Challenge
Challenge 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 run; display shows E1 shortly after power-on.
Room Temperature Sensor Failure
E2
Dehumidifier stops and displays E2; fan may still run briefly.
Evaporator Coil Temperature Sensor Failure
E3
Dehumidifier beeps and shows E3; compressor does not start.
Humidity Sensor (RH Sensor) Failure
E4
Dehumidifier stops mid-cycle and displays E4; unit may beep repeatedly.
Refrigeration System Protection / High or Low Temperature Fault
E5
Dehumidifier shows E5 and will not start the compressor.
Compressor Overload or Current Protection Fault
E6
Dehumidifier displays E6; controls may be unresponsive or erratic.
Control Panel Communication Error
E7
Dehumidifier shows E7 and shuts down; fan may still operate.
Defrost Sensor or Defrost Circuit Fault
E8
Dehumidifier displays E8; unit may not respond to button presses.
EEPROM / Memory Error on Main PCB
E9
Dehumidifier shows E9 and will not start; bucket appears correctly installed.
Water Level / Float Switch Circuit Fault
F0
Humidifier or dehumidifier shows F0 and stops operating.
General Sensor Fault / Sensor Circuit Open
F1
Humidifier displays F1; fan may run but no humidification.
Humidity Sensor Circuit Error
F2
Humidifier or dehumidifier shows F2 and stops; may occur in very cold or hot rooms.
Ambient Temperature Out of Range
H1
Humidifier shows H1 and stops adding moisture.
Water Tank Empty or Tank Switch Open
H2
Humidifier displays H2; unit may shut off shortly after starting.
Over-Humidity or Sensor Calibration Error
HI
Display shows HI for humidity; unit may run continuously.
High Humidity Indication / Sensor Out of Range High
LO
Display shows LO and dehumidifier does not start the compressor.
Low Temperature Lockout
P1
Dehumidifier displays P1 and does not start dehumidifying.
Defrost Mode Active / Low Temperature Protection
P2
Dehumidifier displays P2 and stops collecting water; bucket may be empty.
Bucket Full / Drain Protection Status
Symptom
Controls or buttons on the humidifier/dehumidifier do not respond or respond intermittently.
Keypad / Control Panel Failure
Symptom
Dehumidifier display works but settings change by themselves or humidity reading jumps erratically.
Erratic Humidity Reading / Control Instability
Symptom
Dehumidifier does not power on at all; no lights or display.
No Power / Dead Unit
Symptom
Dehumidifier fan runs but compressor never starts; no error code.
Compressor Not Starting
Symptom
Dehumidifier makes loud rattling or grinding noises during operation.
Mechanical Noise / Vibration Fault
Symptom
Dehumidifier or humidifier emits a burning smell or visible smoke.
Electrical Overheating / Component Burnout
Symptom
Dehumidifier powers on but fan does not run; compressor may or may not start.
Fan Motor Failure
Symptom
Dehumidifier runs but collects little or no water even in a damp room.
Poor Dehumidification / Loss of Capacity
Symptom
Dehumidifier runs but ice builds up heavily on the evaporator coil.
Evaporator Coil Icing
Symptom
Dehumidifier shuts off after a short time and the bucket is not full; no error code displayed.
Premature Shutdown / Overheat or Float Mis-detection
Symptom
Dehumidifier vibrates excessively and may move on the floor during operation.
Excessive Vibration
Symptom
Humidifier emits an unpleasant or musty smell during operation.
Odor / Microbial Growth
Symptom
Humidifier is very loud or makes buzzing sounds.
Humidifier Fan or Ultrasonic Module Noise
Symptom
Humidifier leaks water around the base or onto the table.
Humidifier Water Leakage
Symptom
Humidifier or dehumidifier trips the household circuit breaker or blows fuses.
Overcurrent / Short Circuit
Symptom
Humidifier runs but produces little or no visible mist.
Low Humidification Output
Symptom
Water leaks from the bottom or sides of the dehumidifier instead of into the bucket.
Water Leakage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Dehumidifier will not run; display shows E1 shortly after power-on.
|
Room Temperature Sensor Failure | View Details |
| E2 |
Dehumidifier stops and displays E2; fan may still run briefly.
|
Evaporator Coil Temperature Sensor Failure | View Details |
| E3 |
Dehumidifier beeps and shows E3; compressor does not start.
|
Humidity Sensor (RH Sensor) Failure | View Details |
| E4 |
Dehumidifier stops mid-cycle and displays E4; unit may beep repeatedly.
|
Refrigeration System Protection / High or Low Temperature Fault | View Details |
| E5 |
Dehumidifier shows E5 and will not start the compressor.
|
Compressor Overload or Current Protection Fault | View Details |
| E6 |
Dehumidifier displays E6; controls may be unresponsive or erratic.
|
Control Panel Communication Error | View Details |
| E7 |
Dehumidifier shows E7 and shuts down; fan may still operate.
|
Defrost Sensor or Defrost Circuit Fault | View Details |
| E8 |
Dehumidifier displays E8; unit may not respond to button presses.
|
EEPROM / Memory Error on Main PCB | View Details |
| E9 |
Dehumidifier shows E9 and will not start; bucket appears correctly installed.
|
Water Level / Float Switch Circuit Fault | View Details |
| F0 |
Humidifier or dehumidifier shows F0 and stops operating.
|
General Sensor Fault / Sensor Circuit Open | View Details |
| F1 |
Humidifier displays F1; fan may run but no humidification.
|
Humidity Sensor Circuit Error | View Details |
| F2 |
Humidifier or dehumidifier shows F2 and stops; may occur in very cold or hot rooms.
|
Ambient Temperature Out of Range | View Details |
| H1 |
Humidifier shows H1 and stops adding moisture.
|
Water Tank Empty or Tank Switch Open | View Details |
| H2 |
Humidifier displays H2; unit may shut off shortly after starting.
|
Over-Humidity or Sensor Calibration Error | View Details |
| HI |
Display shows HI for humidity; unit may run continuously.
|
High Humidity Indication / Sensor Out of Range High | View Details |
| LO |
Display shows LO and dehumidifier does not start the compressor.
|
Low Temperature Lockout | View Details |
| P1 |
Dehumidifier displays P1 and does not start dehumidifying.
|
Defrost Mode Active / Low Temperature Protection | View Details |
| P2 |
Dehumidifier displays P2 and stops collecting water; bucket may be empty.
|
Bucket Full / Drain Protection Status | View Details |
| – |
Controls or buttons on the humidifier/dehumidifier do not respond or respond intermittently.
|
Keypad / Control Panel Failure | View Details |
| – |
Dehumidifier display works but settings change by themselves or humidity reading jumps erratically.
|
Erratic Humidity Reading / Control Instability | View Details |
| – |
Dehumidifier does not power on at all; no lights or display.
|
No Power / Dead Unit | View Details |
| – |
Dehumidifier fan runs but compressor never starts; no error code.
|
Compressor Not Starting | View Details |
| – |
Dehumidifier makes loud rattling or grinding noises during operation.
|
Mechanical Noise / Vibration Fault | View Details |
| – |
Dehumidifier or humidifier emits a burning smell or visible smoke.
|
Electrical Overheating / Component Burnout | View Details |
| – |
Dehumidifier powers on but fan does not run; compressor may or may not start.
|
Fan Motor Failure | View Details |
| – |
Dehumidifier runs but collects little or no water even in a damp room.
|
Poor Dehumidification / Loss of Capacity | View Details |
| – |
Dehumidifier runs but ice builds up heavily on the evaporator coil.
|
Evaporator Coil Icing | View Details |
| – |
Dehumidifier shuts off after a short time and the bucket is not full; no error code displayed.
|
Premature Shutdown / Overheat or Float Mis-detection | View Details |
| – |
Dehumidifier vibrates excessively and may move on the floor during operation.
|
Excessive Vibration | View Details |
| – |
Humidifier emits an unpleasant or musty smell during operation.
|
Odor / Microbial Growth | View Details |
| – |
Humidifier is very loud or makes buzzing sounds.
|
Humidifier Fan or Ultrasonic Module Noise | View Details |
| – |
Humidifier leaks water around the base or onto the table.
|
Humidifier Water Leakage | View Details |
| – |
Humidifier or dehumidifier trips the household circuit breaker or blows fuses.
|
Overcurrent / Short Circuit | View Details |
| – |
Humidifier runs but produces little or no visible mist.
|
Low Humidification Output | View Details |
| – |
Water leaks from the bottom or sides of the dehumidifier instead of into the bucket.
|
Water Leakage | View Details |
No matching codes found
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