P4:Compressordischargedtemperatureprotection
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.
LED displays P4
Discharged temperature protection 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
Check whether resistance of compressor discharged
temperature sensor is correct or not .
NO
Connect correctly again.
YES
Replace outdoor main PCB
Whether the discharged temperature sensor is damaged or not.
NO
Replace compressor discharged
temperature sensor.
Check refrigerant leaks or not.
Stop leaking and then add the refrigerant again.
YES
YES
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