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95
Installation and Maintenance
Service Manual
7. Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit)
Main detection point:
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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 e ad fo ot an d th e
fif th lead foot is similar,
less than 100
After the unit
de-energized
for 20min
Remove
malfunction?
Yes
No
No
No
If the overload protector SAT
is well connected?
No
Under ambient temperature, test the
resistance of overload protector with ohmic
Yes
Yes
Replace
overload
protector SAT
No
Yes
Check refrigerant, if there is
leakage, please refer to
specification
Replace
control board
AP1
End