Bionaire Humidifiers & Dehumidifiers Error Codes

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 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; fan may still run but no dehumidification

Defrost System / Coil Temperature Error

E8

Dehumidifier shows E8 and shuts down; 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 shows F2 and shuts off mist output

Water Level Sensor / Float Switch Error

F3

Humidifier displays F3 and fan may still run without mist

Ultrasonic Transducer / Nebulizer Fault

F4

Humidifier shows 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 unit does not dehumidify

Low Ambient Temperature Lockout

Symptom

Dehumidifier bucket full light stays on even when 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; 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 compressor never starts; fan runs normally

Compressor Start Failure

Symptom

Dehumidifier runs but does not collect water; 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 very little mist is produced; output is weak

Reduced Mist Output

Symptom

Humidifier shuts off even though there is still water in the tank

False Empty Tank Detection