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Glowworm Spacesaver 40Br Mk 2?

When the main fire box fires up ie blown the mains electrical circiute
Bill R, October 2008
A little unusual for the boiler to do this most times it's the circ pump or motorised valve if fitted. some old units had a transformer to give 24v to the gas valve so it might be that

chris(ex heating engineer 30 years), November 2008
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