Midea ESG-Inv M Series - Page 58

ESG-Inv M
57
Part 5 – Diagnosis and Troubleshooting
5.23 P4 Troubleshooting
Digital display output
Procedure
P4: Compressor discharge temperature
too high protection
High pressure switch protection
Yes
Refer to P1 trouble shooting
No
Discharge temperature sensor is not
installed
Yes
Installed the discharge temperature
sensor
No
Discharge temperature sensor
1
connection on main PCB is loose
Yes
Ensure the sensor is connected properly
No
Discharge temperature sensor is affected
by moisture or water
Yes
Dry the sensor
No
Discharge Temperature sensor has short-
circuited or failed or big temperature
drift
Yes
Replace the sensor
No
Replace refrigerant system PCB
Notes:
1. Discharge temperature sensor (Tp) connection is port CN4 on the refrigerant system PCB.
Protection logic
Normal operation
Discharge temperature > 115°C
Discharge temperature < 95°C
Error code P3
MBT Confidential