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Midea R32 M thermal Arctic Mono fault codes

50 codes from the Midea manual for the R32 M thermal Arctic Mono heat pump. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
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
H5Room temperature sensor error
H6DC fan error
H7Abnormal main circuit voltage
H8Pressure sensor error
H9Zone 2 water outlet temperature sensor error
HAWater side heat exchanger water outlet temperature sensor error
HBPP protection three times in a row and twout < 7°C
HECommunication error between main board and thermostat transfer board
HFRefrigerant system EEPROM error
HHRepeated H6 protection lockout
HPRepeated low pressure protection lockout
L0Inverter module protection
L1DC bus low voltage protection
L2DC bus high voltage protection
L4MCE error
L5Zero speed protection
L8Compressor frequency variation greater than 15Hz within one second protection
L9Actual compressor frequency differs from target frequency by more than 15Hz protection
P0Suction pipe low pressure protection
P1High pressure protection
P3Compressor current protection
P4Discharge temperature protection
P5High temperature difference between water side heat exchanger water inlet and water...
PBWater side heat exchanger anti-freeze protection
PDHigh temperature protection of refrigerant outlet temperature of condenser in cooling mode
PPWater side heat exchanger inlet temperature is higher than outlet temperature in...