This list of Mitsubishi Air Conditioning fault codes will give you an idea of what is wrong with your Air Conditioning system.
|Mitsubishi Air Conditioning Error codes:
|P1 Intake sensor error
|P2 P9 Pipe sensor error
|E6 E7 Indoor/outdoor unit communication error
|P4 Drain sensor error
|P5 Drain pump error
|PA Forced compressor error
|p6 Freezing/Overheating safeguard operation
|EE Communication error between outdoor and indoor units
|P8 Pipe temperature error
E4 Remote controller signal receiving error
|Fb Indoor unit control system error
E0 E3 Remote controller transmission error
|E1 E2 Remote controller control board error
Troubleshooting an LED display on an outdoor controller board
|E9 Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
|U3, U4 Open/short of outdoor unit thermistors
|UF Compressor overcurrent interruption (When compressor locked)
|U2 Abnormal high discharging temperature/49C worked/insufficient refrigerant
|U1, Ud -Abnormal High Pressure /Overheat
|U5 Abnormal temperature of a heat sink
|U8 Outdoor unit fan safeguard stop
|U6 Compressor overcurrent interruption/Abnormality of a power module.
|E6 – Indoor/outdoor unit transmission error (signal receiving error).
|E7 – Indoor/outdoor unit transmission error (transmitting error).
|E8 – Indoor/outdoor unit transmission error (signal receiving error).
|E9 – Indoor/outdoor unit transmission error (transmitting error).
|E0 – Remote control transmission error (signal receiving error)
|E3 – Remote control transmission error (transmitting error)
|E4 – Remote control transmission error (signal receiving error)
|E5 – Remote control transmission error (transmitting error)
|EA- indicates a mis-wiring or overloading problem.
|EC- Start-up time over
EF- M-NET transmission error
|P1 Room temperature thermistor (TH1) is abnormal.
|P2 Error detail Abnormality of pipe temperature thermistor/liquid (TH2).
|P4 Error detail Abnomarlity of drain sensor (DS)
|P5 Error detail Malfunction of the drain-up machine.
|P6 Error detail Freezing/overheating protection detect.
|P8 Error detail Abnormality of pipe temperature.
|P9 Error detail Abnormality of pipe temperature thermistor/condenser/evaporator (TH5)
|F1 Reverse phase detection.
|F2 L3 open phase detection.
|F3 63L connector open
|F4 49C connector open
|F9 Connector 2 or more open.
|FA L2-phased open phase or 51CM connector open
|F7 Reverse phase detection circuit (p.c.board) fault.
|U0 Abnormal low voltage.
|U1 Abnormal high pressure (high-pressure switch 63H worked)
|U2 Abnormal high discharging temperature.
|U2 Inner thermostat (49C) operation.
|U3 Discharge thermistor short/open.
|U4 Outdoor thermistor short/open.
|U6 Compressor overcurrent (overload) cut off.
|UA Compressor over current (terminal relay operation).
|UF Compressor over current (start-up locked) cut off
|UE High-pressure error (ball valve closed)
|UL Abnormal low pressure