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Mend Glow-worm Fuelsaver MK11 Boiler Room Stat

noise from glow worm fuelsaver mk11 boiler?

I have a glow worm fuelsaver mk11 and when the room stat and cylinder stat are satisfied and the valves close down i get a banging noise, i also have a back boiler plumbed into the same system that we use as an alternative (not both at same time) and this works ok without any noise, can you help?

Alan
October 2009

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