Sinclair SCV-50EA Service Manual page 81

P3: Compressor current protection
It will protect when input current is more than 22A(31A for 10-16kW ). It will recover when input current is less than 22A
(31A for 10-16kW ). It will recover automatically.
Compressor current protection
Check whether the input current of the power wire is more than 22A.
Check cooling system is normal or not.
Check whether the outdoor ambient temperature is too high.
Check whether the outdoor unit ventilates well.
`
Whether the heat exchanger needs cleaning or not.
If the refrigerant pipe is blocked or not?
Whether the circulation water pump is damaged.
Whether plate heat exchanger is fouling or blocked severely
Replace main PCB.
LED displays P3
(31A for 10-16kW )
YES
YES
NO
NO
NO
NO
NO
NO NO
NO
79
NO
YES
YES
Make
ventilates well.
YES
Clean heat exchanger.
YES Remove the refrigerant pipe and then use high
pressure nitrogen or refrigerant to blow the pipe.
Vacuumed the pipe then add the refrigerant again.
YES
Repair or replace the water pump
YES
Clean or replace heat exchanger.
Replace main PCB
Stop the unit.
the outdoor unit