Gree GWH18TC-S3DNA1D Service Manual page 81

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:
78
After the unit
de-energized
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
N
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
malfunction?
Check refrigerant, if there is
leakage, please refer to
specification
malfunction?
control board
for 20min
Yes
Yes Y
Yes Y
Remove
N
No
Remove
No
N
Replace
AP1
End
N
No
Connect wire
well with wiring
N
No
diagram
Yes Y
Installation and Maintenance
Service Manual