Mitsubishi AC Error Codes | Solution
Mitsubishi AC Error Codes | Solution
Mitsubishi AC Error Codes | Solution
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Mitsubishi AC Error Code A0 Solution Duplicate address – Lossnay units attached with the same address – change addresses and reset the units power
Mitsubishi AC Error Code A2 Solution Hardware error of transmission processor (Lossnay) – check comms wiring, and for possible Lossnay board fault
Mitsubishi AC Error Code A3 Solution Line busy no data could be transmitted for 8 minutes – check A- M-Net connections (TB7 and TB3)
Mitsubishi AC Error Code A6 Solution Communication error with communication processor – Lossnay address not transmitted – check M-Net voltage
Mitsubishi AC Error Code A7 Solution No ACK signal – check A- M-Net wiring, range of transmission wiring exceeded or if faulty A- M-Net converter
Mitsubishi AC Error Code A8 Solution M-Net no response – check A- M-Net wiring, range of transmission wiring exceeded, faulty A- M-Net converter or if incorrect wire used for M-Net connection
Mitsubishi AC Error Code EA Solution Mis-wiring/loose inter-connecting cables. Noise interference
Mitsubishi AC Error Code EB Solution Mis-wiring/loose interconnecting cables. Noise interference. Wrong cable size/spec
Mitsubishi AC Error Code EC Solution Start-up time over. The unit has failed to initialise after power up. Noise interference. Wrong cable size/spec
Mitsubishi AC Error Code ED Solution Serial communication error. Comms error between boards on outdoor unit caused by M-Net interface board incorrectly fitted
Mitsubishi AC Error Code EF Solution Non-defined error code. Noise interference – power down outdoor unit for 30 seconds then switch back on
Mitsubishi AC Error Code E0 Solution Remote controller communication error – check wiring, connections and comms voltage. Also check Master/Slave settings if multiple systems are connected
Mitsubishi AC Error Code E1 Solution Remote controller issue – if grouped, check addressing. If twinned, check wired to master indoor only
Mitsubishi AC Error Code E2 Solution Remote controller issue – if grouped, check addressing. If twinned, check wired to master indoor only
Mitsubishi AC Error Code E3 Solution Remote controller issue – not transmitting – if grouped, check addressing. If twinned check wired to master indoor only
Mitsubishi AC Error Code E4 Solution Remote controller issue – not receiving – if grouped, check addressing. If twinned, check wired to master indoor only
Mitsubishi AC Error Code E5 Solution Remote controller issue – not receiving – if grouped, check addressing. If twinned, check wired to master indoor only
Mitsubishi AC Error Code E6 Solution Indoor/outdoor communication error, mainly caused by outdoor unit being powered up before indoor unit. Drain pump being wired into S1 and S2 causes interference
AC Error Code E7 Solution 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
AC Error Code E8 Solution 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
AC Error Code E9 Solution 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
AC Error Code FA Solution 51CM connector open – check thermal relay for disconnection or contact failure. Possible defective board
AC Error Code F1 Solution Reverse phase detection – check power supply, try swapping 2 phases round. Possible defective board
AC Error Code F2 Solution L3 phase open – check power supply, also check for open circuit protection devices
AC Error Code F3 Solution 63L open – check low pressure switch for disconnection or contact failure. Possible defective board
AC Error Code F4 Solution 49C open – compressor inner thermostat for open circuit or contact failure
AC Error Code F5 Solution 63H open – check high pressure switch for disconnection or contact failure. Possible defective board
AC Error Code F7 Solution Phase detection circuit fault – faulty outdoor board
AC Error Code F8 Solution No input detected at outdoor unit – outdoor board defective
AC Error Code F9 Solution Two or more protection devices are open – check protection devices for disconnection or contact failure
AC Error Code P1 Solution Return air thermistor fault (TH1) – check if TH1 disconnected or open or close circuit
AC Error Code P2 Solution Liquid pipe thermistor fault (TH2) check if TH2 disconnected or open or close circuit
AC Error Code P4 Solution Drain sensor fault – DS open or close circuit
AC Error Code P5 Solution High condensate level – drain pump failure or blockage in the drain
AC Error Code P6 Solution Freezing/Overheating of indoor unit heat exchanger – mainly caused by reduced air flow through indoor coil. Dirty filters. Fan motor problem. Blockage
AC Error Code P8 Solution Abnormal pipe temperature – mainly caused by refrigerant leakage. Possibility that the thermistor mounted incorrectly
AC Error Code P9 Solution TH5 condenser/evaporator thermistor open/close circuit. Disconnected from the board
AC Error Code U1 Solution High pressure trip – outdoor fan failure, blocked coil, blockage in the system, blocked filters on indoor in heating etc
AC Error Code U2 Solution High discharge temperature – compressor over heating due to lack of refrigerant, faulty thermistor, high ambient running conditions. Can also be caused by 49C (comp inner thermostat or external Klixon ) tripping
AC Error Code U3 Solution Discharge thermistor fault
AC Error Code U4 Solution Outdoor thermistor fault
AC Error Code U5 Solution Inverter heat sink temperature too high (TH8) – check for lack of air flow around heat sink, no silicone paste, faulty thermistor (temperature can be read from service tool (or PAR21 on power inverter model))
AC Error Code U6 Solution Compressor over current – carry out inverter output test and electrical checks to the compressor
AC Error Code U7 Solution Low discharge superheat – check TH4 reading is correct. Check LEV operations
AC Error Code ho –Solution For about 2 minustes following power-on, operation of the remote controller is not possible deu to system start-up. – Connector for the outdoor unit’s protection device is not connected. -Reserve or open phase wiring for the outdoor unit’s power terminal block (L1,L2,L3). -Incorrect wiring between indoor and outdoor units (incorrect polarity of S1,S2,S3). -Remote controller wire short.
AC Error Code FF-FF0 Solution No unit. Buzzer sound: Triple beep. Operation Led: No lit.
AC Error Code U0-UP Solution Outdoor unit error.
AC Error Code F1-FA Solution Outdoor unit error.
AC Error Code E0-E5 Solution Signal error between remote controller and indoor units.
AC Error Code E6-EF Solution Communication error between indoor and outdoor units.
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