Mitsubishi Inverter Air Conditioning Error Codes
Mitsubishi A6 Communication error with communication processor
Mitsubishi EA Mis-wiring/loose inter-connecting cables. Noise interference
Mitsubishi EB Mis-wiring/loose interconnecting cables.
Mitsubishi EC Start-up time over. The unit has failed to initialise after power up.
Mitsubishi ED Serial communication error.
Mitsubishi EF Non-defined error code. Noise interference - power down outdoor unit for 30 seconds then switch back on
Mitsubishi E0 Remote controller communication error - check wiring, connections and comms voltage.
Mitsubishi E1 Remote controller issue -check wired to master indoor only
Mitsubishi E2 Remote controller issue check wired to master indoor only
Mitsubishi E3 Remote controller issue - not transmitting check wired to master indoor only
Mitsubishi E4 Remote controller issue - n, check wired to master indoor only
Mitsubishi E5 Remote controller issue, check wired to master indoor only
Mitsubishi E6 Indoor/outdoor communication error,
Mitsubishi E7 Comms fault between I/C and O/C - check for condensate pump at I/C, reset power to O/C, check 12/24Vdc on S2 and S3 possible I/C board failure
Mitsubishi E8 Comms failure indoor to outdoor (S2/S3) - check pumps wired in, check indoor isolator and re-power in the correct sequence i.e. indoor then outdoor
Mitsubishi E9 Comms failure indoor to outdoor (S2/S3) - check pumps wired in, check indoor isolator and re-power in correct sequence i.e. indoor then outdoor
Mitsubishi FA 51CM connector open -
Mitsubishi F1 Reverse phase detection -
Mitsubishi F2 L3 phase open - check power supply, also check for open circuit protection devices
Mitsubishi F3 63L open - check low pressure switch for disconnection or contact failure.
Mitsubishi F4 49C open - compressor inner thermostat for open circuitor contact failure
Mitsubishi F5 63H open - check high pressure switch for disconnectionor contact failure.
Mitsubishi F7 - faulty outdoor board
Mitsubishi F8 outdoor board defective
Mitsubishi P1 Return air thermistor fault (TH1) -
Mitsubishi P2 Liquid pipe thermistor fault (TH2) check if TH2 disconnected or open or close circuit
Mitsubishi P4 Drain sensor fault
Mitsubishi P5 High condensate level - drain pump failure
Mitsubishi P6 reduced air flow through indoor coil. Dirty filters. Fan motor problem. Blockage
Mitsubishi P8 mainly caused by refrigerant leakage
Mitsubishi P9 TH5 condenser/evaporator thermistor open
Mitsubishi U1 outdoor fan failure, blocked coil, blockage in the system, blocked filters on indoor in heating
Mitsubishi U2 compressor over heating due to lack of refrigerant,
Mitsubishi U3 Discharge thermistor fault
Mitsubishi U4 Outdoor thermistor fault
Mitsubishi U5 Inverter heat sink temperature too high (TH8)
Mitsubishi U6 Compressor over current
Mitsubishi U7 Low discharge superheat
Mitsubishi A6 Communication error with communication processor
Mitsubishi EA Mis-wiring/loose inter-connecting cables. Noise interference
Mitsubishi EB Mis-wiring/loose interconnecting cables.
Mitsubishi EC Start-up time over. The unit has failed to initialise after power up.
Mitsubishi ED Serial communication error.
Mitsubishi EF Non-defined error code. Noise interference - power down outdoor unit for 30 seconds then switch back on
Mitsubishi E0 Remote controller communication error - check wiring, connections and comms voltage.
Mitsubishi E1 Remote controller issue -check wired to master indoor only
Mitsubishi E2 Remote controller issue check wired to master indoor only
Mitsubishi E3 Remote controller issue - not transmitting check wired to master indoor only
Mitsubishi E4 Remote controller issue - n, check wired to master indoor only
Mitsubishi E5 Remote controller issue, check wired to master indoor only
Mitsubishi E6 Indoor/outdoor communication error,
Mitsubishi E7 Comms fault between I/C and O/C - check for condensate pump at I/C, reset power to O/C, check 12/24Vdc on S2 and S3 possible I/C board failure
Mitsubishi E8 Comms failure indoor to outdoor (S2/S3) - check pumps wired in, check indoor isolator and re-power in the correct sequence i.e. indoor then outdoor
Mitsubishi E9 Comms failure indoor to outdoor (S2/S3) - check pumps wired in, check indoor isolator and re-power in correct sequence i.e. indoor then outdoor
Mitsubishi FA 51CM connector open -
Mitsubishi F1 Reverse phase detection -
Mitsubishi F2 L3 phase open - check power supply, also check for open circuit protection devices
Mitsubishi F3 63L open - check low pressure switch for disconnection or contact failure.
Mitsubishi F4 49C open - compressor inner thermostat for open circuitor contact failure
Mitsubishi F5 63H open - check high pressure switch for disconnectionor contact failure.
Mitsubishi F7 - faulty outdoor board
Mitsubishi F8 outdoor board defective
Mitsubishi P1 Return air thermistor fault (TH1) -
Mitsubishi P2 Liquid pipe thermistor fault (TH2) check if TH2 disconnected or open or close circuit
Mitsubishi P4 Drain sensor fault
Mitsubishi P5 High condensate level - drain pump failure
Mitsubishi P6 reduced air flow through indoor coil. Dirty filters. Fan motor problem. Blockage
Mitsubishi P8 mainly caused by refrigerant leakage
Mitsubishi P9 TH5 condenser/evaporator thermistor open
Mitsubishi U1 outdoor fan failure, blocked coil, blockage in the system, blocked filters on indoor in heating
Mitsubishi U2 compressor over heating due to lack of refrigerant,
Mitsubishi U3 Discharge thermistor fault
Mitsubishi U4 Outdoor thermistor fault
Mitsubishi U5 Inverter heat sink temperature too high (TH8)
Mitsubishi U6 Compressor over current
Mitsubishi U7 Low discharge superheat
