Caple Flame Failure Device Not Holding

Gas burner lights but goes out when the knob is released.

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 faulty thermocouple, Misaligned thermocouple tip, Faulty flame safety valve, Poor thermocouple connection at valve

How to Fix / Troubleshooting

Safety first: Turn off gas supply before adjusting or replacing gas components. Gas work should be done by a qualified engineer.

User checks:

Ensure the burner cap and head are correctly seated so the flame properly heats the thermocouple tip.
Hold the knob in the ignition position for 5–10 seconds after lighting to allow the thermocouple to heat fully.

Technician checks:

Verify the thermocouple tip is directly in the flame and not bent away.
Check the thermocouple connection nut at the flame safety valve is tight.
Measure thermocouple output when heated; replace if output is low.
If a new thermocouple does not resolve the issue, replace the associated safety valve.

Repair Difficulty

Hard 4/5

Required Part

Flame Failure Thermocouple

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