noisey glow worm boiler

Joined
24 Nov 2011
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Location
Worcestershire
Country
United Kingdom
hi i have a glowworm combi boiler and it becomes noisey if i turn the appliance tepature gauge above 3 if i have it set on 3 or lower i dont hear a thing but above its very noisey any idea
 
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You dont say which boiler model!

It sounds as if the primary heat exchanger is lime scaled!

Tony
 

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