Gree GWH07AFAXA-K3NNA1A Service Manual page 75

7. Overload protection of compressor H3, high discharge temperature protection of compressor E4
(AP1 hereinafter refers to the control board of the outdoor unit)
Main detection points:
(1) electronic expansion valve (2) expansion valve terminal (3) charging amount of refrigerant (4) overload protector
Malfunction diagnosis process:
protector SAT
72
After the unit
de-energized
for 20min
If the overload protector SAT
iswell connected?
Under ambient temperature, test the
resistance of overload protector with
ohmic meter resistance value 1000Ω
If the wiring terminal FA of electron
N
expansion is well connected?
The resistance value of
first 4 lead foot and the
fifth lead foot is similar, less
than 100Ω
Replace
Replace EKV
overload
coil of electron
expansion valve
Remove
malfunction?
Check refrigerant, if there is
leakage, please refer to
specification
Remove
malfunction?
control board
N
N
Replace
AP1
End
N
Connect wire
well with wiring
N
diagram
Y
Installation and Maintenance
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