Leisure Flame Failure Device / Thermocouple Fault

Leisure gas hob burner will not stay lit when you release the knob, but lights while pressed.

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.

Possible Causes

Weak or failed thermocouple, thermocouple tip not properly in flame, loose thermocouple connection at gas valve, faulty gas valve magnet

How to Fix / Troubleshooting

Safety first: Turn off the gas supply if you suspect a leak. Gas work should be carried out by a qualified engineer.

User-level checks:

Clean the burner cap and base to ensure a stable flame that fully envelops the thermocouple tip.
Ensure the burner cap is correctly seated and not blocking flame ports.

Technical checks (engineer):

Inspect the thermocouple tip position relative to the flame; adjust if necessary.
Check the thermocouple connection at the gas tap / valve for tightness.
Test thermocouple output and replace the thermocouple if it does not generate sufficient voltage.
If a new thermocouple does not resolve the issue, the gas valve magnet unit may be faulty and require replacement.

Repair Difficulty

Hard 4/5

Required Part

Hob Thermocouple

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