46
Installation and Maintenance
Service Manual
9.1 Error Code List
9. Maintenance
No.
Malfunction
Name
Error
Code
A/C Status Possible Causes
1
High pressure
protection
E1
During cooling and drying
operation, except indoor
fan operates, all loads
stop operation. During
heating operation, if it is
inverter unit, the complete
unit stops; if it is floor
standing unit, the complete
unit stops and operation
of remote controller or
controller is unavailable.
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.
3. The wiring of high pressure switch is loosened.
4. Refrigerant is superabundant.
5. Poor heat exchange (including blocked heat exchanger and bad radiating
environment ).
6. Ambient temperature is too high.(if it is 3-phase unit, the high pressure
protection may be caused by overcurrent protection due to this reason)
7. The supply voltage is abnormal.(if it is 3-phase unit, the high pressure
protection may be caused by overcurrent protection due to this reason)
8. The air intake and air discharge at indoor / outdoor heat exchanger are not
smooth. The air cycle is short circuited.
9. Filter and heat exchange ns 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.
2
Freeze
protection
E2
During cooling and drying
operation,compressor and
outdoor fan stop while
indoor fan operates.
1. Poor air-return in indoor unit.
2. Abnormal fan speed.
3. Dirty evaporator.
4. System is normal, but the indoor tube temperature sensor is abnormal, or
the tube temperature sensor is not connected well.
3
Low pressure
protection of
compressor
E3
The complete unit
stops
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.
3. The wiring of the high pressure switch is loosened. High pressure
switch is damaged or poorly contacted.
4. Insufcient or leaking out refrigerant.
5. The LPP input is at high level.
4
High discharge
temperature
protection
of compressor
E4
During cooling and drying
operation, compressor
and outdoor fan stop while
indoor fan operates. During
heating operation,all loads
stop.
1. Abnormal system (e.g.: blockage, etc)
2. Abnormal rotation speed of outdoor motor (cooling )
3. Abnormal air intake (cooling)
4. System is normal, but the compressor discharge temperature
sensor is abnormal or poorly contacted.
5
Overcurrent
protection
E5
During cooling and drying
operation, compressor and
outdoor fan stop while
indoor fan operates. During
heating operation, all loads
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
than the overcurrent protection value, please check the controller.
4. The indoor and outdoor heat exchangers are too dirty, or the air inlet and
air outlet are blocked.
5. The fan motor is not running. Abnormal fan speed: fan speed is too low or
the fan doesn’t run.
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. (lth blockage, ice plug, greasy
blockage, Y-valve hasn’t beenopened completely)
6 Defrosting
Heating
indicator
off for
0.5s and
then
blinks for
10s
Not the error code. It’s
the status code for the
operation
To Next Page
Loading...
