Mitsubishi Electric Error Codes

Mitsubishi electric air conditioning systems are very well known for their ultra-quite noise level as well as their higher savings on installation and running costs.

Looking to match your error codes. You have come to the right place!

If you are lost and want to get your air conditioning fixed quickly we are here to help. Don’t hesitate to call us on 0203 488 1889 or email us on

Mitsubishi Electric error codes:

City Multi

  • 403: Communications fault between boards – check the details of the inverter error to determine which boards are involved, and also check the transformer, bus voltage and any interconnecting cables
  • 900: The lossnay unit is in a test run
  • 1102: Compressor discharge temperature is too high, meaning it has exceeded 110C or more, and it may be short of refrigerant.
  • 1301: Low pressure fault – the pressure sensor has detected less than one bar of pressure before starting.

Mr Slim P Series (A)

  • A0: Green LED – 2 flashes, red LED – 5 flashes, controller 6600: Lossnay units are attached with the same address – simply change the addresses and reset the unit.
  • A2: Green LED – 2 flashes, red LED – 5 flashes, controller 6602: The transmission processor has encountered a hardware error – check communications wiring and for a fault on the lossnay board.
  • A6: Green LED – 2 flashes, red LED – 5 flashes, controller 6606: A communication error with the communication processor – check the M-Net voltage.
  • E0: Green LED – 2 flashes, red LED – 3 flashes:
  • Communication error with remote controller. Check the wiring, the voltage and connections. If multiple systems are connected, check the master/slave settings.

Mr Slim P Series (K)

  • EO: System transmission error – there could be a communications fault between the I/C and R/C
  • P4: Drain sensor fault – check the drain sensor resistance and connection
  • P5: Drain fault – high levels of condensate have been detected, so check for blockages in the drain, tray or pump failure
  • P7: System error – there is a fault with the address setting

Daikin Error Codes

Are you looking to repair your air-conditioning?

The Daikin error codes will help you fix your air-conditioning in no time. Similar to other devices, your Daikin air-conditioning will infrequently crash due to problem’s with some parts of the air conditioning system. In other cases it can be incorrect installation/settings.

Advantages of a Daikin unit are that they are pre-programmed and will display an error code that is relevant to the problem.  A great way to start fixing your air-conditioning is to match the error codes below.

All our engineers are fully qualified with high quality work. We offer great deals and services. We provide on day services for those in need. Don’t hesitate to give us a call today on 0203 488 1889.

List of Daikin Air Conditioner error codes:

Error Codes Problem
00 Normal
UA Indoor-outdoor Unit Combination Fault
U0 Refrigerant Shortage
U2 Drop Voltage or main circuit overvoltage
U4 Failure of transmission (Between indoor unit and outdoor unit)
A1 Indoor Pcb Defectivenes
A5 High Pressure Control Or Freeze-up Protector
A6 Fan Motor Fault
C4 Faulty Heat Exchanger Temperature Sensor
C9 Faulty Suction Air Temperature Sensor
EA Cooling-heating Switching Error
E1 Circuit Board Fault
E5 OL Started
E6 Faulty Compressor Start Up
E7 DC Fan Motor Fault
F3 High Temperature Discharge Pipe Control
F6 High Pressure Control (In Cooling)
H0 Sensor Fault
H6 Operation Halt Due To Faulty Position Detection Sensor
H8 DC Current Sensor Fault
H9 Faulty Suction Air Temperature Sensor
J3 Faulty Discharge Pipe Temperature Sensor
J6 Faulty Heat Exchanger Temperature Sensor
L3 Electrical Parts Heat Fault
L4 High Temperature At Inverter Circuit Heatsink
L5 Output Overcurrent
P4 Faulty Inverter Circuit Heatsink Temperature Sensor