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9. Maintenance
9.1 Error Code List
Malfunction
Error
No.
Name
Code
High pressure
1
E1
protection
Freeze
2
E2
protection
Low pressure
3
protection of
E3
compressor
High discharge
t e m p e r a t u r e
4
E4
protection
of compressor
O v e r c u r r e n t
5
E5
protection
Heating
indicator
off for
6
Defrosting
0.5s and
then
blinks for
10s
46
A/C Status
1. The main board and the display panel are not connected well.
2. The OVC terminal on main board is not connected well with the high
pressure switch on the complete unit.
During cooling and drying
3. The wiring of high pressure switch is loosened.
operation, except indoor
4. Refrigerant is superabundant.
fan operates, all loads
5. Poor heat exchange (including blocked heat exchanger and bad radiating
stop operation. During
environment ).
heating operation, if it is
6. Ambient temperature is too high.(if it is 3-phase unit, the high pressure
inverter unit, the complete
protection may be caused by overcurrent protection due to this reason)
unit stops; if it is floor
7. The supply voltage is abnormal.(if it is 3-phase unit, the high pressure
standing unit, the complete
protection may be caused by overcurrent protection due to this reason)
unit stops and operation
8. The air intake and air discharge at indoor / outdoor heat exchanger are not
of remote controller or
smooth. The air cycle is short circuited.
controller is unavailable.
9. Filter and heat exchange fins of indoor/outdoor units are blocked.
10. The system pipeline is blocked.
11. The gas valve and liquid valve for outdoor unit are not completely opened.
12. The OVC input is at high level.
1. Poor air-return in indoor unit.
During cooling and drying
2. Abnormal fan speed.
operation,compressor and
3. Dirty evaporator.
outdoor fan stop while
4. System is normal, but the indoor tube temperature sensor is abnormal, or
indoor fan operates.
the tube temperature sensor is not connected well.
1. The main board and display panel are not connected well.
2. The LPP terminal on the main board is not connected well with the high
pressure switch on the complete unit.
The complete unit
3. The wiring of the high pressure switch is loosened. High pressure
stops
switch is damaged or poorly contacted.
4. Insufficient or leaking out refrigerant.
5. The LPP input is at high level.
During cooling and drying
1. Abnormal system (e.g.: blockage, etc)
operation, compressor
2. Abnormal rotation speed of outdoor motor (cooling )
and outdoor fan stop while
3. Abnormal air intake (cooling)
indoor fan operates. During
4. System is normal, but the compressor discharge temperature
heating operation,all loads
sensor is abnormal or poorly contacted.
stop.
1. Unstable supply voltage. Normal fluctuation shall be within 10% of the
rated voltage on the nameplate.
2. Supply voltage is too low and load is too high.
3. Measure the current of live wire on main board. If the current isn't higher
During cooling and drying
than the overcurrent protection value, please check the controller.
operation, compressor and
4. The indoor and outdoor heat exchangers are too dirty, or the air inlet and
outdoor fan stop while
air outlet are blocked.
indoor fan operates. During
5. The fan motor is not running. Abnormal fan speed: fan speed is too low or
heating operation, all loads
the fan doesn't run.
stop.
6. The compressor is not running normally. There is abnormal sound, oil
leakage or the temperature of the shell is too high, etc.
7. There's blockage in the system. (filth blockage, ice plug, greasy
blockage, Y-valve hasn't beenopened completely)
Not the error code. It's
the status code for the
operation
Possible Causes
Installation and Maintenance
Service Manual
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