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Midea M-Thermal Arctic HT R290 Mono fault codes

73 codes from the Midea manual for the M-Thermal Arctic HT R290 Mono heat pump. Pick one for what it means, the likely causes and where to start.

CodeWhat it means
BAT4 sensor out of operation range protection
C2IBH (internal backup heater) related fault
C7Over-high temperature protection for IPM module
D0Oil return operation active
E0Water flow failure
E1Phase loss or phase reversal
E3T1 electric heater/AHS water outlet temperature sensor error
E4T5 water tank temperature sensor error
E5T3 outdoor unit heat exchanger bottom temperature sensor error
E6T4 ambient temperature sensor error
E7Tbt balance tank temperature sensor/final outlet water temperature of cascade system...
E8Water flow protection
E9Th return-air temperature sensor error
EALow discharge temperature protection
EBTsolar solar panel temperature sensor error
ECT5_2 water tank temperature sensor error (reserved)
F1Protection for DC bus undervoltage
F75Protection for insufficient discharge overheating degree
FC1TL outdoor unit heat exchanger outlet temperature sensor error
H1Communication error between main control PCB and inverter PCB
H2T2 plate heat exchanger outlet refrigerant temperature sensor error
H3T2B plate heat exchanger inlet refrigerant temperature sensor error
H4Repeated L1* protection (3 times in 60 mins)
H5Ta room temperature sensor error
H6DC fan motor protection
H7Compressor voltage protection
H9Tw2 zone 2 water flow temperature sensor error
HATw_out plate heat exchanger outlet water temperature sensor error
HBRepeated PP protection in heating/DHW mode
HDCommunication fault between master unit and slave unit
HFOutdoor unit EEPROM error
HHRepeated DC fan motor protection lockout
HPLow pressure protection in cooling mode
L11Phase current instantaneous overcurrent protection
L12Phase current continuous 30s overcurrent protection
L1EHardware overcurrent protection
L2EOver-temperature protection
L31Bus voltage too high error
L32Inverter module protection code (digital display L32)
L34Inverter module protection code (digital display L34)
L3EBus voltage too low error
L43Inverter module protection code (digital display L43)
L45Inverter module protection code (digital display L45)
L46Inverter module protection code (digital display L46)
L47Inverter module protection code (digital display L47)
L52Inverter module protection code (digital display L52)
L5EInverter module protection code
L61Inverter module protection code (digital display L61)
L65Inverter module protection code (digital display L65)
L6EInverter module protection code
LB7Inverter module protection code (digital display Lb7)
LBEInverter module protection code (digital display LbE)
LC1Inverter module protection code (digital display LC1)
LC2Inverter module protection code (digital display LC2)
LC3Inverter module protection code (digital display LC3)
LC4Inverter module protection code (digital display LC4)
LC5Inverter module protection code (digital display LC5)
LC6Inverter module protection code (digital display LC6)
LC7Inverter module protection code (digital display LC7)
LC8Inverter module protection code (digital display LC8)
LC9Inverter module protection code (digital display LC9)
LCAInverter module protection code (digital display LCA)
LCBInverter module protection code (digital display LCb)
LCCInverter module protection code (digital display LCC)
LCDInverter module protection code (digital display LCd)
LCEInverter module protection code (digital display LCE)
P0Low pressure protection
P1High pressure protection
P3Compressor current protection
P4High discharge temperature protection
P5The big temperature difference between outlet water temp. and inlet water temp
PBWater side heat exchanger anti-freeze protection
PPProtection for abnormal temperature difference between outlet water and inlet water