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Glowworm 30cxi thumping/puffing?

Hi, I just moved into a house that has a fairly new glowworm 30cxi boiler. It works fine most of the time, but quite randomly when someone's having a shower, it'll start making a thumping / soft puffing noise and you can see the steam venting from the flue in soft puffs. When it starts doing this, the green led also starts flashing, but stays green. Any help would be great. P.S the pressure is a steady 1.0 - 1.1

Simon
November 2007
GlowwormGlowworm 30cxiHeating, Home Heating SystemsBoiler Heating Steam
sounds like your gas valve solenoid is breaking down. the green led indicates the boiler is lit. ring for manufactures visit it costs £210 including parts labour and vat u even get a 3 month guarantee on parts and labour phone number is 01773 828100

Daren the genius
December 2007

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Glowworm 30cxi Boiler: Thumping & Puffing Noise