Sinclair SDV4 series - Page 75

Troubleshooting 85
4.11 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 90°C , the unit resumes normal
operation automatically.
LED displays P4
Discharged temperature of the compressor
Check whether the discharged temperature of the compressor is higher
than 115°C.
NO
Check whether the compressor discharged
temperature sensor connects with PCB
correctly according to the wiring diagram.
YES
Judge: check whether resistance of compressor
discharged temperature sensor is correct or not .
NO
Connect correctly again.
YES
Replace outdoor PCB
Judge: whether the discharged temperature sensor
is damaged or not.
NO
Replace compressor discharged
temperature sensor.
Check refrigerant leaks or not.
Stop leaking and then confirm the
refrigerant volume again.
YES
YES