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The engineer was very doubtful that the gas valve was the problem, hence my use of the phrase "on spec". It seemed reasonable to seek advice of others as to whether this was a reasonable course of action. A few years ago a woman was admitted to our local hospital with carbon monoxide poisoning...

Addendum: The gsr engineer did suggest changing the gas modulating valve "on spec" at £180 plus vat excluding fitting. I am reluctant to go down this route without a firm diagnosis........

Thanks for reply Tony, Gas measurements considered normal apart from momentary drop to zero although Potterton engineer not bothered by this. The gas flame does not extinguish at all during this phenomenon, just drops to a low level then gradual increases accompanied by a whoosh and a bang. I do...

Hi Folks, Any chance of some advice? I have called out a gsr engineer and neither he nor Potterton have been able to help. The boiler is 8 years old and has worked well. Recently with CH on and the boiler is cycling it gives a loud Whooshing bang. It also does this when the HW tap is turned off...