New World
Flame Supervision Device Failure
Gas hob burner flame goes out when knob is released
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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
Faulty thermocouple, misaligned thermocouple tip, weak magnet in gas valve, poor thermocouple connection at valve
How to Fix / Troubleshooting
Safety: Gas safety is critical. If unsure, use a Gas Safe registered engineer.
- Lighting test: Press and hold the knob to light the burner. Keep it held for 10–15 seconds. If the flame goes out when released, the FSD is not holding.
- Check thermocouple position: Ensure the thermocouple tip is directly in the flame. Gently adjust its position if bent away.
- Clean tip: Lightly clean the thermocouple tip with fine abrasive pad to remove soot.
- Replace thermocouple: If the problem persists, the thermocouple is likely faulty. Replacement involves removing the hob top, disconnecting the old thermocouple from the gas valve, and fitting a new one.
- Gas valve: If a new thermocouple does not cure the issue, the gas valve magnet may be defective and the valve should be replaced by a qualified engineer.
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Repair Difficulty
Hard
4/5
Required Part
Hob Thermocouple (Flame Failure Device)
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