Dehumidifier powers on but compressor never starts, fan runs only

Safety: Unplug the unit and discharge any capacitors before touching compressor wiring. High voltage is present.

Steps:

• Listen for compressor: When the unit calls for dehumidification, you should hear a low hum from the compressor. If there is only fan noise, continue.
• Check for error codes: If none are displayed, remove the rear cover to access the compressor area.
• Inspect start device: The start relay/PTC is attached to the compressor terminals. Look for burn marks or melted plastic. Replace the compressor start relay/PTC if damaged.
• Run capacitor (if present): Some models use a capacitor. If bulged or leaking, replace the compressor run capacitor with the same µF rating and voltage.
• Advanced testing: If the compressor still does not start, testing windings and current draw should be done by a professional. A failed compressor or main board may need replacement.