Mitsubishi Electric Air Conditioning Fault Codes Explained
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Written by Airway Air Conditioning Team
Just like their heavy industry counterparts, Mitsubishi Electric air conditioning units> use a combination of error codes and LEDs to notify the user of a potential fault. Below are some of the more common Mitsubishi Electric air conditioning fault codes that you may notice on your unit.
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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
For further help with Mitsubishi Electric air conditioning fault codes, contact the knowledgeable, friendly team at Airway Air Conditioning. We are proud to offer comprehensive repairs and maintenance for Mitsubishi air conditioning units, so give us a call if you need to take advantage of our expertise.