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How to fix my boiler?

My Glow Worm Ultimate 80FF gas boiler did not switch on today. The fan switches on and the pilot light piezo is pulsing but the boiler does not fire up. (the central heating circulating pump switches on and the programmer indicator lights as normal)

Robin
April 2009
Heating, Home Heating SystemsBoiler Gas Switches

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Glow Worm Ultimate 80FF Boiler Not Firing - Fix