Air Conditioner Service Manual
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10.5.7 Display E9（first display P0 or P9）
Reason: Outdoor PCB drive circuit damage.
Solution:
Re-energize and check the protection code on display. Firstly display P0.
1) 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.
2) Check if the outdoor module is tightly installed onto the radiating fins and if the silicone is applied
evenly, fix the screws again if loose.
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 Compressor 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.
10.5.8 Display EU.
Reason: Voltage sensor damage.
Solution: Please replace outdoor PCB.
Compressor U,V,W connection
Fixing screw
Compressor U, V, W connection
Heat radiation problem easily happened
while the screw is not fixed tightly.
Voltage sensor
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