Midea MHC-V4W/D2N8-B - Page 81

M thermal Mono
202004 79
4.18 P4 Troubleshooting
Digital display output
Description
 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 95°C, P4 is removed and normal operation
resumes.
 Error code is displayed on refrigerant system main control board for refrigerant system and user interface.
Possible causes
 Temperature sensor error
 High pressure side blockage.
 Poor condenser heat exchange.
 Main PCB damaged.
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