Essick Air
Essick Air 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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CF
Digital console humidifier displays CF and stops running; fan will not turn on until filter is replaced or reset.
Check Filter Service Reminder
CF2
Some Essick Air models display CF2 or a second filter reminder and reduce output.
Secondary Filter Service Reminder
CL
Display shows CL or flashes CL and unit may beep, indicating cleaning is required.
Clean Indicator / Maintenance Reminder
E1
Essick Air digital humidifier displays E1 and will not operate or responds erratically to controls.
Room Temperature Sensor Fault
E2
Essick Air digital humidifier shows E2 and does not maintain humidity setpoint; may not run at all.
Humidity Sensor (Humidistat) Fault
E3
Essick Air digital humidifier displays E3 and shuts down or will not start the fan.
Fan Motor or Fan Feedback Error
E4
Essick Air digital humidifier shows E4 and may shut down or fail to respond to keypad inputs.
Control Panel / Keypad Communication Error
F
Digital Essick Air humidifier displays an F or flashing F and will not run; unit may beep repeatedly.
Empty or Improperly Seated Water Bottle
HI
Display shows HI humidity and the humidifier will not turn on or shuts off quickly even though the room feels dry.
High Humidity Reading / Sensor Shorted
LO
Display shows LO humidity reading and the humidifier runs continuously but room still feels dry.
Low Humidity Reading / Sensor Out of Range
Symptom
Dehumidifier (Essick Air / AIRCARE-branded) does not collect water even though it runs and fan operates.
Refrigeration System Failure (Dehumidifier)
Symptom
Dehumidifier bucket fills too quickly or unit runs constantly in a damp basement.
High Moisture Load / Normal Operation Question
Symptom
Dehumidifier coils freeze over with ice and airflow is reduced.
Evaporator Coil Icing (Dehumidifier)
Symptom
Dehumidifier fan runs but no air is felt at the outlet.
Blower Wheel Disconnected or Broken
Symptom
Dehumidifier shuts off and will not restart until the bucket is removed and reinstalled.
Bucket Switch or Float Misalignment
Symptom
Digital display works but buttons do not respond or only some buttons work.
Keypad / Membrane Switch Failure
Symptom
Humidifier base overfills and water spills out when tank is installed.
Float or Level Control Failure
Symptom
Humidifier base shows heavy white or brown scale buildup; performance is reduced.
Mineral Scale Accumulation
Symptom
Humidifier display is very dim or unreadable, but unit still runs.
LED / LCD Display Degradation
Symptom
Humidifier emits a chemical or plastic burning smell when running.
Overheating Electrical Component
Symptom
Humidifier fan runs but water level in base does not drop; wick remains mostly dry.
Wick Not Wicking Water
Symptom
Humidifier leaks water onto the floor from the base or around the bottle.
Water Bottle or Reservoir Leak
Symptom
Humidifier lights up but fan does not run; no airflow from vents.
Fan Motor Failure
Symptom
Humidifier makes loud grinding, rattling, or squealing noises during operation.
Mechanical Noise from Fan or Motor Mounts
Symptom
Humidifier produces a musty or moldy odor during operation.
Microbial Growth in Reservoir and Wick
Symptom
Humidifier runs but there is little or no visible humidity output; room humidity does not increase.
Restricted Wick Evaporation
Symptom
Humidifier runs continuously and room becomes overly damp or condensation forms on windows.
Humidistat Stuck On / Fails to Shut Off
Symptom
Humidifier shuts off even though the room humidity is below the setpoint.
Premature Humidistat Satisfied
Symptom
Humidifier tank is difficult to remove or install; may stick or not latch properly.
Deformed Tank or Worn Tank Guides
Symptom
Humidifier trips the household circuit breaker or blows a fuse when turned on.
Electrical Short or Overload
Symptom
Humidifier turns on and off rapidly or cycles every few seconds without reaching set humidity.
Erratic Humidistat Operation
Symptom
Humidifier vibrates excessively and may move slightly on the floor or table.
Imbalanced Fan or Loose Mounts
Symptom
Humidifier will not start unless the tank is jiggled or pressed down.
Intermittent Water Level or Tank Presence Detection
Symptom
Humidifier will not turn on at all; no lights or display when plugged in.
No Power / Dead Control Board
Symptom
Water bottle does not empty into the base; unit runs dry quickly and shuts off.
Bottle Valve or Airlock Problem
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CF |
Digital console humidifier displays CF and stops running; fan will not turn on until filter is replaced or reset.
|
Check Filter Service Reminder | View Details |
| CF2 |
Some Essick Air models display CF2 or a second filter reminder and reduce output.
|
Secondary Filter Service Reminder | View Details |
| CL |
Display shows CL or flashes CL and unit may beep, indicating cleaning is required.
|
Clean Indicator / Maintenance Reminder | View Details |
| E1 |
Essick Air digital humidifier displays E1 and will not operate or responds erratically to controls.
|
Room Temperature Sensor Fault | View Details |
| E2 |
Essick Air digital humidifier shows E2 and does not maintain humidity setpoint; may not run at all.
|
Humidity Sensor (Humidistat) Fault | View Details |
| E3 |
Essick Air digital humidifier displays E3 and shuts down or will not start the fan.
|
Fan Motor or Fan Feedback Error | View Details |
| E4 |
Essick Air digital humidifier shows E4 and may shut down or fail to respond to keypad inputs.
|
Control Panel / Keypad Communication Error | View Details |
| F |
Digital Essick Air humidifier displays an F or flashing F and will not run; unit may beep repeatedly.
|
Empty or Improperly Seated Water Bottle | View Details |
| HI |
Display shows HI humidity and the humidifier will not turn on or shuts off quickly even though the room feels dry.
|
High Humidity Reading / Sensor Shorted | View Details |
| LO |
Display shows LO humidity reading and the humidifier runs continuously but room still feels dry.
|
Low Humidity Reading / Sensor Out of Range | View Details |
| – |
Dehumidifier (Essick Air / AIRCARE-branded) does not collect water even though it runs and fan operates.
|
Refrigeration System Failure (Dehumidifier) | View Details |
| – |
Dehumidifier bucket fills too quickly or unit runs constantly in a damp basement.
|
High Moisture Load / Normal Operation Question | View Details |
| – |
Dehumidifier coils freeze over with ice and airflow is reduced.
|
Evaporator Coil Icing (Dehumidifier) | View Details |
| – |
Dehumidifier fan runs but no air is felt at the outlet.
|
Blower Wheel Disconnected or Broken | View Details |
| – |
Dehumidifier shuts off and will not restart until the bucket is removed and reinstalled.
|
Bucket Switch or Float Misalignment | View Details |
| – |
Digital display works but buttons do not respond or only some buttons work.
|
Keypad / Membrane Switch Failure | View Details |
| – |
Humidifier base overfills and water spills out when tank is installed.
|
Float or Level Control Failure | View Details |
| – |
Humidifier base shows heavy white or brown scale buildup; performance is reduced.
|
Mineral Scale Accumulation | View Details |
| – |
Humidifier display is very dim or unreadable, but unit still runs.
|
LED / LCD Display Degradation | View Details |
| – |
Humidifier emits a chemical or plastic burning smell when running.
|
Overheating Electrical Component | View Details |
| – |
Humidifier fan runs but water level in base does not drop; wick remains mostly dry.
|
Wick Not Wicking Water | View Details |
| – |
Humidifier leaks water onto the floor from the base or around the bottle.
|
Water Bottle or Reservoir Leak | View Details |
| – |
Humidifier lights up but fan does not run; no airflow from vents.
|
Fan Motor Failure | View Details |
| – |
Humidifier makes loud grinding, rattling, or squealing noises during operation.
|
Mechanical Noise from Fan or Motor Mounts | View Details |
| – |
Humidifier produces a musty or moldy odor during operation.
|
Microbial Growth in Reservoir and Wick | View Details |
| – |
Humidifier runs but there is little or no visible humidity output; room humidity does not increase.
|
Restricted Wick Evaporation | View Details |
| – |
Humidifier runs continuously and room becomes overly damp or condensation forms on windows.
|
Humidistat Stuck On / Fails to Shut Off | View Details |
| – |
Humidifier shuts off even though the room humidity is below the setpoint.
|
Premature Humidistat Satisfied | View Details |
| – |
Humidifier tank is difficult to remove or install; may stick or not latch properly.
|
Deformed Tank or Worn Tank Guides | View Details |
| – |
Humidifier trips the household circuit breaker or blows a fuse when turned on.
|
Electrical Short or Overload | View Details |
| – |
Humidifier turns on and off rapidly or cycles every few seconds without reaching set humidity.
|
Erratic Humidistat Operation | View Details |
| – |
Humidifier vibrates excessively and may move slightly on the floor or table.
|
Imbalanced Fan or Loose Mounts | View Details |
| – |
Humidifier will not start unless the tank is jiggled or pressed down.
|
Intermittent Water Level or Tank Presence Detection | View Details |
| – |
Humidifier will not turn on at all; no lights or display when plugged in.
|
No Power / Dead Control Board | View Details |
| – |
Water bottle does not empty into the base; unit runs dry quickly and shuts off.
|
Bottle Valve or Airlock Problem | View Details |
No matching codes found
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