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Heytesto you are a star, thanks very much, its been bugging me for ages

Just had a thought that aps is air pressure switch, I will have a look at this, Btw is that how the boiler knows that the pilot is lit ?

Thanks for the reply, but what is the aps? cheers Stew

Hi, My boiler often has a spell where it fires up for a few seconds then the main flame and pilot goes out then immediately fires up again, it can do this for ages. I have noticed that whilst lit the pilot lit indicator flickers on and off which kind of suggests that it is loosing a signal...