Challenge Compressor Not Starting

Dehumidifier fan runs but compressor never starts; no error code.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed compressor start relay/PTC, open overload protector, defective compressor, faulty compressor drive circuit on PCB

How to Fix / Troubleshooting

Safety: Unplug the unit. Capacitors and mains wiring present shock risk.

Steps:

  • Listen for compressor: When turned on, you should hear a distinct hum from the compressor. If silent, suspect start components or PCB.
  • Access compressor terminals: Remove rear panel to reach the compressor electrical box. Inspect for burnt or loose connectors.
  • Test overload and PTC: With a multimeter, check continuity through the overload protector and appropriate resistance across the PTC. Replace with a Challenge compressor start relay/PTC and overload protector if faulty.
  • Check PCB output: If start components are good but compressor never receives voltage, the main PCB may be defective and require replacement.
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Repair Difficulty

Professional Required 5/5

Required Part

Compressor Start Relay / PTC and Overload Protector
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