Mitsubishi Electric
Mitsubishi Electric Humidifiers & Dehumidifiers Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E1
Dehumidifier stops and displays E1 shortly after power‑on; fan may run briefly then shut down.
Room Temperature Sensor (Thermistor) Fault
E2
Unit displays E2 and will not start dehumidifying; fan may or may not run.
Evaporator Coil Temperature Sensor Fault
E3
Dehumidifier shows E3 and stops cooling; fan may continue to run.
Humidity Sensor / RH Sensor Fault
E4
Unit displays E4 and stops; compressor does not run.
Defrost Sensor / Frost Protection Sensor Fault
E5
Dehumidifier shows E5 and will not start; sometimes occurs after a power surge.
Communication Error Between Display PCB and Main PCB
E6
Unit displays E6 and stops; fan may run but compressor does not start.
Compressor Overload / Overcurrent Protection Trip
E7
Display shows E7; fan does not run or runs briefly then stops.
Indoor Fan Motor / Fan Feedback Fault
E8
Unit shows E8 and stops; may occur after long continuous operation in a cold room.
Refrigerant System Protection / Abnormal Low Temperature
E9
Display shows E9; unit will not run.
EEPROM / Memory Error on Main PCB
F1
Humidifier/dehumidifier hybrid unit shows F1 and stops; humidity control unavailable.
Indoor Humidity Sensor Out of Range
F2
Unit displays F2; water collection stops even though fan may still run.
Water Level Sensor / Float Switch Fault
F3
Display shows F3; unit stops and may beep repeatedly.
Tank Present / Tank Position Detection Error
F4
Unit shows F4 and stops; often associated with continuous drain use.
Drain Pump / Drainage Error (Models with Built‑in Pump)
F5
Display shows F5; the unit may shut down unexpectedly during operation.
Overheating / High Temperature Protection
H1
Humidifier function error H1; the unit cannot raise humidity.
Humidifier Water Supply / Tank Empty Detection
H2
Humidifier error H2; the fan runs but there is no mist or moisture output.
Humidifier Element / Evaporative Filter Fault
H3
Humidifier error H3; the unit stops humidifying and may beep.
Humidifier Overflow / Leak Detection
U1
The unit displays U1 and stops, often after moving the appliance.
Tilt / Orientation Error
U2
The display shows U2; the unit will not start.
Low Voltage / Power Supply Abnormality
U3
The unit shows U3; the compressor and fan do not start.
Internal Communication / Mode Conflict Error
Symptom
A chemical or burning smell from the unit.
Electrical Overheating or Component Failure
Symptom
A musty or moldy smell from the dehumidifier during operation.
Biological Growth in Water System and Air Path
Symptom
Display flickers or dims while the unit is running.
Unstable Power Supply to Display
Symptom
Frost or ice builds up on the evaporator coil and does not melt during normal operation.
Defrost System Inefficiency
Symptom
Humidifier function produces very little or no moisture even with full tank.
Humidifier Output Low
Symptom
Loud grinding or scraping noise from the fan area; airflow is reduced.
Fan Wheel Damage or Bearing Failure
Symptom
Remote control does not operate the unit (for models with IR remote).
Remote Control / IR Receiver Issue
Symptom
The dehumidifier runs but does not collect water; the room remains humid.
Loss of Refrigerant Charge / Weak Cooling Circuit
Symptom
The dehumidifier stops frequently when the tank is not full; the 'tank full' light is on.
False Tank Full Detection
Symptom
The display works, but the compressor never starts; only the fan runs continuously.
Compressor Start Failure
Symptom
The humidity reading on the display is clearly inaccurate compared to a separate hygrometer.
Humidity Sensor Drift / Miscalibration
Symptom
The unit is very noisy during operation; rattling or buzzing sounds come from inside.
Mechanical Vibration / Loose Components
Symptom
The unit powers on, but buttons do not respond or respond intermittently.
Keypad / Control Panel Failure
Symptom
The unit runs for a few minutes, then shuts off; it can be restarted after a short time.
Thermal Overload / Overheating Protection Cycling
Symptom
The unit vibrates excessively and moves on the floor during operation.
Excessive Vibration / Imbalance
Symptom
The unit will not power on at all; no lights or display.
No Power / Power Supply Failure
Symptom
Unit frequently switches between dehumidify and standby even though room is still damp.
Short Cycling Due to Sensor Placement or Settings
Symptom
Water is leaking from the bottom of the dehumidifier onto the floor.
Drainage System Leak or Blockage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Dehumidifier stops and displays E1 shortly after power‑on; fan may run briefly then shut down.
|
Room Temperature Sensor (Thermistor) Fault | View Details |
| E2 |
Unit displays E2 and will not start dehumidifying; fan may or may not run.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Dehumidifier shows E3 and stops cooling; fan may continue to run.
|
Humidity Sensor / RH Sensor Fault | View Details |
| E4 |
Unit displays E4 and stops; compressor does not run.
|
Defrost Sensor / Frost Protection Sensor Fault | View Details |
| E5 |
Dehumidifier shows E5 and will not start; sometimes occurs after a power surge.
|
Communication Error Between Display PCB and Main PCB | View Details |
| E6 |
Unit displays E6 and stops; fan may run but compressor does not start.
|
Compressor Overload / Overcurrent Protection Trip | View Details |
| E7 |
Display shows E7; fan does not run or runs briefly then stops.
|
Indoor Fan Motor / Fan Feedback Fault | View Details |
| E8 |
Unit shows E8 and stops; may occur after long continuous operation in a cold room.
|
Refrigerant System Protection / Abnormal Low Temperature | View Details |
| E9 |
Display shows E9; unit will not run.
|
EEPROM / Memory Error on Main PCB | View Details |
| F1 |
Humidifier/dehumidifier hybrid unit shows F1 and stops; humidity control unavailable.
|
Indoor Humidity Sensor Out of Range | View Details |
| F2 |
Unit displays F2; water collection stops even though fan may still run.
|
Water Level Sensor / Float Switch Fault | View Details |
| F3 |
Display shows F3; unit stops and may beep repeatedly.
|
Tank Present / Tank Position Detection Error | View Details |
| F4 |
Unit shows F4 and stops; often associated with continuous drain use.
|
Drain Pump / Drainage Error (Models with Built‑in Pump) | View Details |
| F5 |
Display shows F5; the unit may shut down unexpectedly during operation.
|
Overheating / High Temperature Protection | View Details |
| H1 |
Humidifier function error H1; the unit cannot raise humidity.
|
Humidifier Water Supply / Tank Empty Detection | View Details |
| H2 |
Humidifier error H2; the fan runs but there is no mist or moisture output.
|
Humidifier Element / Evaporative Filter Fault | View Details |
| H3 |
Humidifier error H3; the unit stops humidifying and may beep.
|
Humidifier Overflow / Leak Detection | View Details |
| U1 |
The unit displays U1 and stops, often after moving the appliance.
|
Tilt / Orientation Error | View Details |
| U2 |
The display shows U2; the unit will not start.
|
Low Voltage / Power Supply Abnormality | View Details |
| U3 |
The unit shows U3; the compressor and fan do not start.
|
Internal Communication / Mode Conflict Error | View Details |
| – |
A chemical or burning smell from the unit.
|
Electrical Overheating or Component Failure | View Details |
| – |
A musty or moldy smell from the dehumidifier during operation.
|
Biological Growth in Water System and Air Path | View Details |
| – |
Display flickers or dims while the unit is running.
|
Unstable Power Supply to Display | View Details |
| – |
Frost or ice builds up on the evaporator coil and does not melt during normal operation.
|
Defrost System Inefficiency | View Details |
| – |
Humidifier function produces very little or no moisture even with full tank.
|
Humidifier Output Low | View Details |
| – |
Loud grinding or scraping noise from the fan area; airflow is reduced.
|
Fan Wheel Damage or Bearing Failure | View Details |
| – |
Remote control does not operate the unit (for models with IR remote).
|
Remote Control / IR Receiver Issue | View Details |
| – |
The dehumidifier runs but does not collect water; the room remains humid.
|
Loss of Refrigerant Charge / Weak Cooling Circuit | View Details |
| – |
The dehumidifier stops frequently when the tank is not full; the 'tank full' light is on.
|
False Tank Full Detection | View Details |
| – |
The display works, but the compressor never starts; only the fan runs continuously.
|
Compressor Start Failure | View Details |
| – |
The humidity reading on the display is clearly inaccurate compared to a separate hygrometer.
|
Humidity Sensor Drift / Miscalibration | View Details |
| – |
The unit is very noisy during operation; rattling or buzzing sounds come from inside.
|
Mechanical Vibration / Loose Components | View Details |
| – |
The unit powers on, but buttons do not respond or respond intermittently.
|
Keypad / Control Panel Failure | View Details |
| – |
The unit runs for a few minutes, then shuts off; it can be restarted after a short time.
|
Thermal Overload / Overheating Protection Cycling | View Details |
| – |
The unit vibrates excessively and moves on the floor during operation.
|
Excessive Vibration / Imbalance | View Details |
| – |
The unit will not power on at all; no lights or display.
|
No Power / Power Supply Failure | View Details |
| – |
Unit frequently switches between dehumidify and standby even though room is still damp.
|
Short Cycling Due to Sensor Placement or Settings | View Details |
| – |
Water is leaking from the bottom of the dehumidifier onto the floor.
|
Drainage System Leak or Blockage | View Details |
No matching codes found
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