Trotec
Compressor Not Engaging
Dehumidifier powers on but compressor never starts; only fan runs continuously.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Humidity setpoint too high, Faulty compressor relay on PCB, Failed compressor start components, Open thermal overload on compressor
How to Fix / Troubleshooting
Safety: Unplug before internal inspection. High voltage is present around the compressor circuit.
Steps:
- Check settings: Set the target humidity to a low value (e.g., 40%) and ensure the room humidity is higher.
- Tank and sensors: Confirm the water tank is correctly installed and no error lights are on.
- Listen for relay click: When the unit calls for dehumidification, you should hear a click from the main PCB. No click may indicate a bad relay or control signal.
- Inspect compressor wiring: Check connections at the compressor terminals and start relay/PTC.
- Test compressor and relay: Using a multimeter, verify the compressor windings and that the relay is delivering power when commanded. Replace the start relay/PTC or main PCB as needed.
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Repair Difficulty
Hard
4/5
Required Part
Compressor Start Relay/PTC
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