To scatmanjohn.
Went to one today same problem,Hooting noise on a Vertical flue system..Fitted new gas valve (Part No.5000476) Adjusted fan speeds all now nice and quiet..Hope it helps
Tony the offset pressure on these is very hard to adjust even if you know what your doing, All new gas valves are factory pre-set so its easier to put a new one in instead of risking a RECALL. And you are right it is highly possible it is a weak air/gas mixture.
To scatmanjohn.
Went to one today same problem,Hooting noise on a Vertical flue system..Fitted new gas valve (Part No.5000476) Adjusted fan speeds all now nice and quiet..Hope it helps
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