Gas hob. All 4 burners don't stay lit sometimes.

[Robert Perkins]

Hi.

I have a hot point gas hob that doesn't always stay lit after ignition.

To light a burner I need to press down the knob and turn it. This activates the ignition switch. The problem is when I let go of the knob it goes out. This applied to all 4 burners.

Usually in the morning it won't work but usually in the evening or lunch time it will work (but not always).

Is this likely to be an issue with the hob itself or something to do the gas supply?

Thanks

 

[Lower]

Try holding the knob down for a bit longer after the burner has lit. The burners probably have flame detection on them and and they sometimes need a bit of time to detect the flame.

 

[Harry Bloomfield]

Not suggesting you try this, but....

Each burner will be fitted with a thermocouple to detect the heat from the flame. The thermocouple will be like a small post, sticking up into the flame. With the flame present, a tiny voltage/current is generated, which is fed to the valve to retain it open, via what might appear to be a tiny copper wire, connected to the valve via a nut.

Because the voltage is so tiny, what can happen is that a little oxide can build up on the terminals, at the nut. Undoing, releasing and retightening the nut, can often be enough to clear the issue.

 

[Robert Perkins]

Thanks for the suggestions. I'll let you know how it goes.