M thermal Mono
202008 63
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
Mono stops running. When the discharge temperature falls below 90°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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