Sinclair SDV4 series - Page 74

84 Troubleshooting
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4.10 P3: Compressor current protection
It will protect when input current is more than 15A. It will recover when input current is less than 15A.
It will recover automatically.
LED displays P3
Input current protection
Judge 1: check whether the input current of the power wire is
more than 15A.
Check cooling system is normal or not.
YES
Judge 2: Check whether the outdoor ambient temperature is
too high.
YES
Stop the unit.
NO
NO
Judge 3: check whether the outdoor unit ventilates well.
YES
Make the outdoor unit
ventilates well.
NO
Judge 4: whether the heat exchanger needs cleaning or not.
YES
Clean heat exchanger.
NO
Judge 5: if the refrigerant pipe is blocked or not?
YES
Remove the refrigerant pipe and then use
high pressure nitrogen or refrigerant to blow
the pipe. Vacuume the pipe then add the
refrigerant again.
Replace the outdoor PCB.