Mitsubishi Error Codes R410A System

ERROR CODES – R410A
Black = All R410A
Red = FD Split 1, 2 Series R410A
Blue = KX4 & KXR4 Series R410A
(does not cover SRK & SCM MODELS)


Error Code = No Indication
Indoor Circuit Board
Red LED = stays off
Green LED = keep flashing
Outdoor Circuit Board
Red LED = stays off
Green LED = keep flashing
Detail Of Fault = normal operation

Error Code = No Indication
Indoor Circuit Board
Red LED = stays off
Green LED = stays off
Outdoor Circuit Board
Red LED = stays off
Green LED = stays off
Detail Of Fault
• No mains power detected [power off or power failure].
• L phase wire is open circuit

Error Code = No Indication
Indoor Circuit Board
Red LED = Flashes 3 times
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• Remote controller wires - X & Y connections are reversed.
• Remote controller wires - Y & Z connections are reversed.
• Remote controller wiring is open circuit. (X wire broken - a beep is produced and no indication is made. Z wire broken -no beep and no indication).

Error Code = LCD Flashes continuously or Off
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Detail Of Fault = • Open Circuit or poor indoor/outdoor interconnecting wiring.

Error Code = E1
Indoor Circuit Board
Red LED = Stays Off
Green LED = Off or On continuously
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault = • Indoor circuit board or CPU failure.

Error Code = E1
Indoor Circuit Board
Red LED = Off or On continuously
Green LED = Off or On continuously
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault = • Indoor circuit board or CPU failure.

Error Code = E1
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• In group control, power supply to at least one indoor unit off
• Remote controller wire Y is open circuit
• Remote controller wires X and Y are reversed
• Faulty Indoor or Remote controller PCB
• Electrical noise interference

Error Code = E1
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• Remote controller wiring connected to A and B
• A and B wiring connected in closed loop
• Indoor unit PCB processor runs away

Error Code = E1
Indoor Circuit Board
Red LED = Flashes 3 times
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault = • Remote controller wiring open circuit

Error Code = E2
Indoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• Duplication of indoor unit address.
• More than 49 indoor units are connected on a network

Error Code = E3
Indoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Stays Off
Detail Of Fault = • No mains power at outdoor unit [power off or power failure].

Error Code = E3
Indoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault = • Incorrect address setting of the outdoor unit

Error Code = E3
Indoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = On or Stays Off
Green LED = Undefined
Detail Of Fault = • No mains power at outdoor unit [power off or power failure]

Error Code = E5
Indoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Detail Of Fault = • Outdoor/Indoor communication error

Error Code = E5
Indoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Stays Off
Detail Of Fault
• Outdoor unit control PCB failure
• Inverter parts faulty

Error Code = E5
Indoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Stays Off
Detail Of Fault
• The outdoor power unit failure (where indoor/outdoor power supplies are separated)
• Indoor/outdoor communication error
• A and B wiring reversed after power on

Error Code = E5
Indoor Circuit Board
Red LED = Flashes Twice
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing or irregular
Detail Of Fault = • Outdoor unit microcomputer failure

Error Code = E6
Indoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• Indoor unit heat exchanger sensor [ThIR] defective (resistance is open circuit or closed circuit).
• Poor connection of sensor connector on the indoor PCB.

Error Code = E7
Indoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED =
Green LED = Keeps Flashing
Detail Of Fault
• Indoor unit return sensor [ThIA] defective (resistance is open circuit or closed circuit).
• Poor connection of sensor connector on the indoor PCB.

Error Code = E8
Indoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• Overload in heating (extraordinarily high indoor heat exchanger temperature).
• Indoor unit heat exchanger sensor [ThIR] failure (resistance of sensor is closed circuit).

Error Code = E9
Indoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• Drain motor [DM] failure (drain motor open circuit or the drain motor is disconnected from the indoor PCB).
• Condensate still detected in drain tray (the drain motor can not remove the condensate – blockage in discharge pipe or condensate returning to drain tray).
• Float switch stuck in high position.
• Defective float switch input circuit on indoor PCB.
• Defective drain motor output circuit on indoor PCB.

Error Code = E10
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault = • 17 or more indoor units are connected to one remote controller (maximum permitted: 16 indoor units)

Error Code = E11
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault = • More than one indoor unit is connected to a remote controller while trying to address the unit from the remote controller.

Error Code = E12
Indoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• One or more units (indoor or outdoor) are still addressed at 48 or 49 [factory setting]
• While trying to auto address, one or more of the units (either indoor or outdoor) is not set at 49.
• Auto address is not possible on the system you are commissioning (Auto address is only possible on a single KX2 system).

Error Code = E14
Indoor Circuit Board
Red LED = Flashes 3 times
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault
• Incorrect setting of SW5 on indoor unit PCB when setting up a master / slave system.
• Incorrect control wiring between master and slave(s) [XYZ].
• Open circuit of control wiring between master and slave(s).

Error Code = E16
Indoor Circuit Board
Red LED = Stays off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays off
Green LED = Keeps Flashing
Detail Of Fault = • Faulty indoor fan motor

Error Code = E16
Indoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays off
Green LED = Keeps Flashing
Detail Of Fault = • Faulty indoor fan motor

Error Code = E28
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Detail Of Fault = • Failure of the sensor within the remote controller.

Error Code = E30
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Indoor/outdoor unit connected error.

Error Code = E31
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault
• Duplication of an indoor unit address number (U00 – U47).
• Outdoor unit address setting error

Error Code = E32
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault
• The anti phase device has detected that two phases of the mains power need to be swapped.
• The [L2] phase of the mains power (primary side of contactor) has been detected as open phase.

Error Code = E34
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault
• Abnormally low current (or no current) detected by [CT] on L3.
• Open phase detected at L3 (secondary side of contactor).

Error Code = E35
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault
• Outdoor unit heat exchanger sensor [ThOR] defective (resistance is open circuit or closed circuit).
• Poor connection of sensor connector on the outdoor unit PCB.

Error Code = E35
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault = • Cooling high pressure

Error Code = E36
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault
• The discharge temperature is abnormally high.
• Insufficient refrigerant.
• Compressor discharge temperature sensor [ThOD] defective

Error Code = E37
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault
• Outdoor unit heat exchanger sensor [ThOR] defective (resistance is open circuit).
• Poor connection of sensor connection on outdoor unit PCB

Error Code = E37
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = One time Flash
Green LED = Keeps Flashing
Detail Of Fault = Outdoor heat exch thermistor failure (Tho-R1)

Error Code = E37
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Two time Flash
Green LED = Keeps Flashing
Detail Of Fault = Outdoor heat exch thermistor failure (Tho-R2)

Error Code = E37
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Three time Flash
Green LED = Keeps Flashing
Detail Of Fault = Outdoor heat exch thermistor failure (Tho-R3)

Error Code = E37
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Four time Flash
Green LED = Keeps Flashing
Detail Of Fault = Outdoor heat exch thermistor failure (Tho-R4)

Error Code = E37
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Five time Flash
Green LED = Keeps Flashing
Detail Of Fault = Outdoor heat exch thermistor failure (Tho-SC)

Error Code = E37
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Six time Flash
Green LED = Keeps Flashing
Detail Of Fault = Outdoor heat exch thermistor failure (Tho-H)

Error Code = E38
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault
• Outside air temperature sensor [ThoA] defective (resistance is open circuit).
• Poor connection of sensor connection on outdoor unit PCB.

Error Code = E39
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault
• Compressor discharge temperature sensor [ThOD] defective (resistance is open circuit).
• Poor connection of sensor connection on outdoor unit PCB.

Error Code = E40
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault
• The high-pressure switch [63H or 63H1] has tripped.
• System overcharged with refrigerant.
• One (or more) of the service valves is shut.
• Insufficient airflow (or no airflow) over the condensercoil

Error Code = E41
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault = • The power transistor for the inverter has overheated

Error Code = E42
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault = • Abnormally high current detected in compressor.

Error Code = E43
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault = • The maximum number of indoor units connected to one outdoor unit has been exceeded.

Error Code = E45
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes Once
Green LED = Keeps Flashing
Detail Of Fault
• Transmission error between inverter and outdoor unit PCB.
• Loose connection of [CnI]

Error Code = E46
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Off
Green LED = Keeps Flashing
Detail Of Fault
• There is a conflict of address settings.
• A combination of: automatic / manual / remote control addresses coexist on one network

Error Code = E47
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Inverter over voltage

Error Code = E48
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • DC Outdoor Fan motor fault

Error Code = E49
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Low pressure fault

Error Code = E49
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Low voltage detected

Error Code = E51
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Inverter PCB fault

Error Code = E51
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Power transistor overheat

Error Code = E53
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Suction pipe thermistor (Tho-S) disconnected.

Error Code = E54
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Low pressure sensor (PSL) disconnected/output error

Error Code = E54
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Low pressure sensor (PSL) disconnection/output error

Error Code = E54
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes twice
Green LED = Keeps Flashing
Detail Of Fault = • High pressure sensor (PSH) disconnection/output error

Error Code = E55
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Compressor under dome thermistor disconnected

Error Code = E56
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Power transistor thermistor faulty or disconnected (FDCVA151-251)

Error Code = E57
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Refrigerant leak or shortage of refrigerant (FDCVA151-251)

Error Code = E59
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Compressor start-up error

Error Code = E60
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once or twice
Green LED = Keeps Flashing
Detail Of Fault = • Compressor position detection error

Error Code = E63
Indoor Circuit Board
Red LED = Stays Off
Green LED = Keeps Flashing
Outdoor Circuit Board
Red LED = Flashes once
Green LED = Keeps Flashing
Detail Of Fault = • Emergency stop of indoor unit

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