Sinclair SCV-50EA Service Manual page 82

P4: Compressor discharged temperature protection
When the discharged temperature of the compressor is higher than 115°C, the unit will stop running. When the
discharged temperature of the compressor is lower than 83°C , the unit resumes normal operation automatically.
Discharged temperature protection of the compressor
Check whether the discharged temperature of the compressor is higher than 115°C.
Check whether the compressor discharged
temperature sensor connects with PCB correctly
according to the wiring diagram.
Whether the discharged temperature sensor is damaged or not.
Check whether resistance of compressor discharged
temperature sensor is correct or not .
Replace outdoor main PCB
LED displays P4
NO
YES
YES
80
NO
Connect correctly again.
Check refrigerant leaks or not.
Stop leaking and then add the refrigerant again.
NO
Replace
temperature sensor.
YES
YES
compressor discharged