| Code | Possible Cause |
|---|---|
| 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 |
| E9 | Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit) |
| UP | Compressor overcurrent interruption |
| 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 superheat due to low discharge temperature |
| U9 | UH Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit/ Current sensor error. |
Mitsubishi Mr. Slim A-control Error Codes
| Code | Possible Cause |
|---|---|
| EA | Error detail Miswiring of indoor/outdoor unit. exceed the number of indoor unit connection. |
| EB | Error detail Miswiring 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 thermistor/liquid (TH2) |
| P4 | Error detail Abnormality of drain sensor (DS) |
| P5 | Error detail Malfunction of drain-up machine |
| P6 | Error detail Freezing/overheating protection detect |
| P8 | Error detail Abnormality of pipe temperature |
| P9 | Error detail Anormality 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) |
| U1 | Error detail Direct cut operation |
| UE | Error detail High pressure error (ball valve closed) |
| UL | Error detail Abnormal low pressure |
| UD | Error detail Overheat protection |
| U6 | Error detail Compressor over current (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 |
| Mr.Slim K-control | Display of remote controller |
| LED E0 | Diagnosis of malfunction Transmitting/receiving signal error |
| LED P1 | Diagnosis of malfunction Intake air sensor abnormal |
| LED P2 | Diagnosis of malfunction Pipe sensor abnormal |
| LED P4 | Diagnosis of malfunction Drain sensor abnormal |
| LED P5 | Diagnosis of malfunction Malfunctioning of the drain overflow protecting mechanism |
| LED P6 | Diagnosis of malfunction Abnormality of the coil frost/overheating protection mode |
| LED P3 | Diagnosis of malfunction System error (transmitting/receiving signal) |
| LED P7 | Diagnosis of malfunction System error (address) |
| LED P8 | Diagnosis of malfunction Outdoor unit malfunction |
| Mr.Slim K-control | PUH-EK Outdoor unit |
| LED ON | Operation status |
| LED Flash | Check code display |
| LED LD1 | LED ON Compressor directive LED Flash Reverse phase detect |
| LED LD2 | LED ON Heating directive LED Flash Open phase detect |
| LED LD3 | LED ON During 63H1 operation LED Flash Pipe sensor short/open |
| LED LD4 | LED ON Compressor ON LED Flash High pressure switch (63H2) operation |
| LED LD5 | LED ON Outdoor fan ON LED Flash Over current relay (51CM) operation |
| LED LD6 | LED ON 4-way valve ON LED Flash Thermal switch (26C) operation |
| LED LD7 | LED ON Bypass valve ON LED Flash Thermistor (TH3) overheat protection |
| LED LD8 | LED ON Crankcase heater ON LED Flash Defective input |
Mitsubishi Mr. Slim Error Codes (Membrane Type Remote Controllers)
| Code | Possible Cause |
|---|---|
| EO | During individual unit control: Bad contact of transmission wire Signal transmitting/receiving circuits are abnormal |
| P1 | Bad contact of thermistor Damaged thermistor |
| P2 | Bad contact of thermistor Damaged thermistor |
| P3 | Bad contact of transmission wire Signal transmitting/receiving circuits are abnormal Wrong operation due to noise wave emitted by other appliances |
| P4 | Bad contact of transmission wire Damaged thermistor |
| P5 | Malfunction of drain pump Damaged drain sensor |
| P6 | Short cycle of air cycle Dirty air filter Damaged fan Abnormal refrigerant |
| P7 | Wrong address-setting Signal transmitting/receiving circuit of remote controller is abnormal Wrong SW6-setting |
| P8 | Wrong wiring of indoor/outdoor connecting wire Reversed phase Protection device is working Damaged outdoor coil thermistor |
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