Mitsubishi Electric
Mitsubishi Electric Air Conditioners Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E0
Indoor unit will not start, display shows E0 shortly after power-on
Indoor Unit EEPROM Initialization Error
E1
Indoor unit stops and displays E1, outdoor unit does not start
Indoor–Outdoor Communication Failure
E2
Indoor unit stops, E2 displayed, fan may run briefly then stop
Indoor Room Temperature Sensor (Thermistor) Fault
E3
Indoor unit stops cooling/heating, E3 displayed, may stop shortly after startup
Indoor Coil (Heat Exchanger) Temperature Sensor Fault
E4
Indoor unit displays E4, and the unit may not respond to remote commands.
Indoor Unit EEPROM or Configuration Error
E5
Indoor unit displays E5, and operation stops shortly after starting.
Indoor Fan Motor Lock or Feedback Error
E6
Indoor unit displays E6, the outdoor unit does not start, and there is no cooling or heating.
Outdoor Unit Communication or Power Supply Error
E7
Indoor unit displays E7, and the louver may not move correctly.
Indoor Horizontal/Vertical Louver Motor Fault
E8
Indoor unit displays E8, the unit may stop during operation, sometimes related to overcurrent.
Indoor Fan Overcurrent or PCB Overload Protection
E9
Indoor unit displays E9, the unit may stop, and the drain pan may be full of water.
Drain Pump or Float Switch Error
F1
Indoor unit displays F1; the unit may not respond to the remote control.
Indoor Unit Communication Address or Remote Receiver Error
F2
Indoor unit displays F2, and operation stops.
Indoor Humidity Sensor or Additional Thermistor Fault (model-dependent)
F3
Indoor unit displays F3, often related to intake or discharge air temperature.
Indoor Intake or Discharge Air Thermistor Fault
F4
Indoor unit displays F4; the unit may stop during operation.
Indoor Heat Exchanger Freeze / Overheat Protection
F5
Indoor unit displays F5, often associated with the outdoor ambient temperature sensor.
Outdoor Ambient Temperature Sensor Fault
F6
Indoor unit displays F6; the system may not start or may stop unexpectedly.
Indoor–Remote Controller Communication Error (wired controller models)
F7
Indoor unit displays F7, often in multi-split systems
Indoor Unit Address Conflict or Capacity Mismatch
F8
Indoor unit displays F8, system may not operate in certain modes
Mode Conflict or Central Control Lockout
F9
Indoor unit displays F9, often related to filter or air quality functions
Filter Sign / Air Quality Sensor Error
P1
Outdoor unit stops, P1 error is logged or displayed, and the compressor does not run.
Inverter DC Bus Overvoltage / Undervoltage
P2
Outdoor unit stops with a P2 error, and the compressor may start then quickly stop.
Inverter Module Overcurrent / Short Circuit Protection
P3
Outdoor unit stops with P3, often during high load or high ambient temperature.
Outdoor Heat Sink / Inverter Overheating
P4
The system stops with P4, often associated with compressor temperature issues.
Compressor Discharge Temperature High
P5
System stops with P5, often during heating mode.
Outdoor Coil Temperature Sensor / Defrost Control Error
P6
System stops with P6; the compressor may not start or may stop quickly.
Compressor Position / Inverter Drive Error
P7
System stops with P7, often related to low ambient temperature or abnormal pressure.
Low Pressure / Suction Temperature Protection
P8
System stops with P8; this may occur during defrost or mode change.
Four-Way Reversing Valve or Discharge Pressure Protection
Symptom
Burning or electrical smell from the indoor or outdoor unit.
Overheating Electrical Component
Symptom
Indoor unit displays lights but does not respond to remote control commands.
Remote Control Reception Failure
Symptom
Indoor unit does not start at all; no lights or response to remote
No Power to Indoor Unit
Symptom
Indoor unit emits clicking or ticking noises when starting or stopping.
Thermal Expansion and Plastic Casing Noise
Symptom
Indoor unit fan does not run, but lights and display are on; the compressor may or may not run.
Indoor Fan Motor Failure
Symptom
Indoor unit frequently turns on and off (short cycling) without reaching the set temperature.
Short Cycling / Control Instability
Symptom
Indoor unit makes loud rattling, buzzing, or grinding noises during operation
Indoor Mechanical Noise / Fan Imbalance
Symptom
Indoor unit powers on but compressor and outdoor fan do not start; only indoor fan runs
Outdoor Unit Not Operating
Symptom
Indoor unit runs but does not cool effectively; air is only slightly cool or room never reaches set temperature
Insufficient Cooling Capacity / Performance Degradation
Symptom
Outdoor fan does not run while the compressor is operating, causing very hot air and possible shutdown.
Outdoor Fan Motor Failure
Symptom
Outdoor unit makes loud humming, rattling, or metallic noises
Outdoor Mechanical Noise / Vibration
Symptom
Strong musty or moldy smell from the indoor unit when it starts.
Biological Growth on Indoor Coil and Drain Pan
Symptom
Unit runs in heating mode but delivers only lukewarm air, and the room does not heat adequately.
Poor Heating Performance
Symptom
Unit trips the circuit breaker when starting or during operation.
Electrical Overload or Short Circuit
Symptom
Water dripping from outdoor unit or excessive water around base
Outdoor Unit Condensate / Defrost Water Drainage Issue
Symptom
Water dripping from the indoor unit front panel or onto the wall/floor
Indoor Unit Water Leakage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E0 |
Indoor unit will not start, display shows E0 shortly after power-on
|
Indoor Unit EEPROM Initialization Error | View Details |
| E1 |
Indoor unit stops and displays E1, outdoor unit does not start
|
Indoor–Outdoor Communication Failure | View Details |
| E2 |
Indoor unit stops, E2 displayed, fan may run briefly then stop
|
Indoor Room Temperature Sensor (Thermistor) Fault | View Details |
| E3 |
Indoor unit stops cooling/heating, E3 displayed, may stop shortly after startup
|
Indoor Coil (Heat Exchanger) Temperature Sensor Fault | View Details |
| E4 |
Indoor unit displays E4, and the unit may not respond to remote commands.
|
Indoor Unit EEPROM or Configuration Error | View Details |
| E5 |
Indoor unit displays E5, and operation stops shortly after starting.
|
Indoor Fan Motor Lock or Feedback Error | View Details |
| E6 |
Indoor unit displays E6, the outdoor unit does not start, and there is no cooling or heating.
|
Outdoor Unit Communication or Power Supply Error | View Details |
| E7 |
Indoor unit displays E7, and the louver may not move correctly.
|
Indoor Horizontal/Vertical Louver Motor Fault | View Details |
| E8 |
Indoor unit displays E8, the unit may stop during operation, sometimes related to overcurrent.
|
Indoor Fan Overcurrent or PCB Overload Protection | View Details |
| E9 |
Indoor unit displays E9, the unit may stop, and the drain pan may be full of water.
|
Drain Pump or Float Switch Error | View Details |
| F1 |
Indoor unit displays F1; the unit may not respond to the remote control.
|
Indoor Unit Communication Address or Remote Receiver Error | View Details |
| F2 |
Indoor unit displays F2, and operation stops.
|
Indoor Humidity Sensor or Additional Thermistor Fault (model-dependent) | View Details |
| F3 |
Indoor unit displays F3, often related to intake or discharge air temperature.
|
Indoor Intake or Discharge Air Thermistor Fault | View Details |
| F4 |
Indoor unit displays F4; the unit may stop during operation.
|
Indoor Heat Exchanger Freeze / Overheat Protection | View Details |
| F5 |
Indoor unit displays F5, often associated with the outdoor ambient temperature sensor.
|
Outdoor Ambient Temperature Sensor Fault | View Details |
| F6 |
Indoor unit displays F6; the system may not start or may stop unexpectedly.
|
Indoor–Remote Controller Communication Error (wired controller models) | View Details |
| F7 |
Indoor unit displays F7, often in multi-split systems
|
Indoor Unit Address Conflict or Capacity Mismatch | View Details |
| F8 |
Indoor unit displays F8, system may not operate in certain modes
|
Mode Conflict or Central Control Lockout | View Details |
| F9 |
Indoor unit displays F9, often related to filter or air quality functions
|
Filter Sign / Air Quality Sensor Error | View Details |
| P1 |
Outdoor unit stops, P1 error is logged or displayed, and the compressor does not run.
|
Inverter DC Bus Overvoltage / Undervoltage | View Details |
| P2 |
Outdoor unit stops with a P2 error, and the compressor may start then quickly stop.
|
Inverter Module Overcurrent / Short Circuit Protection | View Details |
| P3 |
Outdoor unit stops with P3, often during high load or high ambient temperature.
|
Outdoor Heat Sink / Inverter Overheating | View Details |
| P4 |
The system stops with P4, often associated with compressor temperature issues.
|
Compressor Discharge Temperature High | View Details |
| P5 |
System stops with P5, often during heating mode.
|
Outdoor Coil Temperature Sensor / Defrost Control Error | View Details |
| P6 |
System stops with P6; the compressor may not start or may stop quickly.
|
Compressor Position / Inverter Drive Error | View Details |
| P7 |
System stops with P7, often related to low ambient temperature or abnormal pressure.
|
Low Pressure / Suction Temperature Protection | View Details |
| P8 |
System stops with P8; this may occur during defrost or mode change.
|
Four-Way Reversing Valve or Discharge Pressure Protection | View Details |
| – |
Burning or electrical smell from the indoor or outdoor unit.
|
Overheating Electrical Component | View Details |
| – |
Indoor unit displays lights but does not respond to remote control commands.
|
Remote Control Reception Failure | View Details |
| – |
Indoor unit does not start at all; no lights or response to remote
|
No Power to Indoor Unit | View Details |
| – |
Indoor unit emits clicking or ticking noises when starting or stopping.
|
Thermal Expansion and Plastic Casing Noise | View Details |
| – |
Indoor unit fan does not run, but lights and display are on; the compressor may or may not run.
|
Indoor Fan Motor Failure | View Details |
| – |
Indoor unit frequently turns on and off (short cycling) without reaching the set temperature.
|
Short Cycling / Control Instability | View Details |
| – |
Indoor unit makes loud rattling, buzzing, or grinding noises during operation
|
Indoor Mechanical Noise / Fan Imbalance | View Details |
| – |
Indoor unit powers on but compressor and outdoor fan do not start; only indoor fan runs
|
Outdoor Unit Not Operating | View Details |
| – |
Indoor unit runs but does not cool effectively; air is only slightly cool or room never reaches set temperature
|
Insufficient Cooling Capacity / Performance Degradation | View Details |
| – |
Outdoor fan does not run while the compressor is operating, causing very hot air and possible shutdown.
|
Outdoor Fan Motor Failure | View Details |
| – |
Outdoor unit makes loud humming, rattling, or metallic noises
|
Outdoor Mechanical Noise / Vibration | View Details |
| – |
Strong musty or moldy smell from the indoor unit when it starts.
|
Biological Growth on Indoor Coil and Drain Pan | View Details |
| – |
Unit runs in heating mode but delivers only lukewarm air, and the room does not heat adequately.
|
Poor Heating Performance | View Details |
| – |
Unit trips the circuit breaker when starting or during operation.
|
Electrical Overload or Short Circuit | View Details |
| – |
Water dripping from outdoor unit or excessive water around base
|
Outdoor Unit Condensate / Defrost Water Drainage Issue | View Details |
| – |
Water dripping from the indoor unit front panel or onto the wall/floor
|
Indoor Unit Water Leakage | View Details |
No matching codes found
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