Technical Information
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6. Diagnosis for overload and discharge malfunction (AP1 below is control board of outdoor unit)
Main detection point:
• Is the electron expansion valve connected securely? Is the expansion valve damaged?
• Is the refrigerant leaking?
• Is the overload protector damaged?
Malfunction diagnosis process:
20 minutes after the
complete unit is powered off
NO
Is the overload protector
SAT is well connected?
Under ambient temperature, test the
resistance of overload protector with ohmic
meter, resistance value 1000
ȍ
The resistance value of first 4 lead foot and
the fifth lead foot is similar, less than 100
ȍ
Is the wiring terminal FA
of electron expansion well
connected?
Replace EKV coil of electron
expansion valve
End
YES
If the fault is eliminated?
Replace control board AP1
NO
Connect wire securely with
wiring diagram?
NO
YES
YES
Check refrigerant, if there is leakage,
please refer to specification
If the fault is eliminated?
YES
YES
