73
Troubleshooting
(7) Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit)
Main detectio
n point:
z If the electron expansion valve is connected well? Is the expansion valve damaged?
z If the refrigerant is leakage?
z 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
mulfunction?
The resistance value of
first 4 lead foot and the
fifth lead foot is similar,
small to 100
ƻ
Finish
fter the unit
de-energized
for 20min
Remove
mulfunction?
Y
N
N
N
If the overload protector SAT is
well connected?
N
Under ambient temperature, test the
resistance of overload protector with ohmic
meter, resistance value 1000ƻ
Y
Y
Replace
overload
protector SAT
N
Y
Check refrigerant, if there is
leakage, please refer to
specification
Replace
control board
AP1
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