6. Overload and air exhaust malfunction diagnosis (following AP1 for outdoor unit control board)
Mainly detect:
• Is the PMV connected securely or not? Is PMV damaged?
• Is refrigerant leaked?
Fault diagnosis process:
20 minutes after the
complete unit is powered off
NO
Is the terminal FA for the
electronic expansion valve
connected correctly?
Resistances between the
first four pins close to the
terminal hole and the fifth
pin are almost the same, less
than 100 ohm.
Is fault is eliminated?
Replace the electronic
expansion valve
Replace the
control panel AP1
End
YES
Is fault is eliminated?
Coolant leakage, refilling the
coolant
NO
Connect the wires correctly?
NO
YES
YES
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