Mitsubishi Air Conditioning error codes:
| Error code | Description |
| P1 | Intake sensor error |
| P2 | P9 Pipe (Liquid or 2-phase 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 indoor and outdoor units |
| P8 | Pipe temperature error |
| E4 | Remote controller signal receiving error |
| Fb | Indoor unit control system error (memory error, etc.) |
| E0 | E3 Remote controller transmission error |
| E1 | E2 Remote controller control board error |
Check the LED display of the outdoor controller board.
| Error code | Description |
| 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 (63H worked)/Overheating safeguard operation |
| U5 | Abnormal temperature of heat sink |
| U8 | Outdoor unit fan safeguard stop |
| U6 | Compressor overcurrent interruption/Abnormal of power module |
| U7 | Abnormality of super heat due to low discharge temperature |
| U9 UH | Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/ Current sensor error. |
Mr.Slim A-control error code list
| Error code | Description |
| EA | Error detail Mis-wiring of indoor/outdoor unit. exceed the number of indoor unit connection. |
| Eb | Error detail Mis-wiring of indoor/outdoor unit. (mis-wiring disconnection) |
| EC | Error detail Start-up time over |
| E6 | Error detail Indoor/outdoor unit transmission error (signal receiving error). |
| E7 | Error detail Indoor/outdoor unit transmission error (transmitting error). |
| E8 | Error detail Indoor/outdoor unit transmission error (signal receiving error). |
| E9 | Error detail Indoor/outdoor unit transmission error (transmitting error). |
| E0 | Error detail Remote control transmission error (signal receiving error) |
| E3 | Error detail Remote control transmission error (transmitting error) |
| E4 | Error detail Remote control transmission error (signal receiving error) |
| E5 | Error detail Remote control transmission error (transmitting error) |
| EF | Error detail M-NET transmission error |
| ED | Error detail Serial transmission error |
| P1 | Error detail Abnormality of room temperature thermistor (TH1). |
| P2 | Error detail Abnormality of pipe temperature themistor/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 | Error detail Reverse phase detection. |
| F2 | Error detail L3 open phase detection. |
| F3 | Error detail 63L connector open |
| F4 | Error detail 49C connector open |
| F9 | Error detail Connector 2 or more open. |
| FA | Error detail L2-phased open phase or 51CM connector open |
| F7 | Error detail Reverse phase detection circuit (p.c.board) fault. |
| F8 | Error detail Input circuit fault. |
| U2 | Error detail Abnormal high discharging temperature. |
| U2 | Error detail Inner thermostat (49C) operation. |
| U1 | Error detail Abnormal high pressure (high pressure swicth 63H worked) |
| UE | Error detail High-pressure error (ball valve closed) |
| UL | Error detail Abnormal low pressure |
| Ud | Error detail Overheat protection. |
| U6 | Error detail Compressor overcurrent (overload) cut off. |
| UA | Error detail Compressor over current (terminal relay operation). |
| UF | Error detail Compressor over current (start-up locked) cut off. |
| UF | Error detail Compressor over current (operating locked) cut off. |
| UH | Error detail Current sensor error. |
| U3 | Error detail Discharge thermistor short/open. |
| U4 | Error detail Outdoor thermistor short/open. |
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