F40
Hotpoint-Ariston
Mains Supply / Frequency Error
Dryer will not start, F40 displayed, often related to power or mains frequency issues.
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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
Incorrect mains frequency, Unstable power supply, Faulty mains filter board, Loose power connections inside dryer
How to Fix / Troubleshooting
Safety first: Unplug the dryer before opening any covers.
- Verify supply: Ensure the dryer is connected to the correct voltage and frequency as specified on the rating plate (typically 220–240 V, 50 Hz in many regions).
- Avoid generators/inverters: Do not run the dryer from non-sinusoidal inverters or unstable generators that can cause frequency errors.
- Inspect mains filter: Access the mains filter/EMI board where the power cord enters the dryer. Check for burnt components or loose terminals. Replace if damaged.
- Check internal connections: Tighten all screw terminals on the mains input and ensure the earth connection is secure.
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Repair Difficulty
Medium
3/5
Required Part
Mains Filter / Interference Suppression Module
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