52
Installation and Maintenance
Service Manual
No. Malfunction Name
Display Method of
Indoor Unit
A/C status
Possible Causes
Dual-8 Code
Display
28
Charging
malfunction of capacitor
PU
During cooling and drying operation, compressor
will stop while indoor fan will operate;
During heating operation, the complete unit will
stop
Refer to the part three—charging malfunction
analysis of capacitor
29
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
30
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 it's no use, please replace control panel
AP1.
31
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)
32
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.
33
Module temperature is too
high
P8
During cooling and drying operation, compressor
and outdoor fan stop while indoor fan operates.
During heating operation, all loads stop.
Radiating grease on IPM module of
outdoor unit main board is not enough;
screws have not been fixed tightly;
Hardware malfunction of outdoor unit main board;
34
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.
35
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.
36
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
9. Maintenance
