Pilot light cutting out

29 Nov 2005
Reaction score
United Kingdom
Hi Guys

The pilot light for my Potterton Kingfisher boiler remains lit when the HW or CH are not required. However, upon either HW/CH being turned on the burner fires up and starts off heating the water/radiators fine for a few minutes but then suddenly cuts out and extinguishes the pilot light too. I then have to wait a few minutes before I can successfully re-light the pilot light as attempting to do so immediately after it cuts out is not possible as the pilot light does not remain lit once I release the control button.

Is this some problem with the thermocouple?


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Only probably, but since it's cheap to replace you might as well do that and see if it cures the problem.

It's illegal and dangerous to work on a gas appliance unless you're competent.
Thanks - if its not the thermocouple what other possible explanations could there be?
What experience do you have of working on gas appliances?
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I have great experience of watching my regular boiler repairman! However, he is a difficult man to get hold of so narrowing the problem down beforehand is all I am after especially with his charge rate :D
It sounds as if the boiler is overheating and tripping the overheat stat.

Probably a failed pump, might be possible to spin it, see FAQ.

Aviboy said:
I have great experience of watching my regular boiler repairman!
In that case it would be unwise of me to advise you further, save to say that I would expect your regular repairer to home in on the fault very quickly.
I put the pump onto a higher speed and also reduced the boiler stat to a lower setting. All works fine now! Thanks for the non-pedantic advice Tony which was very useful
(remainder deleted)

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