Getting an error code on your Mitsubishi AC unit? There are multiple model numbers of Mitsubishi AC air conditioner units. We have the error codes for Mr. Slim P series A and K. Also you will find the error codes for the CITY MULTI and ECODAN in chart form below. Once you know and understand the error code that is displayed, you can then troubleshoot the system and find out which part or component needs to be replaced or repaired. This will save you money in the long run by replacing the AC parts yourself. For more Mitsubishi Split AC System Support see here and Error Code Lookup. Extra Help: Here is the link to the Mitsubishi AC App on iTunes. Here is the Mitsubishi AC App on the Google Play Store.
Mitsubishi AC Error Codes
Mitsubishi PWFY AC air conditioners error codes PDF
Mitsubishi CAHV AC air conditioners error codes
Mitsubishi AC Manual Directory – Manuals For ALL Mitsubishi AC Models
How Does The Average Air Conditioner Work?
MITSUBISHI MR SLIM P SERIES (A) AIR CONDITIONER ERROR CODES
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A0
CENTRAL CONTROLLER: 6600
PROBLEM WITH AC UNIT: Duplicate address – Lossnay units attached with the same address – change addresses and reset the units power
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A2
CENTRAL CONTROLLER: 6602
PROBLEM WITH AC UNIT: Hardware error of transmission processor (Lossnay) – check comms wiring and for possible Lossnay board fault
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A3
CENTRAL CONTROLLER: 6603
PROBLEM WITH AC UNIT: Line busy no data could be transmitted for 8 minutes – check A- M-Net connections (TB7 and TB3)
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A6
CENTRAL CONTROLLER: 6606
PROBLEM WITH AC UNIT: Communication error with communication processor – Lossnay address not transmitted – check M-Net voltage
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A7
CENTRAL CONTROLLER: 6607
PROBLEM WITH AC UNIT: No ACK signal – check A- M-Net wiring, range of transmission wiring exceeded or if faulty A- M-Net converter
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: A8
CENTRAL CONTROLLER: 6608
PROBLEM WITH AC UNIT: 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 MR SLIM P SERIES (A) ERROR CODE: EA
CENTRAL CONTROLLER: 6844
PROBLEM WITH AC UNIT: PROBLEM WITH AC UNIT: Mis-wiring/loose inter-connecting cables. Noise interference
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: EB
CENTRAL CONTROLLER: 6845
PROBLEM WITH AC UNIT: Mis-wiring/loose interconnecting cables. Noise interference. Wrong cable size/spec
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: EC
CENTRAL CONTROLLER: 6846
PROBLEM WITH AC UNIT: Start-up time over. The unit has failed to initialise after power up. Noise interference. Wrong cable size/spec
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: ED
CENTRAL CONTROLLER: 403
PROBLEM WITH AC UNIT: Serial communication error. Comms error between boards on outdoor unit caused by M-Net interface board incorrectly fitted
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: EF
CENTRAL CONTROLLER: 6607
PROBLEM WITH AC UNIT: Non-defined error code. Noise interference – power down outdoor unit for 30 seconds then switch back on
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E0
PROBLEM WITH AC UNIT: Remote controller communication error – check wiring, connections and comms voltage. Also check Master/Slave settings if multiple systems are connected
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E1
PROBLEM WITH AC UNIT: Remote controller issue – if grouped, check addressing. If twinned, check wired to master indoor only
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E2
PROBLEM WITH AC UNIT: Remote controller issue – if grouped, check addressing. If twinned, check wired to master indoor only
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E3
PROBLEM WITH AC UNIT: Remote controller issue – not transmitting – if grouped, check addressing. If twinned check wired to master indoor only
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E4
PROBLEM WITH AC UNIT: Remote controller issue – not receiving – if grouped, check addressing. If twinned, check wired to master indoor only
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E5
PROBLEM WITH AC UNIT: Remote controller issue – not receiving – if grouped, check addressing. If twinned, check wired to master indoor only
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E6
CENTRAL CONTROLLER: 6840
PROBLEM WITH AC UNIT: 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
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: E7
PROBLEM WITH AC UNIT: 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 MR SLIM P SERIES (A) ERROR CODE: E8
CENTRAL CONTROLLER: 6840
PROBLEM WITH AC UNIT: 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 MR SLIM P SERIES (A) ERROR CODE: E9
CENTRAL CONTROLLER: 6841
PROBLEM WITH AC UNIT: 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 MR SLIM P SERIES (A) ERROR CODE: FA
CENTRAL CONTROLLER: 4108
PROBLEM WITH AC UNIT: 51CM connector open – check thermal relay for disconnection or contact failure. Possible defective board
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F1
CENTRAL CONTROLLER: 4103
PROBLEM WITH AC UNIT: Reverse phase detection – check power supply, try swapping 2 phases round. Possible defective board
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F2
CENTRAL CONTROLLER: 4102
PROBLEM WITH AC UNIT: L3 phase open – check power supply, also check for open circuit protection devices
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F3
CENTRAL CONTROLLER: 5202
PROBLEM WITH AC UNIT: 63L open – check low pressure switch for disconnection or contact failure. Possible defective board
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F4
CENTRAL CONTROLLER: 4124
PROBLEM WITH AC UNIT: 49C open – compressor inner thermostat for open circuit or contact failure
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F5
CENTRAL CONTROLLER: 5201
PROBLEM WITH AC UNIT: 63H open – check high pressure switch for disconnection or contact failure. Possible defective board
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F7
CENTRAL CONTROLLER: 4118
PROBLEM WITH AC UNIT: Phase detection circuit fault – faulty outdoor board
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F8
PROBLEM WITH AC UNIT: No input detected at outdoor unit – outdoor board defective
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: F9
CENTRAL CONTROLLER: 4119
PROBLEM WITH AC UNIT: Two or more protection devices are open – check protection devices for disconnection or contact failure
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P1
PROBLEM WITH AC UNIT: Return air thermistor fault (TH1) – check if TH1 disconnected or open or close circuit
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P2
PROBLEM WITH AC UNIT: Liquid pipe thermistor fault (TH2) check if TH2 disconnected or open or close circuit
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P4
PROBLEM WITH AC UNIT: Drain sensor fault – DS open or close circuit
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P5
PROBLEM WITH AC UNIT: High condensate level – drain pump failure or blockage in the drain
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P6
PROBLEM WITH AC UNIT: Freezing/Overheating of indoor unit heat exchanger – mainly caused by reduced air flow through indoor coil. Dirty filters. Fan motor problem. Blockage.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P8
PROBLEM WITH AC UNIT: Abnormal pipe temperature – mainly caused by refrigerant leakage. Possibility that the thermistor mounted incorrect
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: P9
PROBLEM WITH AC UNIT: TH5 condenser/evaporator thermistor open/close circuit. Disconnected from the board.
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: U1
CENTRAL CONTROLLER: 1302
PROBLEM WITH AC UNIT: High pressure trip – outdoor fan failure, blocked coil, blockage in the system, blocked filters on indoor in heating
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: U2
CENTRAL CONTROLLER: 1102
PROBLEM WITH AC UNIT: 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
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: U3
CENTRAL CONTROLLER: 5104
PROBLEM WITH AC UNIT: Discharge thermistor fault
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: U4
CENTRAL CONTROLLER: 5105
PROBLEM WITH AC UNIT: Outdoor thermistor fault
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: U5
CENTRAL CONTROLLER: 4230
PROBLEM WITH AC UNIT: 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
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: U6
CENTRAL CONTROLLER: 4250
PROBLEM WITH AC UNIT: Compressor over current – carry out inverter output test and electrical checks to the compressor
MITSUBISHI MR SLIM P SERIES (A) ERROR CODE: U7
CENTRAL CONTROLLER: 1520
PROBLEM WITH AC UNIT: Low discharge superheat – check TH4 reading is correct. Check LEV operations
Error Codes And Central Controller Code Charts For Mitsubishi AC Units are below…
Mitsubishi AC Air Conditioner Parts and Replacements
Mitsubishi PWFY AC air conditioners error codes PDF
Mitsubishi CAHV AC air conditioners error codes
Mitsubishi AC Manual Directory – Manuals For ALL Mitsubishi AC Models
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