F20
Hotpoint
Heater safety circuit / unexpected temperature rise
Heater safety or unexpected heating detected; F20 displayed.
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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
Stuck heater relay, Shorted heater to live, Faulty NTC sensor reading low, Main control board fault
How to Fix / Troubleshooting
Safety: Unplug immediately if overheating is suspected. Do not use the appliance until checked.
- Inspect heater and wiring: Check for signs of overheating, melting, or short circuits around the heater terminals and wiring.
- Test NTC sensor: Verify the temperature sensor resistance is within specification at room temperature. Replace if reading is abnormally low.
- Check PCB relay: Inspect the heater relay on the main board for welded contacts or burn marks. Replace the PCB if the relay is damaged.
- Professional service: Because this fault involves safety-critical heating control, if you are not experienced with electrical diagnostics, contact a qualified technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board (PCB)
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