burner buffeting on common flue

[andyhalf]

Hi, new to the forum, I have a sherborne s70c which after running for a couple of minutes starts to buffet. I say buffet for want of a better term it sounds like a whooping noise. there a three of these on a common flue and when any two are running the third can do this but it is usually the one that is furthest away from the flue riser. All the combustion readings are good. so i am a bit stumped i wonder if it is a flue sizing issue or a heat exchanger flueway issue?

Andy

 

[Chalked]

Welcome Andy
you will need a few more posts, then contact a moderator with your gas safe details. This will get you into the gas safe forum. Repost you question there and it will be answered.
you will not get any answers that are gas related on an open forum.

 

[Dotty]

Sherborne? That sounds like a hamworthy boiler! In which case it's prolly comm too.

 

[Dotty]

Gross input 77.7 kw. Thought so.

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