Midea MDV-V80W/DN1

R410A All DC Inverter Mini VRF MCAC-VTSM-2014-10
92 Troubleshooting
7.12 P4: Compressor discharged temperature protection (for all models)
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
Check whether resistance of compressor discharged
temperature sensor is correct or not .
NO
Connect correctly again.
YES
Replace outdoor 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 confirm the
refrigerant volume again.
YES
YES