Gree GWH09TB-D3DNA1A Service Manual page 69

(6) 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:
N
Replace
overload
protector SAT
After the unit
de-energized
for 20min
If the overload protector SAT
is well connected?
Y
Under ambient temperature, test the
resistance of overload protector with ohmic
Y
If the wiring terminal FA of electron
expansion is well connected?
Y
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 EKV
coil of electron
expansion valve
Remove
malfunction?
N
Check refrigerant, if there is
leakage, please refer to
specification
Remove
malfunction?
N
Replace
control board
AP1
End
N
Connect wire
N well with wiring
diagram
Y