M thermal Split
78 202004
Midea M thermal Split
4.18 P4 Troubleshooting
Digital display output 4.18.1
Description 4.18.2
Discharge temperature protection.
When the compressor the discharge temperature rises above 115°C, the system displays P4 protection and M thermal
Split stops running. When the discharge temperature falls below 95°C, P4 is removed and normal operation resumes.
Error code is displayed on refrigerant system main PCB and user interface.
Possible causes 4.18.3
Temperature sensor error
High pressure side blockage.
Poor condenser heat exchange.
Outdoor unit main PCB damaged.
Midea CAC
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