F08
Hotpoint-Ariston
Heater Relay Stuck On/Off or Heater Circuit Error
Machine fills but does not heat; may stop mid-cycle with F08 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
Shorted heater element, Stuck heater relay on control board, Wiring short to chassis, Faulty NTC sensor causing incorrect heater control
How to Fix / Troubleshooting
Safety: Disconnect power and ensure the tub is cool.
- Inspect heater and wiring:
- Access the wash heater from the rear.
- Check for visible damage, burn marks, or melted insulation.
- Test heater resistance and insulation:
- Disconnect heater wires.
- Measure resistance across the heater; if extremely low or shorted, replace the heater.
- Check for continuity between heater terminals and earth; any reading indicates a short to chassis.
- Check NTC sensor: A faulty NTC can cause the control to mismanage heating; test and replace if out of spec.
- If components test OK: The heater relay on the main control board may be stuck or damaged; replace the control board.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board (Heater Relay Circuit)
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