Trotec
Trotec 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; display shows E1 shortly after power-on.
Room Temperature Sensor Fault
E2
Dehumidifier stops and displays E2; fan may still run briefly.
Evaporator Coil Temperature Sensor Fault
E3
Dehumidifier shows E3 and stops dehumidifying; compressor does not start.
Humidity Sensor (RH Sensor) Fault
E4
Dehumidifier displays E4 and shuts down; may occur after running for some time.
Refrigerant System / Defrost Protection Fault
E5
Dehumidifier shows E5 and will not start the compressor.
Compressor Overload / High Temperature Protection
E6
Dehumidifier displays E6; unit may run fan but not dehumidify properly.
Communication Error Between Display Board and Main PCB
E7
Dehumidifier shows E7 and stops; may occur when trying to start compressor.
Compressor Start Failure / Current Protection
E8
Dehumidifier displays E8 and stops; fan may continue to run.
Fan Motor Fault / Fan Feedback Error
E9
Dehumidifier shows E9 and will not operate.
Internal Memory / EEPROM Error
EC
Dehumidifier displays EC and stops cooling; fan may still run.
Refrigerant Leak / Low Refrigerant Protection
F0
Humidifier displays F0 and stops producing mist.
Water Level Sensor Fault (Humidifier)
F1
Humidifier shows F1 and will not run the fan or mist generator.
Room Temperature Sensor Fault (Humidifier)
F2
Humidifier displays F2; unit may run fan but no mist is produced.
Humidity Sensor Fault (Humidifier)
F3
Humidifier shows F3 and stops; fan may not run.
Fan Motor Fault (Humidifier)
F4
Humidifier displays F4 and stops producing mist.
Ultrasonic Transducer / Heater Fault
F5
Humidifier shows F5; unit may shut down shortly after start.
Overheat Protection / Base Temperature Fault
HI
Dehumidifier or humidifier display shows HI and may not control humidity correctly.
High Humidity or Sensor Overrange Indication
LO
Dehumidifier or humidifier display shows LO and will not start normal operation.
Low Ambient Temperature Lockout
P1
Dehumidifier shows P1 and stops; water tank is empty or partially filled.
Defrost Mode Active / Low Coil Temperature
P2
Dehumidifier displays P2 and stops; water tank may be full or connected to drain hose.
Water Tank Full / Tank Switch Activated
P3
Dehumidifier shows P3 and stops; often related to pump-equipped models.
Condensate Pump Fault / Pump Overflow Protection
Symptom
Control buttons on the Trotec dehumidifier or humidifier do not respond or respond intermittently.
Keypad / Control Panel Failure
Symptom
Dehumidifier does not turn on at all; no lights or display.
No Power / Dead Unit
Symptom
Dehumidifier fan does not run, but compressor becomes very hot and unit shuts down.
Fan Failure Causing Overheating
Symptom
Dehumidifier or humidifier emits a musty or moldy odor during operation.
Microbial Growth in Water Path or Air Path
Symptom
Dehumidifier or humidifier makes loud rattling or grinding noises during operation.
Mechanical Noise / Fan or Compressor Vibration
Symptom
Dehumidifier or humidifier vibrates excessively and may move on the floor.
Excessive Vibration / Imbalanced Fan or Mounting
Symptom
Dehumidifier powers on but compressor never starts; only fan runs continuously.
Compressor Not Engaging
Symptom
Dehumidifier runs but does not collect water; humidity in the room remains high.
Insufficient Dehumidification / Loss of Cooling Capacity
Symptom
Dehumidifier stops frequently and the water tank is not full; tank full indicator is on.
False Tank Full Detection
Symptom
Display is dim, flickering, or completely blank, but the unit still runs.
Display Module / Backlight Failure
Symptom
Humidifier emits a white dust on nearby surfaces.
Mineral Dust Emission
Symptom
Humidifier is very loud with a high-pitched whine or buzzing from the transducer area.
Ultrasonic Transducer Noise
Symptom
Humidifier leaks water around the base or onto nearby surfaces.
Humidifier Base Leak / Tank Seal Failure
Symptom
Humidifier or dehumidifier has a burning smell or visible smoke.
Electrical Overheating / Component Failure
Symptom
Humidifier runs but produces very little or no visible mist.
Low Mist Output / Ultrasonic Inefficiency
Symptom
Humidifier shuts off after a few minutes even though the tank is full and no error code is shown.
Overheat or Level Protection Cycling
Symptom
Water leaking from the bottom of the dehumidifier onto the floor.
Water Leak / Drainage Fault
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E1 |
Dehumidifier will not start; display shows E1 shortly after power-on.
|
Room Temperature Sensor Fault | View Details |
| E2 |
Dehumidifier stops and displays E2; fan may still run briefly.
|
Evaporator Coil Temperature Sensor Fault | View Details |
| E3 |
Dehumidifier shows E3 and stops dehumidifying; compressor does not start.
|
Humidity Sensor (RH Sensor) Fault | View Details |
| E4 |
Dehumidifier displays E4 and shuts down; may occur after running for some time.
|
Refrigerant System / Defrost Protection Fault | View Details |
| E5 |
Dehumidifier shows E5 and will not start the compressor.
|
Compressor Overload / High Temperature Protection | View Details |
| E6 |
Dehumidifier displays E6; unit may run fan but not dehumidify properly.
|
Communication Error Between Display Board and Main PCB | View Details |
| E7 |
Dehumidifier shows E7 and stops; may occur when trying to start compressor.
|
Compressor Start Failure / Current Protection | View Details |
| E8 |
Dehumidifier displays E8 and stops; fan may continue to run.
|
Fan Motor Fault / Fan Feedback Error | View Details |
| E9 |
Dehumidifier shows E9 and will not operate.
|
Internal Memory / EEPROM Error | View Details |
| EC |
Dehumidifier displays EC and stops cooling; fan may still run.
|
Refrigerant Leak / Low Refrigerant Protection | View Details |
| F0 |
Humidifier displays F0 and stops producing mist.
|
Water Level Sensor Fault (Humidifier) | View Details |
| F1 |
Humidifier shows F1 and will not run the fan or mist generator.
|
Room Temperature Sensor Fault (Humidifier) | View Details |
| F2 |
Humidifier displays F2; unit may run fan but no mist is produced.
|
Humidity Sensor Fault (Humidifier) | View Details |
| F3 |
Humidifier shows F3 and stops; fan may not run.
|
Fan Motor Fault (Humidifier) | View Details |
| F4 |
Humidifier displays F4 and stops producing mist.
|
Ultrasonic Transducer / Heater Fault | View Details |
| F5 |
Humidifier shows F5; unit may shut down shortly after start.
|
Overheat Protection / Base Temperature Fault | View Details |
| HI |
Dehumidifier or humidifier display shows HI and may not control humidity correctly.
|
High Humidity or Sensor Overrange Indication | View Details |
| LO |
Dehumidifier or humidifier display shows LO and will not start normal operation.
|
Low Ambient Temperature Lockout | View Details |
| P1 |
Dehumidifier shows P1 and stops; water tank is empty or partially filled.
|
Defrost Mode Active / Low Coil Temperature | View Details |
| P2 |
Dehumidifier displays P2 and stops; water tank may be full or connected to drain hose.
|
Water Tank Full / Tank Switch Activated | View Details |
| P3 |
Dehumidifier shows P3 and stops; often related to pump-equipped models.
|
Condensate Pump Fault / Pump Overflow Protection | View Details |
| – |
Control buttons on the Trotec dehumidifier or humidifier do not respond or respond intermittently.
|
Keypad / Control Panel Failure | View Details |
| – |
Dehumidifier does not turn on at all; no lights or display.
|
No Power / Dead Unit | View Details |
| – |
Dehumidifier fan does not run, but compressor becomes very hot and unit shuts down.
|
Fan Failure Causing Overheating | View Details |
| – |
Dehumidifier or humidifier emits a musty or moldy odor during operation.
|
Microbial Growth in Water Path or Air Path | View Details |
| – |
Dehumidifier or humidifier makes loud rattling or grinding noises during operation.
|
Mechanical Noise / Fan or Compressor Vibration | View Details |
| – |
Dehumidifier or humidifier vibrates excessively and may move on the floor.
|
Excessive Vibration / Imbalanced Fan or Mounting | View Details |
| – |
Dehumidifier powers on but compressor never starts; only fan runs continuously.
|
Compressor Not Engaging | View Details |
| – |
Dehumidifier runs but does not collect water; humidity in the room remains high.
|
Insufficient Dehumidification / Loss of Cooling Capacity | View Details |
| – |
Dehumidifier stops frequently and the water tank is not full; tank full indicator is on.
|
False Tank Full Detection | View Details |
| – |
Display is dim, flickering, or completely blank, but the unit still runs.
|
Display Module / Backlight Failure | View Details |
| – |
Humidifier emits a white dust on nearby surfaces.
|
Mineral Dust Emission | View Details |
| – |
Humidifier is very loud with a high-pitched whine or buzzing from the transducer area.
|
Ultrasonic Transducer Noise | View Details |
| – |
Humidifier leaks water around the base or onto nearby surfaces.
|
Humidifier Base Leak / Tank Seal Failure | View Details |
| – |
Humidifier or dehumidifier has a burning smell or visible smoke.
|
Electrical Overheating / Component Failure | View Details |
| – |
Humidifier runs but produces very little or no visible mist.
|
Low Mist Output / Ultrasonic Inefficiency | View Details |
| – |
Humidifier shuts off after a few minutes even though the tank is full and no error code is shown.
|
Overheat or Level Protection Cycling | View Details |
| – |
Water leaking from the bottom of the dehumidifier onto the floor.
|
Water Leak / Drainage Fault | View Details |
No matching codes found
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