Dehumidifier powers on but compressor never starts; only the fan runs and no water is collected.

Safety first: Unplug the unit. Do not attempt to open the sealed compressor.

• Check settings: Ensure the humidity setpoint is below the current room humidity and that the unit is not in fan-only mode.
• Listen for compressor: When starting, you should hear a low hum from the compressor. No sound at all may indicate a control or relay issue.
• Inspect wiring: Remove the rear panel and inspect the wiring to the compressor, start relay, and overload protector for burns or loose connections.
• Component replacement: If you have experience and tools, you can test the start relay and overload for continuity and replace them if open or burned. Otherwise, contact a technician.
• Professional diagnosis: If the compressor windings are open or shorted, or if the main PCB is not energizing the compressor, professional service is required.