Ariston
Hard Starting Compressor / Start Circuit Failure
Dehumidifier fan runs but compressor cycles on and off rapidly or hums loudly without starting
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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
Weak or failed PTC start relay, Faulty overload protector, High starting torque due to aging compressor, Low supply voltage
How to Fix / Troubleshooting
Safety: Unplug the unit and wait several minutes before touching the compressor area; components may be hot.
Steps to address hard starting:
- 1. Verify supply voltage: Avoid using long extension cords. Plug directly into a properly grounded outlet.
- 2. Access compressor terminals: Remove the rear panel and compressor terminal cover.
- 3. Inspect PTC and overload: Check for discoloration, cracks, or melting on the compressor start relay/PTC and overload protector. Replace if damaged.
- 4. Test operation: After replacing start components, reassemble and run the unit. If the compressor still hums and trips, the compressor itself may be failing.
- 5. Professional evaluation: A technician can measure compressor current and winding resistance to confirm if compressor replacement is required.
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Repair Difficulty
Hard
4/5
Required Part
Compressor Start Relay/PTC
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