Mitsubishi Air Conditioner Error Codes

AC BrandsMitsubishi Electric

Mitsubishi Electric Fault Code Check List Index:

Mitsubishi Air Conditioning Error Codes
Mitsubishi Air Conditioning Error Codes
  1. Mitsubishi Mr Slim P Series (A) Error Codes
  2. Mitsubishi Mr Slim P Series (K) Error Codes
  3. Mitsubishi Multi City VRF Error Codes
  4. Mitsubishi Ecodan Error Codes
  5. Mitsubishi PWFY Series Error Codes
  6. Mitsubishi CAHV Error Codes
  7. Operation Light Flashing
  8. Troubleshooting

1-Mitsubishi Electric Mr Slim P Series (A) Error Codes

Mr. Slim P-Series ductless heat pumps and air conditioners are compact yet powerful, offering unrivaled energy efficiency and design flexibility. Their advanced technology has been designed and tested to withstand the extremes of the Canadian climate in order to deliver a reliable and proven climate control system that you can trust all year round. With a variety of models to choose from, there’s a P-Series solution for any commercial application.

Check CodeDiagnosis of malfunction
A0Duplicate address - Lossnay units attached with the same address - change addresses and reset the units power
A2Hardware error of transmission processor (Lossnay) - check comms wiring, and for possible Lossnay board fault
A3Line busy no data could be transmitted for 8 minutes - check A- M-Net connections (TB7 and TB3)
A6Communication error with communication processor - Lossnay address not transmitted - check M-Net voltage
A7No ACK signal - check A- M-Net wiring, range of transmission wiring exceeded or if faulty A- M-Net converter
A8M-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
EAMis-wiring/loose inter-connecting cables. Noise interference
EBMis-wiring/loose interconnecting cables. Noise interference. Wrong cable size/spec
ECStart-up time over. The unit has failed to initialise after power up. Noise interference. Wrong cable size/spec
EDSerial communication error. Comms error between boards on outdoor unit caused by M-Net interface board incorrectly fitted
EFNon-defined error code. Noise interference - power down outdoor unit for 30 seconds then switch back on
E0Remote controller communication error - check wiring, connections and comms voltage. Also check Master/Slave settings if multiple systems are connected
E1Remote controller issue - if grouped, check addressing. If twinned, check wired to master indoor only
E2Remote controller issue - if grouped, check addressing. If twinned, check wired to master indoor only
E3Remote controller issue - not transmitting - if grouped, check addressing. If twinned check wired to master indoor only
E4Remote controller issue - not receiving - if grouped, check addressing. If twinned, check wired to master indoor only
E5Remote controller issue - not receiving - if grouped, check addressing. If twinned, check wired to master indoor only
E6Indoor/outdoor communication error, mainly caused by outdoor unit being powered up before indoor unit. Drain pump being wired into S1 and S2 causes interference
E7Comms 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
E8Comms 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
E9Comms failure indoor to outdoor (S2/S3) - check pumps wired in, check indoor isolator and re-power in correct sequence i.e. indoor then outdoor
FA51CM connector open - check thermal relay for disconnection or contact failure. Possible defective board
F1Reverse phase detection - check power supply, try swapping 2 phases round. Possible defective board
F2L3 phase open - check power supply, also check for open circuit protection devices

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