Honeywell
Honeywell 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
Dehumidifier displays "CF" after a set number of hours; unit may continue to run but indicates maintenance is needed.
Filter Cleaning Reminder
E0
Dehumidifier shows E0 and does not respond to button presses or will not start.
Keypad / Control Panel Communication Error
E1
Dehumidifier displays E1 and stops dehumidifying; fan may still run but compressor does not start.
Room Temperature Sensor Failure
E2
Dehumidifier shows E2 and will not run or cycles off quickly; bucket is empty or partially full.
Evaporator Coil Temperature Sensor Failure
E3
Dehumidifier displays E3 and shuts down or fails to start the compressor; fan may operate.
Humidity Sensor (RH Sensor) Failure
E4
Dehumidifier shows E4 and stops; unit may beep and refuse to start a cycle.
Defrost Sensor or Refrigeration System Fault
E5
Dehumidifier displays E5 and will not start; sometimes accompanied by clicking from the control board or relay.
Compressor Overload or Current Protection Fault
E6
Dehumidifier shows E6 and stops; fan may or may not run.
Internal Communication or Control Board Fault
E7
Dehumidifier displays E7 and will not operate; sometimes appears after a power outage.
EEPROM / Memory Error
E8
Dehumidifier shows E8 and shuts down; may be accompanied by unusually hot air discharge.
High Temperature Protection / Overheat Fault
E9
Dehumidifier displays E9 and stops; bucket is correctly installed and not full.
Bucket Full / Float Switch Circuit Error
EC
Dehumidifier displays "EC" and stops cooling; fan may still run but no water is collected.
Refrigerant System or Sensor Error
HI
Dehumidifier display shows "HI" for humidity and may run continuously.
High Humidity or Humidity Sensor Out of Range
LO
Dehumidifier display shows "LO" and the unit does not run or runs intermittently.
Low Ambient Temperature Lockout
Symptom
Dehumidifier coils freeze over with ice during operation; airflow is reduced and water collection stops.
Evaporator Coil Icing
Symptom
Dehumidifier continuous drain feature does not work; water still fills the bucket instead of draining through the hose.
Continuous Drain Failure
Symptom
Dehumidifier display and lights work, but buttons do not respond or respond intermittently.
Unresponsive Keypad / Control Panel
Symptom
Dehumidifier display is dim, flickering, or segments are missing, but the unit otherwise runs.
Display / LED Failure
Symptom
Dehumidifier emits a burning or electrical smell when running.
Overheating Electrical Component
Symptom
Dehumidifier emits a musty or moldy odor during operation.
Biological Growth in Water Path
Symptom
Dehumidifier fan does not run, but compressor attempts to start; unit overheats or shuts down.
Fan Motor Failure
Symptom
Dehumidifier fan runs but compressor never starts; air is not cooled and little water is collected.
Compressor Start Failure
Symptom
Dehumidifier hums loudly but neither the fan nor compressor starts; then shuts off.
Stalled Motor or Locked Compressor
Symptom
Dehumidifier indicates bucket full even when the bucket is empty and correctly installed.
False Bucket Full Indication
Symptom
Dehumidifier is very noisy during operation; rattling, buzzing, or grinding sounds are heard.
Excessive Noise / Vibration
Symptom
Dehumidifier leaks water onto the floor instead of into the bucket or drain hose.
Water Leakage
Symptom
Dehumidifier operates but blows warm, humid air; room feels hotter and not drier.
Ineffective Moisture Removal
Symptom
Dehumidifier powers on but compressor and fan do not start; only the display works.
Control Logic or Safety Interlock Not Satisfied
Symptom
Dehumidifier runs but does not collect water; bucket remains dry even after hours of operation.
No Dehumidification / Refrigeration Failure
Symptom
Dehumidifier runs but very little water is collected compared to previous performance.
Reduced Dehumidification Capacity
Symptom
Dehumidifier runs continuously and never reaches the set humidity; room still feels damp.
Inability to Reach Setpoint
Symptom
Dehumidifier shuts off after a few minutes and restarts frequently; does not maintain continuous operation.
Short Cycling
Symptom
Dehumidifier trips the circuit breaker or GFCI outlet when starting or shortly after.
Overcurrent or Ground Fault
Symptom
Dehumidifier will not power on at all; no lights or display.
No Power / Dead Unit
Symptom
Humidifier (Honeywell console or portable) does not produce visible mist or increase humidity.
No Humidification Output
Symptom
Humidifier is very loud or rattles during operation.
Humidifier Fan or Impeller Noise
Symptom
Humidifier leaks water from the base or around the tank.
Humidifier Water Leakage
Symptom
Humidifier produces white dust on nearby surfaces.
Mineral Dust Emission (Ultrasonic Models)
Symptom
Humidifier runs but water level in the tank does not drop; no moisture added to room.
Water Not Feeding to Base
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| CF |
Dehumidifier displays "CF" after a set number of hours; unit may continue to run but indicates maintenance is needed.
|
Filter Cleaning Reminder | View Details |
| E0 |
Dehumidifier shows E0 and does not respond to button presses or will not start.
|
Keypad / Control Panel Communication Error | View Details |
| E1 |
Dehumidifier displays E1 and stops dehumidifying; fan may still run but compressor does not start.
|
Room Temperature Sensor Failure | View Details |
| E2 |
Dehumidifier shows E2 and will not run or cycles off quickly; bucket is empty or partially full.
|
Evaporator Coil Temperature Sensor Failure | View Details |
| E3 |
Dehumidifier displays E3 and shuts down or fails to start the compressor; fan may operate.
|
Humidity Sensor (RH Sensor) Failure | View Details |
| E4 |
Dehumidifier shows E4 and stops; unit may beep and refuse to start a cycle.
|
Defrost Sensor or Refrigeration System Fault | View Details |
| E5 |
Dehumidifier displays E5 and will not start; sometimes accompanied by clicking from the control board or relay.
|
Compressor Overload or Current Protection Fault | View Details |
| E6 |
Dehumidifier shows E6 and stops; fan may or may not run.
|
Internal Communication or Control Board Fault | View Details |
| E7 |
Dehumidifier displays E7 and will not operate; sometimes appears after a power outage.
|
EEPROM / Memory Error | View Details |
| E8 |
Dehumidifier shows E8 and shuts down; may be accompanied by unusually hot air discharge.
|
High Temperature Protection / Overheat Fault | View Details |
| E9 |
Dehumidifier displays E9 and stops; bucket is correctly installed and not full.
|
Bucket Full / Float Switch Circuit Error | View Details |
| EC |
Dehumidifier displays "EC" and stops cooling; fan may still run but no water is collected.
|
Refrigerant System or Sensor Error | View Details |
| HI |
Dehumidifier display shows "HI" for humidity and may run continuously.
|
High Humidity or Humidity Sensor Out of Range | View Details |
| LO |
Dehumidifier display shows "LO" and the unit does not run or runs intermittently.
|
Low Ambient Temperature Lockout | View Details |
| – |
Dehumidifier coils freeze over with ice during operation; airflow is reduced and water collection stops.
|
Evaporator Coil Icing | View Details |
| – |
Dehumidifier continuous drain feature does not work; water still fills the bucket instead of draining through the hose.
|
Continuous Drain Failure | View Details |
| – |
Dehumidifier display and lights work, but buttons do not respond or respond intermittently.
|
Unresponsive Keypad / Control Panel | View Details |
| – |
Dehumidifier display is dim, flickering, or segments are missing, but the unit otherwise runs.
|
Display / LED Failure | View Details |
| – |
Dehumidifier emits a burning or electrical smell when running.
|
Overheating Electrical Component | View Details |
| – |
Dehumidifier emits a musty or moldy odor during operation.
|
Biological Growth in Water Path | View Details |
| – |
Dehumidifier fan does not run, but compressor attempts to start; unit overheats or shuts down.
|
Fan Motor Failure | View Details |
| – |
Dehumidifier fan runs but compressor never starts; air is not cooled and little water is collected.
|
Compressor Start Failure | View Details |
| – |
Dehumidifier hums loudly but neither the fan nor compressor starts; then shuts off.
|
Stalled Motor or Locked Compressor | View Details |
| – |
Dehumidifier indicates bucket full even when the bucket is empty and correctly installed.
|
False Bucket Full Indication | View Details |
| – |
Dehumidifier is very noisy during operation; rattling, buzzing, or grinding sounds are heard.
|
Excessive Noise / Vibration | View Details |
| – |
Dehumidifier leaks water onto the floor instead of into the bucket or drain hose.
|
Water Leakage | View Details |
| – |
Dehumidifier operates but blows warm, humid air; room feels hotter and not drier.
|
Ineffective Moisture Removal | View Details |
| – |
Dehumidifier powers on but compressor and fan do not start; only the display works.
|
Control Logic or Safety Interlock Not Satisfied | View Details |
| – |
Dehumidifier runs but does not collect water; bucket remains dry even after hours of operation.
|
No Dehumidification / Refrigeration Failure | View Details |
| – |
Dehumidifier runs but very little water is collected compared to previous performance.
|
Reduced Dehumidification Capacity | View Details |
| – |
Dehumidifier runs continuously and never reaches the set humidity; room still feels damp.
|
Inability to Reach Setpoint | View Details |
| – |
Dehumidifier shuts off after a few minutes and restarts frequently; does not maintain continuous operation.
|
Short Cycling | View Details |
| – |
Dehumidifier trips the circuit breaker or GFCI outlet when starting or shortly after.
|
Overcurrent or Ground Fault | View Details |
| – |
Dehumidifier will not power on at all; no lights or display.
|
No Power / Dead Unit | View Details |
| – |
Humidifier (Honeywell console or portable) does not produce visible mist or increase humidity.
|
No Humidification Output | View Details |
| – |
Humidifier is very loud or rattles during operation.
|
Humidifier Fan or Impeller Noise | View Details |
| – |
Humidifier leaks water from the base or around the tank.
|
Humidifier Water Leakage | View Details |
| – |
Humidifier produces white dust on nearby surfaces.
|
Mineral Dust Emission (Ultrasonic Models) | View Details |
| – |
Humidifier runs but water level in the tank does not drop; no moisture added to room.
|
Water Not Feeding to Base | View Details |
No matching codes found
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