Mitsubishi Fault Codes

Mr.Slim A-control error code list

Display of remote controller

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

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

Code EC
Error detail Start-up time over
Inspected unit Outdoor.

Code E6
Error detail Indoor/outdoor unit transmission error (signal receiving error).
Inspected unit Indoor.

Code E7
Error detail Indoor/outdoor unit transmission error (transmitting error).
Inspected unit Indoor.

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

Code E9
Error detail Indoor/outdoor unit transmission error (transmitting error).
Inspected unit Outdoor.

Code E0 Error detail Remote control transmission error (signal receiving error)
Inspected unit Remote control

Code E3
Error detail Remote control transmission error (transmitting error)
Inspected unit Remote control.

Code E4
Error detail Remote control transmission error (signal receiving error)
Inspected unit Indoor.

Code E5
Error detail Remote control transmission error (transmitting error)
Inspected unit Indoor.

Code EF
Error detail M-NET transmission error
Inspected unit Indoor and outdoor.

Code Ed
Error detail Serial transmission error
Inspected unit Outdoor.

Code P1
Error detail Abnolmality of room temperature thermistor (TH1).
Inspected unit Indoor.

Code P2
Error detail Abnormality of pipe temperature themistor/liquid (TH2).
Inspected unit Indoor.

Code P4
Error detail Abnomarlity of drain sensor (DS)
Inspected unit Indoor.

Code P5
Error detail Malfunction of drain-up machine.
Inspected unit Indoor.

Code P6
Error detail Freezing/overheating protection detect.
Inspected unit Indoor.

Code P8
Error detail Abnormality of pipe temperature.
Inspected unit Indoor.

Code P9
Error detail Anormality of pipe temperature thermistor/condenser/evaporator (TH5)
Inspected unit Indoor.

Code F1
Error detail Reverse phase detection.

Code F2
Error detail L3 open phase detection.

Code F3
Error detail 63L connector open.

Code F4
Error detail 49C connector open.

Code F9
Error detail Connector 2 or more open.

Code FA
Error detail L2-phased open phase or 51CM connector open.

Code F7
Error detail Reverse phase detection circuit (p.c.board) fault.

Code F8
Error detail Input circuit fault.

Code U2
Error detail Abnormal high discharging temperature.

Code U2
Error detail Inner thermostat (49C) operation.

Code U1
Error detail Abnormal high pressure (high pressure swicth 63H worked)

Code U1
Error detail Direct cut operation.

Code UE
Error detail High pressure error (ball valve closed)

Code UL
Error detail Abnormal low pressure.

Code Ud
Error detail Over heat protection

Code U6
Error detail Compressor over current (overload) cut off.

Code UA
Error detail Compressor over current (terminal relay operation).

Code UF
Error detail Compressor over current (start-up locked) cut off.

Code UF
Error detail Compressor over current (operating locked) cut off.

Code UH
Error detail Current sensor error.

Code U3
Error detail Discharge thermistor short/open.

Code U4
Error detail Outdoor thermistor short/open.

Mr.Slim K-control
Display of remote controller

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

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

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

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

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

LED P6
Diagnosis of malfunction Abnomality of the coil frost/overheating protection mode.
Inspected unit Indoor.

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

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

LED P8
Diagnosis of malfunction Outdoor unit malfunction
Inspected unit Outdoor.

Mr.Slim K-control PUH-EK
Outdoor unit

LED ON = Operation status
LED Flash = Check code diplay

LED LD1
LED ON Compressor directive
LED Flash Reverse phase detect

LED LD2
LED ON Heating directive
LED Flash Open phase detect

LED LD3
LED ON During 63H1 operation
LED Flash Pipe sensor short/open

LED LD4
LED ON Compressor ON
LED Flash High pressure swicth (63H2) operation.

LED LD5
LED ON Outdoor fan ON
LED Flash Over current relay (51CM) operation.

LED LD6
LED ON 4-way valve ON
LED Flash Thermal swicth (26C) operation.

LED LD7
LED ON Bypass valve ON
LED Flash Thermistor (TH3) overheat protection.

LED LD8
LED ON Crankcase heater ON
LED Flash Devective input.

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