Unit powers on but compressor never starts; only the fan runs continuously.

Safety first: Unplug the unit and discharge capacitors before testing.

• Listen for relay click: When turning on dehumidification, listen for a click from the main PCB. No click may indicate a control board issue.
• Check overload and PTC (if equipped): Access the compressor terminal cover and inspect the overload protector and PTC relay. Replace if burnt or cracked.
• Measure compressor windings: With wires removed, measure resistance between compressor terminals. Open windings indicate a failed compressor.
• Board inspection: Look for burnt relay contacts or traces on the main PCB. Replace the board if damaged.
• Professional service: If the compressor is electrically sound but will not start, an inverter or internal mechanical failure may be present; contact a refrigeration technician.