Mitsubishi Error Code Search

Error code search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code.

Caution:

If molded case circuit breakers or earth leakage circuit breakers have tripped, do not reset the breaker immediately without first checking for any problems with the insulation of equipment.

Resetting breakers without a check of insulation may cause damage to equipment.

Mitsubishi Air Conditioning Codes:

CODE: P1
RESULT: Intake sensor error.

CODE: P2 – P9
RESULT: Pipe (Liquid or 2-phase pipe) sensor error.

CODE: E6 – E7
RESULT: Indoor/outdoor unit communication error.

CODE: P4
RESULT: Drain sensor error.

CODE: P5
RESULT: Drain pump error.

CODE: PA
RESULT: Forced compressor error.

CODE: P6
RESULT: Freezing/Overheating safeguard operation.

CODE: EE
RESULT: Communication error between indoor and outdoor units.

CODE: P8
RESULT : Pipe temperature error.

CODE: E4
RESULT: Remote controller signal receiving error.

CODE: Fb
RESULT : Indoor unit control system error (memory error, etc.)

CODE: E0 – E3
RESULT: Remote controller transmission error.

CODE: E1 – E2
RESULT: Remote controller control board error.
For details, check the LED display of the outdoor controller board.

CODE: E9
RESULT: Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit).

CODE: UP
RESULT: Compressor overcurrent interruption.

CODE: U3 – U4
RESULT: Open/short of outdoor unit thermistors.

CODE: UF
RESULT: Compressor overcurrent interruption (When compressor locked).

CODE: PA
RESULT: Forced compressor error.

CODE: U2
RESULT: Abnormal high discharging temperature/49C worked/insufficient refrigerant.

CODE: U1- Ud
RESULT : Abnormal high pressure (63H worked)/Overheating safeguard operation.

CODE: U5
RESULT: Abnormal temperature of heat sink.

CODE: U8
RESULT: Outdoor unit fan safeguard stop.

CODE: U6
RESULT: Compressor overcurrent interruption/Abnormal of power module.

CODE: U7
RESULT: Abnormality of super heat due to low discharge temperature.

CODE: U9 – UH
RESULT: Abnormality such as over-voltage or voltage shortage and abnormal synchronous signal to main circuit/ Current sensor error.

Mr.Slim A-Control Error Code List – Display of remote controller

CODE: EA
RESULT: Error detail Mis-wiring of indoor/outdoor unit. exceed the number of indoor unit connection. Inspected unit Outdoor..

CODE: Eb
RESULT: Error detail Mis-wiring of indoor/outdoor unit. (mis-wiring disconnection) Inspected unit Outdoor.

CODE: EC
RESULT: Error detail Start-up time over. Inspected unit Outdoor.

CODE: E6
RESULT: Error detail Indoor/outdoor unit transmission error (signal receiving error). Inspected unit Indoor..

CODE: E7
RESULT: Error detail Indoor/outdoor unit transmission error (transmitting error). Inspected unit Indoor.

CODE: E8
RESULT: Error detail Indoor/outdoor unit transmission error (signal receiving error). Inspected unit Outdoor.

CODE: E9
RESULT: Error detail Indoor/outdoor unit transmission error (transmitting error). Inspected unit Outdoor.

CODE: E0
RESULT: Error detail Remote control transmission error (signal receiving error). Inspected unit Remote control

CODE: E3
RESULT: Error detail Remote control transmission error (transmitting error). Inspected unit Remote control.

CODE: E4
RESULT: Error detail Remote control transmission error (signal receiving error). Inspected unit Indoor.

CODE: E5
RESULT: Error detail Remote control transmission error (transmitting error). Inspected unit Indoor.

CODE: EF
RESULT: Error detail M-NET transmission error. Inspected unit Indoor and outdoor.

CODE: Ed
RESULT: Error detail Serial transmission error. Inspected unit Outdoor.

CODE: P1
RESULT: Error detail Abnormality of room temperature thermistor (TH1). Inspected unit Indoor.

CODE: P2
RESULT: Error detail Abnormality of pipe temperature thermistor/liquid (TH2). Inspected unit Indoor.

CODE: P4
RESULT: Error detail Abnomarlity of drain sensor (DS). Inspected unit Indoor.

CODE: P5
RESULT: Error detail Malfunction of drain-up machine. Inspected unit Indoor.

CODE: P6
RESULT: Error detail Freezing/overheating protection detect. Inspected unit Indoor.

CODE: P8
RESULT: Error detail Abnormality of pipe temperature. Inspected unit Indoor.

CODE: P9
RESULT: Error detail A-normality of pipe temperature thermistor/condenser/evaporator (TH5). Inspected unit Indoor.

CODE: F1
RESULT: Error detail Reverse phase detection.

CODE: F2
RESULT: Error detail L3 open phase detection.

CODE: F3
RESULT: Error detail 63L connector open.

CODE: F4
RESULT: Error detail 49C connector open.

CODE: F9
RESULT: Error detail Connector 2 or more open.

CODE: FA
RESULT: Error detail L2-phased open phase or 51CM connector open.

CODE: F7
RESULT : Error detail Reverse phase detection circuit (p.c.board) fault.

CODE: F8
RESULT: Error detail Input circuit fault.

CODE: U2
RESULT: Error detail Abnormal high discharging temperature.

CODE: U2
RESULT: Error detail Inner thermostat (49C) operation.

CODE: U1
RESULT: Error detail Abnormal high pressure (high pressure switch 63H worked)

CODE: U1
RESULT: Error detail Direct cut operation.

CODE: UE
RESULT: Error detail High pressure error (ball valve closed)

CODE: UL
RESULT : Error detail Over heat protection.

CODE: Ud
RESULT: Error detail Over heat protection

CODE: U6
RESULT: Error detail Compressor over current (overload) cut off.

CODE: UA
RESULT: Error detail Compressor over current (terminal relay operation).

CODE: UF
RESULT: Error detail Compressor over current (start-up locked) cut off.

CODE: UF
RESULT: Error detail Compressor over current (operating locked) cut off.

CODE: UH
RESULT: Error detail Current sensor error.

CODE: U3
RESULT: Error detail Discharge thermistor short/open.

CODE: U4
RESULT: Error detail Outdoor thermistor short/open.

Mr.Slim K-Control Display Of Remote Controller.

CODE: LED E0
RESULT: Diagnosis of malfunction Transmitting/receiving signal error. Inspected unit Indoor.

CODE: LED P1
RESULT: Diagnosis of malfunction Intake air sensor abnormal. Inspected unit Indoor.

CODE: LED P2
RESULT: Diagnosis of malfunction Pipe sensor abnormal. Inspected unit Indoor.

CODE: LED P4
RESULT: Diagnosis of malfunction Drain sensor abnormal. Inspected unit Indoor.

CODE: LED P5
RESULT: Diagnosis of malfunction Malfunctioning of the drain overflow protecting mechanism. Inspected unit Indoor.

CODE: LED P6
RESULT: Diagnosis of malfunction Abnormality of the coil frost/overheating protection mode. Inspected unit Indoor.

CODE: LED E0
RESULT: Diagnosis of malfunction Transmitting/receiving signal error. Inspected unit Indoor.

CODE: LED P3
RESULT: Diagnosis of malfunction System error (transmitting/receiving signal). Inspected unit Indoor.

CODE: LED P7
RESULT: Diagnosis of malfunction System error (address). Inspected unit Indoor.

CODE: LED E8
RESULT: Diagnosis of malfunction Outdoor unit malfunction. Inspected unit Outdoor.

Mr.Slim K-Control Outdoor Unit

LED ON = Operation status
LED Flash = Check code display

CODE: LED LD1
RESULT: LED ON Compressor directive, LED Flash Reverse phase detect

CODE: LED LD2
RESULT: LED ON Heating directive , LED Flash Open phase detect

CODE: LED LD3
RESULT: LED ON During 63H1 operation , LED Flash Pipe sensor short/open

CODE: LED LD4
RESULT: LED ON Compressor ON , LED Flash High pressure switch (63H2) operation.

CODE: LED LD5
RESULT: LED ON Outdoor fan ON , LED Flash Over current relay (51CM) operation.

CODE: LED LD6
RESULT: LED ON 4-way valve ON , LED Flash Thermal switch (26C) operation.

CODE: LED LD7
RESULT: LED ON Bypass valve ON , LED Flash Thermistor (TH3) overheat protection.

CODE: LED LD8
RESULT: LED ON Crankcase heater ON , LED Flash Detective input.

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