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SERVICE MANUAL
SERVICE MANUAL
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:
Connect wire
well with wiring
diagram
Replace EKV
coil of electron
expansion valve
If the wiring terminal FA of electron
expansion is well connected?
Remove
malfunction?
The resistance value of
firs t 4 l ead fo ot an d th e
fif th lead foot is similar,
less than 100
After the unit
de-energized
for 20min
Remove
malfunction?
Y
N
N
N
If the overload protector SAT
is well connected?
N
Under ambient temperature, test the
resistance of overload protector with ohmic
Y
Y
Replace
overload
protector SAT
N
Y
Check refrigerant, if there is
leakage, please refer to
specification
Replace
control board
AP1
End
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