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 |
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