Midea R32 M thermal Arctic Mono fault PB
Water side heat exchanger anti-freeze protection
Heat pumpWhat it means
Error code 31. Anti-freeze protection for water side heat exchanger detected by user interface and hydronic system main PCB.
Likely causes
- Low water flow or insufficient water volume in system
Where to start
- Verify water pump operation during protection cycle
- Verify water pump operation and flow rate
- Step 1: Check if water flow switch connection (CN8) on hydronic system main PCB is loose
The full answer, free
- 7 more checks in order
- The readings and component tests from the manual
- How to put it right, step by step
- The manual page for this fault (page 68), right under the answer
Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.
From the Midea manual for the R32 M thermal Arctic Mono. Check the model on the data plate before you order parts.
Other Midea R32 M thermal Arctic Mono fault codes
- BHPED board checking fail
- C7Transducer module temperature too high protect
- D0Oil return operation in progress
- E0Water flow failure (repeated E8 occurrence)
- E1Phase sequence error
- E2Communication error between outdoor unit and user interface
- E3Backup electric heater water outlet temperature sensor error
- E4Domestic hot water tank temperature sensor error
- E5Air side heat exchanger refrigerant outlet temperature sensor error
- E6Outdoor ambient temperature sensor error
- E7Balance tank sensor Tbt1 error
- E8Water flow failure
- E9Suction pipe temperature sensor error
- EADischarge pipe temperature sensor error
- EBSolar board sensor tsolar error
- ECBalance tank sensor Tbt2 error
- EDWater side heat exchanger water inlet temperature sensor error
- EEHydronic system EEPROM error
- ELCommunication fault between hydraulic module and MH-kit
- F1DC bus voltage is too low
- H0Communication error between refrigerant system main control chip and hydronic system...
- H1Communication error between refrigerant system main control chip and inverter driver chip
- H2Water side heat exchanger refrigerant inlet (liquid pipe) temperature sensor error
- H3Water side heat exchanger refrigerant outlet temperature sensor error