor unit
Connect pipes of outdoor unit
Connect wires of outdoor unit
Neaten the pipes
Vacuum pumping and leakage detection
Check after installation and test operation
Finish installation
Note: this flow is only for reference; please find the more detailed installation steps in this section.
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Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
1
2
3
4
Antifreezing
protection
In defect of
refrigerant
High
discharge
temperature
protection of
compressor
5
Overcurrent
protection
6
Communication
Malfunction
7
High
temperature
resistant
protection
8
EEPROM
malfunction
9
Limit/
decrease
frequency
due to high
temperature
of module
10
High
pressure
protection of
system
Malfunction
protection of
jumper cap
E1
E2
Display Method of Outdoor
Unit
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display status and during
blinking, ON 0.5s and OFF
A/C status
Possible Causes
0.5s
Operation Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
During cooling and drying
operation, except indoor
fan operates, all loads stop
operation.
During heating operation, the
complete unit stops.
OFF 3s
and blink
once
OFF 3S
and blink
twice
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates.
OFF 1S
and blink
3 times
OFF 1S
and
blink
9 times
F0
Possible reasons:
1. Refrigerant was superabundant;
2. Poor heat exchange (including
and bad radiating environment );
Ambient temperature is too high.
1. Poor air-return in indoor unit;
2. Fan speed is abnormal;
3. Evaporator is dirty.
1.In defect of refrigerant;
The Dual-8 Code Display will 2.Indoor evaporator temperature
show F0 and the complete unit sensor works abnormally;
stops.
3.The unit has been plugged up
somewhere.
E4
OFF 3S
and blink
4 times
OFF 1S
and blink
7 times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all loads stop.
Please refer to the malfunction
analysis (discharge protection,
overload).
E5
OFF 3S
and blink
5
times
OFF 1S
and blink
5 times
During cooling and drying
operation, compressor and
outdoor fan stop while indoor
fan operates. During heating
operation, all loads stop.
1. Supply voltage is unstable;
2. Supply voltage is too low and
load is too high;
3. Evaporator is dirty.
E6
OFF 3S
and blink
6
times
Always
ON
During cooling operation,
compressor stops while
indoor fan motor operates.
During heating operation, the
complete unit stops.
Refer to the corresponding
malfunction analysis.
E8
OFF 3S
and blink
8
times
OFF 1S
and blink
6 times
During cooling operation:
compressor will stop while
indoor fan will operate.
During heating operation, the
complete unit stops.
Refer to the malfunction analysis
(overload, high temperature
resistant).
OFF 3S OFF 1S
and blink and blink
15 times 11 times
EE
OFF 3S OFF 3S
and blink and blink
6 times 6 times
EU
C5
OFF 3S
and blink
15 times
During cooling and drying
operation, compressor will stop
Replace outdoor control panel AP1
while indoor fan will operate;
During heating operation, the
complete unit will stop
All loads operate normally,
while
operation frequency for
compressor is decreased
Wireless remote receiver and
button are effective, but can
not dispose the related
command
Discharging after the complete unit
is de-energized for 20mins, check
whether the thermal grease on
IPM Module of outdoor control
the radiator is inserted tightly.
If its no use, please replace control
panel AP1.
1. No jumper cap insert on
mainboard.
2. Incorrect insert of jumper cap.
3. Jumper cap damaged.
4. Abnormal detecting circuit of
mainboard.
,QVWDOODWLRQDQG0DLQWHQDQFH
6HUYLFH0DQXDO
Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
11
12
Gathering
refrigerant
Indoor
ambient
temperature
sensor is
open/short
circuited
Fo
F1
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
13
OFF 3S OFF 3S
and blink and blink
1 times 1 times
When the outdoor unit receive
signal of Gathering refrigerant
,the system will be forced to
Nominal cooling mode
run under cooling mode for
gathering refrigerant
OFF 1S
and blink
17 times
1. Loosening or bad contact of
indoor ambient temp. sensor and
During cooling and drying
mainboard terminal.
operation, indoor unit operates
2. Components in mainboard fell
while other loads will stop;
down leads short circuit.
during heating operation,
3. Indoor ambient temp. sensor
the complete unit will stop
damaged.(check with sensor
operation.
resistance value chart)
4. Mainboard damaged.
OFF 3S
and blink
once
AC stops operation once
reaches the setting
temperature. Cooling, drying:
internal fan motor stops
operation while other loads
stop operation; heating: AC
stop operation
F2
OFF 3S
and blink
twice
F3
OFF 3S
and blink
3 times
F4
OFF 3S
and blink
4 times
circuited
14
15
Outdoor
ambient
temperature
sensor is
open/short
circuited
Outdoor
condenser
temperature
sensor is
open/short
circuited
16
Outdoor
discharge
temperature
sensor is
open/short
circuited
17
Limit/
decrease
frequency
due to
overload
18
Decrease
frequency
due to
overcurrent
Possible Causes
Operation Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
Indoor
evaporator
temperature
sensor is
open/short
A/C status
OFF 1S
and
blink
6 times
OFF 1S
and
blink
5 times
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation,
the complete unit will stop
operation
During cooling and drying
operation, compressor stops
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
1. Loosening or bad contact of
Indoor
evaporator temp. sensor and
mainboard terminal.
2. Components on the mainboard
fall
down leads short circuit.
3. Indoor evaporator temp. sensor
damaged.(check temp. sensor
value
chart for testing)
4. Mainboard damaged.
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
F5
OFF 3S
and blink
5 times
OFF 1S
and
blink
7 times
During cooling and drying
operation, compressor will sop
after operating for about 3
mins,
while indoor fan will operate;
During heating operation, the
complete unit will stop after
operating for about 3 mins.
F6
OFF 3S
and blink
for 6
times
OFF 1S
and
blink
3 times
All loads operate normally,
while
operation frequency for
compressor is decreased
Refer to the malfunction analysis
(overload, high temperature
resistant)
F8
OFF 3S
and blink
8 times
OFF 1S
and
blink
once
All loads operate normally,
while
operation frequency for
compressor is decreased
The input supply voltage is too low;
System pressure is too high and
overload
,QVWDOODWLRQDQG0DLQWHQDQFH
1.Outdoor temperature sensor
hasnt been connected well or is
damaged. Please check it by
referring to the resistance table for
temperature sensor)
2.The head of temperature sensor
hasnt been inserted into the copper
tube
6HUYLFH0DQXDO
Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
19
due to
high air
F9
OFF 1S
and
blink
twice
OFF 3S
and blink
9 times
discharge
20
21
Limit/
decrease
frequency
due to
antifreezing
Voltage for
DC bus-bar
is too high
FH
PH
Possible Causes
Operation Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
Decrease
frequency
A/C status
blinking, ON 0.5s and OFF
0.5s
OFF 1S
and
blink
4 times
OFF 3S OFF 3S
and blink and blink
2 times 2 times
OFF 1S
and
blink
13 times
OFF 3S
and blink
11 times
All loads operate normally,
while
operation frequency for
compressor is decreased
All loads operate normally,
while operation frequency for
compressor is decreased
Overload or temperature is too
high;
Malfunction of electric expansion
valve (EKV)
Poor air-return in indoor unit or fan
speed is too low
1. Measure the voltage of position
L and N on wiring board (XT), if the
During cooling and drying
voltage is higher than 265VAC, turn
operation, compressor will stop on the unit after the supply voltage
is increased to the normal range.
while indoor fan will operate;
2.If the AC input is normal,
During heating operation, the measure the voltage of electrolytic
complete unit will stop
capacitor C on control panel (AP1),
if its normal, theres malfunction
operation.
for the circuit, please replace the
control panel (AP1)
1. Measure the voltage of position
L and N on wiring board (XT), if the
22
Voltage of
DC bus-bar
is too low
23
Compressor
Min
frequence in
test state
24
Compressor
rated
frequence in
test state
25
Compressor
maximum
frequence in
test state
OFF 3S
and blink
21 times
PL
OFF 1S
and
blink
12 times
voltage is higher than 150VAC,
turn on the unit after the supply
During cooling and drying
voltage is increased to the normal
operation, compressor will stop
range.
while indoor fan will operate;
AC input is normal,
During heating operation, the 2.If the
measure
the voltage of electrolytic
complete unit will stop
capacitor C on control panel (AP1),
if its normal, theres malfunction
for the circuit, please replace the
control panel (AP1)
P0
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during min. cooling or
min. heating test
P1
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during nominal cooling or
nominal heating test
P2
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
Showing during max. cooling or
max. heating test
,QVWDOODWLRQDQG0DLQWHQDQFH
6HUYLFH0DQXDO
Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
Compressor
26
27
28
intermediate
frequence in
test state
Overcurrent
protection of
phase
current for
compressor
Charging
malfunction
of capacitor
P3
P5
PU
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
30
of module
temperature
sensor circuit
Module high
temperature
protection
P7
P8
(during
blinking,
ON
0.25s
and OFF
0.25s)
(during
blinking,
ON
0.25s
and OFF
0.25s)
OFF 3S
and blink
15 times
OFF 3S
and blink
17 times
OFF 3S
and blink
18 times
During cooling and drying
operation, compressor will stop
Refer to the part three—charging
while indoor fan will operate;
malfunction analysis of capacitor
During heating operation, the
complete unit will stop
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
Replace outdoor control panel AP1
During heating operation, the
complete unit will stop
After the complete unit is deenergized for 20mins, check
whether the thermal grease on IPM
Module of outdoor control panel
All loads operate normally,
while
operation frequency for
compressor is decreased
Refer to the malfunction analysis
(overload, high temperature
resistant)
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
1. Wiring terminal OVC-COMP
is loosened. In normal state, the
resistance for this terminal should
be less than 1ohm.
2.Refer to the malfunction analysis (
discharge protection, overload)
H0
32
Static
dedusting
protection
H2
OFF 3S
and blink
twice
,QVWDOODWLRQDQG0DLQWHQDQFH
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
During cooling operation,
compressor will stop while
indoor fan will operate;
During heating operation, the
complete unit will stop
31
H3
middle heating test
OFF 3S
and blink
19 times
OFF 3S
and blink
10 times
Overload
protection for
compressor
Showing during middle cooling or
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
Decrease
frequency
due to high
temperature
resistant
during
heating
operation
33
Possible Causes
Operation Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
Malfunction
29
A/C status
OFF 3S OFF 1S
and blink and blink
3 times 8 times
radiator is inserted tightly. If its no
use, please replace control panel
AP1.
6HUYLFH0DQXDO
Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
34
35
36
System is
abnormal
IPM
protection
Module
temperature
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
A/C status
Possible Causes
0.5s
Operation Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
During cooling and drying
operation, compressor will stop
OFF 3S OFF 1S
and blink and blink
4 times 6 times
H4
H5
OFF 3S OFF 1S
and blink and blink
5 times 4 times
H5
OFF 3S OFF 1S
and blink and blink
5 times 10 times
is too high
while indoor fan will operate;
During heating operation, the
complete unit will stop
Refer to the malfunction analysis
(overload, high temperature
resistant)
operation.
During cooling and drying
Refer to the malfunction
operation, compressor will stop
analysis (IPM protection, loss
while indoor fan will operate;
of synchronism protection and
During heating operation, the
overcurrent protection of phase
complete unit will stop
current for compressor.
operation.
1. Bad contact of DC motor
37
38
Internal motor
(fan motor) do
not operate
Desynchronizing of
H6
OFF 3S
and blink
11 times
PFC
protection
40
Outdoor DC
fan motor
malfunction
7 times
OFF 3S OFF 1S
and blink and blink
6 times 14 times
HC
feedback terminal.
2. Bad contact of DC motor
control end.
3. Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard rev
detecting circuit.
During cooling and drying
Refer to the malfunction
operation, compressor will stop analysis (IPM protection, loss
while indoor fan will operate;
of synchronism protection and
During heating operation, the
overcurrent protection of phase
complete unit will stop
current for compressor.
operation.
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
Refer to the malfunction analysis
During heating operation, the
complete unit will stop
operation.
OFF 3S
and blink
H7
compressor
39
Internal fan motor, external fan
motor, compressor and electric
heater stop operation,guide
louver stops at present
location.
OFF 1S
and
blink
14 times
DC fan motor malfunction or
Outdoor DC fan motor
malfunction lead to compressor system blocked or the connector
stop operation,
loosed
L3
OFF 3S
and blink
23 times
41
power
protection
L9
OFF 3S
and blink
20 times
OFF 1S
and blink
9 times
compressor stop operation and
Outdoor fan motor will stop
To protect the electronical
30s latter , 3 minutes latter
components when detect high
fan motor and compressor will power
restart
42
Indoor unit
and outdoor
unit doesn't
match
LP
OFF 3S
and blink
19 times
OFF 1S
and blink
16 times
compressor and Outdoor fan
motor can’t work
43
Failure startup
LC
OFF 3S
and blink
11 times
Indoor unit and outdoor unit doesn't
match
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
Refer to the malfunction analysis
During heating operation, the
complete unit will stop
operation.
,QVWDOODWLRQDQG0DLQWHQDQFH
6HUYLFH0DQXDO
Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
During cooling and drying
phase current
detection
U1
circuit for
OFF 3S
operation, compressor will stop
and blink
while indoor fan will operate;
13 times
During heating operation, the
compressor
45
46
Malfunction of
voltage
dropping for
DC bus-bar
Malfunction
of complete
units current
detection
Possible Causes
Operation Cool
Heating Yellow
Red
Green
Indicator Indicator Indicator Indicator Indicator Indicator
Malfunction of
44
A/C status
blinking, ON 0.5s and OFF
0.5s
Replace outdoor control panel AP1
complete unit will stop
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
Supply voltage is unstable
During heating operation, the
complete unit will stop
OFF 3S
and blink
20 times
U3
During cooling and drying
operation, the compressor will
stop while indoor fan will
operate;
During heating operating,
the complete unit will stop
OFF 3S
and blink
13 times
U5
Theres circuit malfunction on
outdoor units control panel AP1,
please replace the outdoor units
control panel AP1.
operation.
47
The four-way
valve is
If this malfunction occurs
OFF 3S
and blink
20 times
U7
abnormal
48
Zerocrossing
malfunction of
U9
during
heating operation, the complete broken;
unit will stop operation.
3.4V is damaged, please replace
4V.
During cooling operation,
compressor will stop while
indoor fan will operate; during
heating,the complete unit will
stop operation.
OFF 3S
and blink
18 times
outdoor unit
49
Frequency
limiting
(power)
50
Compressor
running
51
The
temperature
for turning
on the unit is
reached
OFF 1S
and blink
8 times
52
Frequency
limiting
(module
temperature)
OFF 1S
and blink
11 times
,QVWDOODWLRQDQG0DLQWHQDQFH
1.Supply voltage is lower than
AC175V;
2.Wiring terminal 4V is loosened or
Replace outdoor control panel AP1
OFF 1S
and blink
13 times
OFF 1S
and blink
once
6HUYLFH0DQXDO
Display Method of Indoor Unit
Indicator Display (during
NO.
Malfunction
Name
Dual-8 blinking, ON 0.5s and OFF
Code 0.5s)
Display Method of Outdoor Unit
Indicator has 3 kinds of display
status and during blinking, ON
Heating Yellow
Red
Display Operation Cool
Indicator Indicator Indicator Indicator Indicator
54
communication
Defrosting
Possible Causes
Green
Indicator
OFF 0.5S
and blink
once
Normal
53
A/C status
0.5s and OFF 0.5s
OFF 3S
and blink
once
(during
OFF 1S
blinking,
and blink
ON 10s
twice
and OFF
0.5s)
Defrosting will occur in
heating
mode. Compressor will
operate
while indoor fan will stop
operation.
Its the normal state
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7URXEOHVKRRWLQJIRU0DLQ0DOIXQFWLRQ
0DOIXQFWLRQRI7HPSHUDWXUH6HQVRU))
Troubleshooting for
F1,F2 malfunction
Is
the wiring terminal between the
temperature sensor and the controller
loosened or poorly contacted?
yes
Insert the temperature
sensor tightly
no
no
Is there short circuit due to trip-over of
the parts?
Is malfunction
eliminated
yes
Make the parts upright
no
no
Is the
temperature sensor normal according
to the Resistance
Table?
Is malfunction
eliminated
yes
no
Replace it with a
temperature sensor
with the same model
yes
no
Is malfunction
removed
yes
Replace the mainboard
with the same model.
yes
End
,QVWDOODWLRQDQG0DLQWHQDQFH
6HUYLFH0DQXDO
0DOIXQFWLRQRI%ORFNHG3URWHFWLRQRI,'8)DQ0RWRU+
Troubleshooting for
H6 malfunction
Stir the blade
with a tool to see whether
the blade rotates
smoothly
yes
no
Tighten the screw; reassemble the blade, motor
and shaft bearing rubber base sub-assy to make
sure there is no foreign object between them
Is malfunction
eliminated
no
Is the
control terminal of PG motor
connected tightly ?
yes
no
Insert the control
terminal of PG
motor tightly
yes
Is malfunction
eliminated
no
Stir the blade by
hand to see whether
the blade rotate s
smoothly
yes
no
Reinstall the blade and
motor correctly
yes
no
Turn on the
unit again ; measure whether the output
voltage on control terminal for PG motor
is more than 50V within 1 min after the
louvers are opened
yes
Measure the voltage of this foot to neutral
wire on the mainboard
Is malfunction
eliminated
yes
yes
yes
Is the motor
started up
no
no
Replace PG motor
no
Is malfunction
eliminated
yes
Replace the mainboard
with the same model.
End
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6HUYLFH0DQXDO
0DOIXQFWLRQRI3URWHFWLRQRI-XPSHU&DS&
Troubleshooting for C5
malfunction
Is there jumper cap on the
mainboard?
no
Appearance of
the jumper cap
Assemble the jumper
cap with the same
model
yes
Is malfunction
eliminated
no
Is
the jumper cap inserted
correctly and
tightly ?
no
Insert the
jumper cap
tightly
yes
no
Is malfunction
eliminated
yes
Replace the jumper cap
with the same model
yes
Is malfunction
eliminated
yes
no
Replace the mainboard
with the same model.
End
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6HUYLFH0DQXDO
0DOIXQFWLRQRI2YHUFXUUHQW3URWHFWLRQ(
Troubleshooting
for E5 malfunction
Is the supply voltage unstable
with big fluctuation?
yes
no
Is the supply voltage too low
with overload?
Normal fluctuation is within 10 % of the rated
voltage on the nameplate
Malfunction is
eliminated
yes
Malfunction is
eliminated
yes
Malfunction is
eliminated
yes
no
yes
Adjust the supply voltage to maintain it within
normal range
no
no
Is the indoor / outdoor
heat exchanger too dirty,or are the air inlet
and outlet blocked?
yes
no
no
The fan is abnormal? Fan
speed is too low or fan doesn’t rotate
yes
no
Measure the
current of live wireon the main
board with a clamp ampere meter. Is the
current higher than the value of the
overcurrent protection?
Clean the indoor and outdoor heat exchangers
and remove the blockage of air inlet and outlet
Check the motor and reinstall the motor to have
the fan run normally
Malfunction is
eliminated
yes
Malfunction is
eliminated
yes
no
no
Replace the mainboard with the same model
yes
no
Is there blockage inside
the system? (Filth blockage, ice plug,
greasy blockage, the Y-valve hasn’t been opened
completely)
yes
Flush the heat exchangers with high pressure
nitrogen
Malfunction is
eliminated
yes
no
no
Is the compressor running
abnormally? Is there abnormal sound or oil
leakage; is the temperature of the shell
too high, etc.?
yes
Replace the mainboard with the same model
Malfunction is
eliminated
yes
no
no
Replace the mainboard with
the same model
End
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Troubleshooting
for U8 malfunction
Re-energize1
minute after
de-erergization
U8 is still
displayed
No
The unit returns to normal.
Conclusion:U8 is displayed due
to instant energization afte deenergization while the capacitor
discharges slowly.
Yes
The zero-cross detection
circuit of the mainboard is
defined abnormal.Replace
the mainboard with the same
model
End
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0DLQGHWHFWLRQSRLQWV
ƽ'HWHFWLIWKHYROWDJHRI/DQG1WHUPLQDORI;7ZLULQJERDUGLVEHWZHHQ9$&9$&E\DOWHUQDWLQJYROWDJHPHWHU
ƽ,VUHDFWRU/ZHOOFRQQHFWHG",VFRQQHFWLRQZLUHORRVHQHGRUSXOOHGRXW",VUHDFWRU/GDPDJHG"
Turn on the unit and
wait 1 minute
Use AC voltmeter to measure
the voltage on the two ends
of electrolytic capacitor
(see fig 30)
Voltage higher
than 200V?
Y
Malfunction of
the outdoor
mainboard AP1
Replace outdoor
mainboard
N
Measure the voltage
input with AC voltmeter
(see fig 30)
Voltage within
180VAC~260VAC?
N
Power supply is
abnormal; repair
the power supply
to restore the range
between 180VAC
~260VAC
Power on and
restart the unit
Is the Vmalfunction
eliminated?
Y
Y
Shut down the power and wait 20
minutes; or use DC voltmeter to
measure the voltage on the two
ends of electrolytic capacitor
until the voltage is lower than 20V
N
Check the connection
of reactor and connection
wire
If the wiring of
reactor L is normal?
N
Connect the
connection
wire of reactor
L correctly
Power on and
restart the unit
Is the Vmalfunction
eliminated?
Y
Y
Replace outdoor
mainboard AP1
N
End
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H5, H7 or P5 is
displayed after
turning on the unit
Measure if the voltage
input is within 180~265V
with AC voltmeter
(see fig 30)
N
Repair power supply to make
the power voltage normal
Y
The compressor
is well connected
with mainboard
AP1?
N
Adjust it properly
according to wiring
diagram 5.1
Y
Restart the unit
The unit starts
operation again
Y
Restart the unit
The unit starts
operation again
Y
Restart the unit
The unit starts
operation again
Y
N
Y
Clean the heat exchanger
to improve its performance
N
Check if system pressure
is too high?
The unit starts
operation again
N
Y
Heat exchanger is
blocked with dirt?
Restart the unit
N
Y
Adjust refrigerant
charging amount
N
Replace outdoor
mainboard AP1
Does the unit
work normally
Y
N
Replace compressor
End
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E8 is displayed
If the outdoor
ambient temperature is higher
than 53℃?
Y
N
If the radiating of indoor
and outdoor unit is good?
N
If the indoor and outdoor
fan are running normally?
Normal protection, please
use it after improving the
outdoor ambient temperature
Unit restarts
normally
Y
Unit restarts
normally
Y
N
Y
Improve the radiating environment
of unit (clean the heat exchanger
and remove surrounding obstacles)
N
Connect normally?
Y
Adjust the
connection
Y
Replace Fan
capacitor
Y
Replace Motor
Y
Y
Fan capacitor is broken?
Replace outdoor
mainboard
N
Motor is broken?
N
Replace mainboard
End
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Turn on the unit
If the stop time of compressor
is more than 3min?
If the compressor wire
COMP(UVW) is well connected and
connection sequence is correct?
The stop time is not sufficient and
the high and low pressure of system
is not balanced , please start the unit
after 3min
Check the connection situation
of outdoor mainboard AP1 and
compressor COMP, and the
connect it according to wiring
diagram
Does the unit
start up normally?
If the refrigerant charging
amount is too much?
Charge the refrigerant
according to service
manual
Does the unit
start up normally?
Replace outdoor
mainboard AP1
Is the malfunction
eliminated?
Replace the
compressor
End
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H3 or E4 is displayed
30min after power off the unit
If the overload protector SAT
is well connected?
N
Y
Under ambient temperature,
test the resistance of overload protector with ohmmeter;
resistance value should be<1000ohm
Y
N
N
If the wiring terminal FA of electronic
expansion valve is well connected?
Connect wire
according to wiring
diagram
Y
Replace EKV coil of electronic expansion valve
Is the malfunction
eliminated?
Y
Is the malfunction
eliminated?
Y
Is the malfunction
eliminated?
Y
Is the malfunction
eliminated?
Y
Is the malfunction
eliminated?
Y
N
Replace overload
protector SAT
Check the situation of refrigerant; if there is leakage,
please charge refrigerant according to the service
manual
N
Compressor overload protection terminal is not
connected well with the mainboard; reconnect
them correctly
N
Heat exchange of unit is not good (heat exchanger
is dirty and unit radiating environment is bad);
improve the radiating environment and clean the
heat exchanger
N
Too much load of the system causes high temperature
of compressor after working for a long time;
decrease the load for operation
N
Replace outdoor
mainboard AP1
End
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start
If power plug is connected
well with the socket
Y
Is the malfunction
eliminated?
Connect the plug correctly
N
Check the connection wire
between reactor mainboard
and situation of connection
N
If there is short circuit or the
connection wire is loose?
Y
Reconnect the wire or
replace the connection
wire according to the
wiring diagram.
Power on and
restart the unit
Is the malfunction
eliminated?
N
N
Check the surface of reactor coil
If it is damaged?
Y
Replace the reactor
Power on and
restart the unit
Is the malfunction
eliminated?
N
Replace outdoor
mainboard AP1
N
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If the unit operates normally
before malfunction
Check the connection
wire according to the
wiring diagram.
Check built-in wiring
of indoor and outdoor
unit
Replace the
wire
Is the malfunction
eliminated?
If the connection wire
is connected well?
Reconnect the wire or
replace the connection
wire according to the
wiring diagram.
If the wiring is
damaged?
Check the malfunction
type with communication
malfunction detector
Malfunction of outdoor
communication circuit
Replace indoor
mainboard AP2
Is the malfunction
eliminated?
Replace outdoor
mainboard AP1
Is the malfunction
eliminated?
End
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Start
Measure voltage at the
Test 10 position as
shown in the diagram
with a voltmeter
Value jumping
N
Y
Measure voltage at the
Test 15 position as
shown in the diagram
with a voltmeter
Y
Value jumping
N
Y
Fault with
outdoor unit
Measure voltage at the
Test 11 position as
shown in the diagram
with a voltmeter
Value jumping
End
N
Y
Measure voltage at the
Test 12 position as
shown in the diagram
with a voltmeter
N
Value jumping
Y
The communication
circuit of the outdoor
unit is normal
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Temp(ć ) Resistance(kΩ)
-19
138.1
-18
128.6
-17
121.6
-16
115
-15
108.7
-14
102.9
-13
97.4
-12
92.22
-11
87.35
-10
82.75
-9
78.43
-8
74.35
-7
70.5
-6
66.88
-5
63.46
-4
60.23
-3
57.18
-2
54.31
-1
51.59
0
49.02
1
46.6
2
44.31
3
42.14
4
40.09
5
38.15
6
36.32
7
34.58
8
32.94
9
31.38
10
29.9
11
28.51
12
27.18
13
25.92
14
24.73
15
23.6
16
22.53
17
21.51
18
20.54
19.63
19
Temp(ć ) Resistance(kΩ)
20
18.75
21
17.93
22
17.14
23
16.39
24
15.68
25
15
26
14.36
27
13.74
28
13.16
29
12.6
30
12.07
31
11.57
32
11.09
33
10.63
34
10.2
35
9.779
36
9.382
37
9.003
38
8.642
39
8.297
40
7.967
41
7.653
42
7.352
43
7.065
44
6.791
45
6.529
46
6.278
47
6.038
48
5.809
49
5.589
50
5.379
51
5.197
52
4.986
53
4.802
54
4.625
55
4.456
56
4.294
57
4.139
58
3.99
Temp(ć ) Resistance(kΩ)
59
3.848
60
3.711
61
3.579
62
3.454
63
3.333
64
3.217
65
3.105
66
2.998
67
2.896
68
2.797
69
2.702
70
2.611
71
2.523
72
2.439
73
2.358
74
2.28
75
2.206
76
2.133
77
2.064
78
1.997
79
1.933
80
1.871
81
1.811
82
1.754
83
1.699
84
1.645
85
1.594
86
1.544
87
1.497
88
1.451
89
1.408
90
1.363
91
1.322
92
1.282
93
1.244
94
1.207
95
1.171
96
1.136
97
1.103
Temp(ć )
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
Resistance(kΩ)
1.071
1.039
1.009
0.98
0.952
0.925
0.898
0.873
0.848
0.825
0.802
0.779
0.758
0.737
0.717
0.697
0.678
0.66
0.642
0.625
0.608
0.592
0.577
0.561
0.547
0.532
0.519
0.505
0.492
0.48
0.467
0.456
0.444
0.433
0.422
0.412
0.401
0.391
0.382
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Temp(ć ) Resistance(kΩ)
-19
181.4
-18
171.4
-17
162.1
-16
153.3
-15
145
-14
137.2
-13
129.9
-12
123
-11
116.5
-10
110.3
-9
104.6
-8
99.13
-7
94
-6
89.17
-5
84.61
-4
80.31
-3
76.24
-2
72.41
-1
68.79
0
65.37
1
62.13
2
59.08
3
56.19
4
53.46
5
50.87
6
48.42
7
46.11
8
43.92
9
41.84
10
39.87
11
38.01
12
36.24
13
34.57
14
32.98
15
31.47
16
30.04
17
28.68
18
27.39
19
26.17
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Temp(ć ) Resistance(kΩ)
20
25.01
21
23.9
22
22.85
23
21.85
24
20.9
25
20
26
19.14
27
18.13
28
17.55
29
16.8
30
16.1
31
15.43
32
14.79
33
14.18
34
13.59
35
13.04
36
12.51
37
12
38
11.52
39
11.06
40
10.62
41
10.2
42
9.803
43
9.42
44
9.054
45
8.705
46
8.37
47
8.051
48
7.745
49
7.453
50
7.173
51
6.905
52
6.648
53
6.403
54
6.167
55
5.942
56
5.726
57
5.519
58
5.32
Temp(ć ) Resistance(kΩ)
59
5.13
60
4.948
61
4.773
62
4.605
63
4.443
64
4.289
65
4.14
66
3.998
67
3.861
68
3.729
69
3.603
70
3.481
71
3.364
72
3.252
73
3.144
74
3.04
75
2.94
76
2.844
77
2.752
78
2.663
79
2.577
80
2.495
81
2.415
82
2.339
83
2.265
84
2.194
85
2.125
86
2.059
87
1.996
88
1.934
89
1.875
90
1.818
91
1.736
92
1.71
93
1.658
94
1.609
95
1.561
96
1.515
97
1.47
Temp(ć )
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
Resistance(kΩ)
1.427
1.386
1.346
1.307
1.269
1.233
1.198
1.164
1.131
1.099
1.069
1.039
1.01
0.983
0.956
0.93
0.904
0.88
0.856
0.833
0.811
0.77
0.769
0.746
0.729
0.71
0.692
0.674
0.658
0.64
0.623
0.607
0.592
0.577
0.563
0.549
0.535
0.521
0.509
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Temp(ć ) Resistance(kΩ)
-29
853.5
-28
799.8
-27
750
-26
703.8
-25
660.8
-24
620.8
-23
580.6
-22
548.9
-21
516.6
-20
486.5
-19
458.3
-18
432
-17
407.4
-16
384.5
-15
362.9
-14
342.8
-13
323.9
-12
306.2
-11
289.6
-10
274
-9
259.3
-8
245.6
-7
232.6
-6
220.5
-5
209
-4
198.3
-3
199.1
-2
178.5
-1
169.5
0
161
1
153
2
145.4
3
138.3
4
131.5
5
125.1
6
119.1
7
113.4
8
108
9
102.8
Temp(ć ) Resistance(kΩ)
10
98
11
93.42
12
89.07
13
84.95
14
81.05
15
77.35
16
73.83
17
70.5
18
67.34
19
64.33
20
61.48
21
58.77
22
56.19
23
53.74
24
51.41
25
49.19
26
47.08
27
45.07
28
43.16
29
41.34
30
39.61
31
37.96
32
36.38
33
34.88
34
33.45
35
32.09
36
30.79
37
29.54
38
28.36
39
27.23
40
26.15
41
25.11
42
24.13
43
23.19
44
22.29
45
21.43
46
20.6
47
19.81
48
19.06
Temp(ć ) Resistance(kΩ)
49
18.34
50
17.65
51
16.99
52
16.36
53
15.75
54
15.17
55
14.62
56
14.09
57
13.58
58
13.09
59
12.62
60
12.17
61
11.74
62
11.32
63
10.93
64
10.54
65
10.18
66
9.827
67
9.489
68
9.165
69
8.854
70
8.555
71
8.268
72
7.991
73
7.726
74
7.47
75
7.224
76
6.998
77
6.761
78
6.542
79
6.331
80
6.129
81
5.933
82
5.746
83
5.565
84
5.39
85
5.222
86
5.06
87
4.904
Temp(ć )
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
Resistance(kΩ)
4.754
4.609
4.469
4.334
4.204
4.079
3.958
3.841
3.728
3.619
3.514
3.413
3.315
3.22
3.129
3.04
2.955
2.872
2.792
2.715
2.64
2.568
2.498
2.431
2.365
2.302
2.241
2.182
2.124
2.069
2.015
1.963
1.912
1.863
1.816
1.77
1.725
1.682
1.64
1RWH7KHLQIRUPDWLRQDERYHLVIRUUHIHUHQFHRQO\
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2013 Johnson Controls, Inc.
www.johnsoncontrols.com
Doc. MUHJZHAMQ-130507
Johnson Controls reserve the right to change product features without prior notice.
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