Midea MHC-V12W/D2RN8-B - Page 107

M thermal Mono
202004 105
4.25 PP Troubleshooting
Digital display output
Description
 Water side heat exchanger inlet temperature is higher than outlet temperature in heating mode.
 M thermal Mono stops running.
 Error code is displayed on hydronic system main control board for refrigerant system and user interface.
 If PP error occurs 3 times then Hb will appear.
Possible causes
 Temperature sensor not connected properly or has malfunctioned.
 4-way valve is blocked or damaged.
 Hydronic system main PCB damaged.
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