Sharp
Compressor Not Starting / Control or Start Circuit Fault
Dehumidifier powers on but compressor never starts; only fan runs continuously.
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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
Humidity set too high, failed compressor start relay/PTC, open compressor winding, faulty main PCB relay, defective humidity sensor misreading humidity
How to Fix / Troubleshooting
Safety: Unplug before accessing internal components.
Steps:
- Settings check: Set the humidity to a low value (e.g., 40%) and ensure the room is humid enough to call for dehumidification.
- Delay: Many Sharp units have a 3–5 minute compressor delay. Wait to see if it starts.
- Listen and feel: If the compressor never hums or vibrates, inspect the compressor start relay/PTC and wiring.
- Test compressor: With a multimeter, check compressor windings for continuity and shorts to ground.
- Replace start device: If the compressor tests good, replace the start relay/PTC and any run capacitor.
- Control board: If the compressor never receives power, the main PCB relay or control logic may be faulty; replace the main control PCB.
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Repair Difficulty
Hard
4/5
Required Part
Compressor Start Relay / PTC
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