Gree GWH12UB-K3DNA4F Service Manual page 78

Service Manual
7. Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit)
Main detection point:
● If the electron expansion valve is connected well? Is the expansion valve damaged?
● If the refrigerant is leakage?
● If the overload protector is damaged?
Malfunction diagnosis process:
Installation and Maintenance
After the unit
de-energized
for 20min
If the overload protector SAT
is well connected?
Under ambient temperature, test the
resistance of overload protector with ohmic
If the wiring terminal FA of electron
No
expansion is well connected?
The resistance value of
firs t 4 l e ad fo ot an d th e
fif th lead fo ot is similar,
less than 100
Replace
Replace EKV
overload
coil of electron
protector SAT
expansion valve
Remove
malfunction?
Check refrigerant, if there is
leakage, please refer to
specification
Remove
malfunction?
control board
Yes
Yes
Yes
No
No
Replace
AP1
End
No
Connect wire
well with wiring
No
diagram
Yes
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