Tosot
Compressor Control Circuit Failure
Dehumidifier fan runs but compressor never starts; unit blows room-temperature air only.
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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
Failed main control board relay for compressor, Open thermal fuse or wiring to compressor, Faulty compressor capacitor (if used), Safety sensor preventing compressor start
How to Fix / Troubleshooting
Safety: Unplug before opening the cabinet.
Steps:
- Check modes and settings: Ensure the humidity setpoint is below current room humidity and that the unit is not in fan-only mode.
- Listen for relay: When the unit calls for dehumidification, you should hear a click from the control board. No click may indicate a bad relay or board.
- Inspect wiring: Trace wires from the main PCB to the compressor. Look for loose connectors or burnt wires.
- Capacitor check: If your Tosot model uses a run capacitor for the compressor, inspect it for bulging or leaks. Replace the compressor run capacitor if suspect.
- Board replacement: If wiring and capacitor are good but the board never sends power to the compressor, replace the main control board.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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