Troubleshooting
Mainly detect:
Whether the electronic expansion valve is connected well or not? Is electronic expansion valve damaged? 
Is refrigerant leaked?
20 minutes after the complete unit is powered off
Is the terminal FA for the |
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electronic expansion valve |
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connected correctly? |
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Resistances between the first four pins close to the terminal hole and the fifth pin are almost the same, less than 100 ohm.
Replace the electronic expansion valve
If the fault is eliminated?
Replace the control panel AP1
If the fault is eliminated? 
Coolant leakage, refilling the coolant
End
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