M thermal Mono
202008 79
4.22 PP Troubleshooting
Digital display output 4.22.1
Description 4.22.2
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 PCB and user interface.
Hb indicates PP has displayed 3 times.
Possible causes 4.22.3
Temperature sensor not connected properly or has malfunctioned.
4-way valve is blocked or damaged.
Hydronic system main PCB damaged.
Midea CAC
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