Problems with central heating & hot water boiler

[mfdinham]

I have a GLOW-WORM Fuelsaver F. The problem is every now and again the boiler will not light and so the hot water is not getting hot. There is a little reset button at the bottom and when pressed this makes it work for a certain amount of time. Is there anything I can do myself or do I need to call in the experts?

[Tweed]

There could be air in the fuel pipe, or even dirt.