Dehumidifier fan runs but compressor never starts, no water is collected.

Safety: Unplug the unit. High voltage is present around the compressor terminals.

• Listen for clicks: When the unit calls for dehumidification, you may hear a click from the relay but no compressor hum. Repeated clicking can indicate a start problem.
• Check ambient temperature: Ensure the room is not too cold; some units will not start the compressor below a certain temperature.
• Advanced diagnosis: A technician can test the start relay, capacitor, and compressor windings with a multimeter.
• Repair: Replace the start relay or capacitor if faulty. If the compressor windings are open or shorted, the compressor and sealed system must be serviced by a professional.