Bionaire
Bionaire 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 will not start and displays E1 on the control panel.
Control Panel Keypad Communication Error
E2
Dehumidifier runs briefly, then stops and shows E2 on the display.
Room Temperature Sensor (NTC Thermistor) Fault
E3
Dehumidifier displays E3 and will not start dehumidifying.
Evaporator Coil Temperature Sensor Fault
E4
Dehumidifier shows E4 and the compressor does not run.
Humidity Sensor (RH Sensor) Fault
E5
Dehumidifier displays E5 and shuts down shortly after starting.
Refrigeration System Protection / High or Low Temperature Fault
E6
Dehumidifier shows E6 and will not run the compressor.
Compressor Relay or Overcurrent Fault
E7
Dehumidifier beeps and shows E7; the fan may still run, but no dehumidification occurs.
Defrost System / Coil Temperature Error
E8
Dehumidifier shows E8 and shuts down; it may restart after unplugging.
Internal Overheat / High Temperature Protection
E9
Dehumidifier displays E9 and will not respond to controls.
EEPROM / Memory Error in Control Board
F0
Humidifier or dehumidifier shows F0 and stops operating.
General Sensor Fault / Sensor Out of Range
F1
Humidifier displays F1 and does not produce mist.
Humidity Sensor / Control Fault (Humidifier Models)
F2
Humidifier displays F2 and stops mist output.
Water Level Sensor / Float Switch Error
F3
Humidifier displays F3, and the fan may still run without mist.
Ultrasonic Transducer / Nebulizer Fault
F4
Humidifier displays F4 and shuts down shortly after starting.
Overheat / Dry-Run Protection (Humidifier)
HI
Dehumidifier display shows HI and may run continuously.
High Humidity or Humidity Sensor Out of Range
LO
Dehumidifier display shows LO, and the unit does not dehumidify.
Low Ambient Temperature Lockout
Symptom
Dehumidifier 'bucket full' light stays on even when the bucket is empty and properly installed.
Bucket Full Switch Malfunction
Symptom
Dehumidifier coils freeze into a solid block of ice during operation
Evaporator Coil Icing
Symptom
Dehumidifier display and buttons work but settings cannot be changed
Keypad / Button Failure
Symptom
Dehumidifier display is blank but unit still runs when plugged in
Display Backlight / LCD Failure
Symptom
Dehumidifier does not power on at all (no lights, no display).
No Power / Main Power Circuit Failure
Symptom
Dehumidifier emits a musty or moldy odor from the air outlet.
Microbial Growth in Water Path and Coils
Symptom
Dehumidifier fan does not run; the compressor may start and then shut off.
Fan Motor Failure
Symptom
Dehumidifier frequently turns on and off in short cycles.
Short Cycling / Control or Sensor Issue
Symptom
Dehumidifier leaks water onto the floor instead of into the bucket or drain hose.
Water Leakage / Drainage Fault
Symptom
Dehumidifier makes loud rattling or grinding noises during operation.
Mechanical Noise / Vibration Fault
Symptom
Dehumidifier powers on, but the compressor never starts; the fan runs normally.
Compressor Start Failure
Symptom
Dehumidifier runs but does not collect water; the room remains humid.
Poor Dehumidification / Refrigeration System Underperformance
Symptom
Dehumidifier runs continuously and never reaches the set humidity
Ineffective Humidity Control
Symptom
Humidifier has a strong plastic or burning smell when running
Overheating or Electrical Insulation Odor
Symptom
Humidifier is very noisy or vibrates excessively during operation.
Mechanical Vibration / Noise (Humidifier)
Symptom
Humidifier leaks water from the base or around the tank.
Humidifier Water Leakage
Symptom
Humidifier powers on but produces no mist.
No Mist Output (Humidifier)
Symptom
Humidifier produces a white dust on nearby surfaces.
Mineral Dust Emission
Symptom
Humidifier runs but produces very little mist; output is weak.
Reduced Mist Output
Symptom
Humidifier shuts off even though there is still water in the tank.
False Empty Tank Detection
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Dehumidifier will not start and displays E1 on the control panel.
|
Control Panel Keypad Communication Error | View Details |
| E2 |
Dehumidifier runs briefly, then stops and shows E2 on the display.
|
Room Temperature Sensor (NTC Thermistor) Fault | View Details |
| E3 |
Dehumidifier displays E3 and will not start dehumidifying.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E4 |
Dehumidifier shows E4 and the compressor does not run.
|
Humidity Sensor (RH Sensor) Fault | View Details |
| E5 |
Dehumidifier displays E5 and shuts down shortly after starting.
|
Refrigeration System Protection / High or Low Temperature Fault | View Details |
| E6 |
Dehumidifier shows E6 and will not run the compressor.
|
Compressor Relay or Overcurrent Fault | View Details |
| E7 |
Dehumidifier beeps and shows E7; the fan may still run, but no dehumidification occurs.
|
Defrost System / Coil Temperature Error | View Details |
| E8 |
Dehumidifier shows E8 and shuts down; it may restart after unplugging.
|
Internal Overheat / High Temperature Protection | View Details |
| E9 |
Dehumidifier displays E9 and will not respond to controls.
|
EEPROM / Memory Error in Control Board | View Details |
| F0 |
Humidifier or dehumidifier shows F0 and stops operating.
|
General Sensor Fault / Sensor Out of Range | View Details |
| F1 |
Humidifier displays F1 and does not produce mist.
|
Humidity Sensor / Control Fault (Humidifier Models) | View Details |
| F2 |
Humidifier displays F2 and stops mist output.
|
Water Level Sensor / Float Switch Error | View Details |
| F3 |
Humidifier displays F3, and the fan may still run without mist.
|
Ultrasonic Transducer / Nebulizer Fault | View Details |
| F4 |
Humidifier displays F4 and shuts down shortly after starting.
|
Overheat / Dry-Run Protection (Humidifier) | View Details |
| HI |
Dehumidifier display shows HI and may run continuously.
|
High Humidity or Humidity Sensor Out of Range | View Details |
| LO |
Dehumidifier display shows LO, and the unit does not dehumidify.
|
Low Ambient Temperature Lockout | View Details |
| – |
Dehumidifier 'bucket full' light stays on even when the bucket is empty and properly installed.
|
Bucket Full Switch Malfunction | View Details |
| – |
Dehumidifier coils freeze into a solid block of ice during operation
|
Evaporator Coil Icing | View Details |
| – |
Dehumidifier display and buttons work but settings cannot be changed
|
Keypad / Button Failure | View Details |
| – |
Dehumidifier display is blank but unit still runs when plugged in
|
Display Backlight / LCD Failure | View Details |
| – |
Dehumidifier does not power on at all (no lights, no display).
|
No Power / Main Power Circuit Failure | View Details |
| – |
Dehumidifier emits a musty or moldy odor from the air outlet.
|
Microbial Growth in Water Path and Coils | View Details |
| – |
Dehumidifier fan does not run; the compressor may start and then shut off.
|
Fan Motor Failure | View Details |
| – |
Dehumidifier frequently turns on and off in short cycles.
|
Short Cycling / Control or Sensor Issue | View Details |
| – |
Dehumidifier leaks water onto the floor instead of into the bucket or drain hose.
|
Water Leakage / Drainage Fault | View Details |
| – |
Dehumidifier makes loud rattling or grinding noises during operation.
|
Mechanical Noise / Vibration Fault | View Details |
| – |
Dehumidifier powers on, but the compressor never starts; the fan runs normally.
|
Compressor Start Failure | View Details |
| – |
Dehumidifier runs but does not collect water; the room remains humid.
|
Poor Dehumidification / Refrigeration System Underperformance | View Details |
| – |
Dehumidifier runs continuously and never reaches the set humidity
|
Ineffective Humidity Control | View Details |
| – |
Humidifier has a strong plastic or burning smell when running
|
Overheating or Electrical Insulation Odor | View Details |
| – |
Humidifier is very noisy or vibrates excessively during operation.
|
Mechanical Vibration / Noise (Humidifier) | View Details |
| – |
Humidifier leaks water from the base or around the tank.
|
Humidifier Water Leakage | View Details |
| – |
Humidifier powers on but produces no mist.
|
No Mist Output (Humidifier) | View Details |
| – |
Humidifier produces a white dust on nearby surfaces.
|
Mineral Dust Emission | View Details |
| – |
Humidifier runs but produces very little mist; output is weak.
|
Reduced Mist Output | View Details |
| – |
Humidifier shuts off even though there is still water in the tank.
|
False Empty Tank Detection | View Details |
No matching codes found
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