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My Glow Worm 50 is not heating the radiators?

When I swith on the heating on the timer and set the thermastat the bolier does fire light up as if it is on, I can here the click and the pump going but no steam is coming out outside and the radiators are not heating up, can you help?
Leon, December 2009
depends on which glowworm it is?? does it have a pilot light or is it electronic ignition?? (i.e a fan??) how big is the terminal outside 5"diameter or large square steel box??

pete, December 2009