42
Installation and Maintenance
Service Manual
Malfunction of module
temperature sensor
circuit
P7
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop
Replace outdoor control panel AP1
Module high
temperature
protection
P8
During cooling operation, compressor will
stop while indoor fan will operate; During
heating operation, the complete unit will
stop
After the complete unit is de-energized for 20mins, check
whether the thermal grease on IPM Module of outdoor
control panel AP1 is sufficient and whether the radiator is
inserted tightly. If its no use, please replace control panel
AP1.
Overload protection
for compressor
H3
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)
IPM protection
H5
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop operation.
Refer to the malfunction analysis (IPM protection, loss of
synchronism protection and overcurrent protection of phase
current for compressor.
Malfunction of zero-
cross detection circuit
U8
The complete unit stops
1.Power supply is abnormal;
2.Detection circuit of indoor control mainboard is abnormal.
Internal motor (fan
motor) do not operate
H6
Internal fan motor, external fan motor,
compressor and electric heater stop
operation,guide louver stops at present
location.
1. Bad contact of DC motor feedback terminal.
2. Bad contact of DC motor control end.
3. Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard revdetecting circuit.
Desynchro-nizing of
compressor
H7
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop operation.
Refer to the malfunction analysis (IPM protection, loss of
synchronism protection and overcurrent protection of phase
current for compressor.
PFC protection
HC
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop operation.
Refer to the malfunction analysis
Outdoor DC fan motor
malfunction
L3
Outdoor DC fan motor malfunction lead to
compressor stop operation,
DC fan motor malfunction or system blocked or the connector
loosed
power protection
L9
compressor stop operation and Outdoor
fan motor will stop 30s latter , 3 minutes
latter fan motor and compressor will restart
To protect the electronical components when detect high
power
Indoor unit and
outdoor unit doesnt
match
LP
compressor and Outdoor fan motor cant
work
Indoor unit and outdoor unit doesnt match
Failure start-up
LC
During cooling and drying operation,
compressor will stop while indoor fan will
operate;
During heating operation, the complete
unit will stop operation.
Refer to the malfunction analysis
Defrosting
Heating
indicator
off for
0.5s and
then
blinks
for 10s
Defrosting will occur in heating mode.
Compressor will operate while indoor fan
will stop operation.
Not the error code. It’s the status code for the operation
The four-way valve is
abnormal
U7
If this malfunction occurs during heating
operation, the complete unit will stop
operation.
1.Supply voltage is lower than AC175V;
2.Wiring terminal 4V is loosened or broken;
3.4V is damaged, please replace 4V.
