Dehumidifier powers on but compressor never starts (fan runs only)

Safety: Unplug the unit. Compressor terminals carry mains voltage.

Steps to troubleshoot compressor not starting:

• Verify settings: Ensure the humidity setpoint is below current room humidity and that the unit is not in defrost mode.
• Listen for clicks: When the compressor should start, listen for a click from the relay followed by a hum. Repeated clicking without running suggests start component issues.
• Access compressor terminals: Remove the compressor cover and inspect the start relay and overload protector for burn marks or cracks.
• Test start relay and overload: With a meter, check continuity according to Whirlpool specs. Replace any component that tests open or shows signs of overheating.
• Check compressor windings: Measure resistance between the three compressor terminals (C, R, S). Open or shorted windings indicate a failed compressor.
• Control board output: If components and compressor test good, the main board may not be sending power to the compressor. Board replacement may be required.

Test: After replacing start components or board, reassemble and run the unit. Confirm that the compressor starts and the unit begins collecting water.