Air Conditioner Service Manual
41
3) Check the system pressure, recharge refrigerant if the pressure is low, and discharge some
refrigerant if the pressure is too high.
4) Check the outdoor ventilation and if there is any obstruction that affects the normal radiating of the air
conditioner, and installation again.
5) If the above inspections are normal, but the fault remains unsolved, please replace the outdoor PCB.
Re-energize and check the protection code on display. Firstly display P9.
a) Check the U,V, W connection, if is correctness or loose please connect again.
b) If this code is displayed when the compressor is started for several seconds or even not started,
check the compressor connection for correctness, if no insert wrong, replace outdoor PCB.
8.3.8
Display EU
.
Reason:
Voltage sensor damage.
Solution: Please replace outdoor PCB.
8.3.9
Display EE
Reason:
EEPROM fault.
Solution:
Shut down power supply and reenergize it, if the fault remains there, check the EEPROM
installation, if no problem, please replace outdoor PCB.
8.3.10 Display E4
Reason:
System abnormal
.
Solution:
1. Check the operation pressure to check the gas whether enough.
2. If the gas not enough, please add gas
.
3. If the gas enough, please replace indoor PCB
Fixing screw
U, V, W connection
Heat radiation problem easily happened
while the screw is not fixed tightly.
Voltage sensor
EEPROM