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It was the air flow sensor being rather sluggish in returning to it's "I'm ready to go state" when the fan stops.

Thanks TheGasMa26 I agree I wasn't convinced but it was a cheap and easy thing to eliminate. Sorry can you explain sticky aps and SL. The fan and PCB are about 2/3 years old so hopefully are ok. More than happy to test electronics/electrics do it all day.

Still got the problem, it all worked fine the first evening after changing the Thermostat. Looks like I'm entering getting someone in territory. As usual it all fired up fine at 6.50 am, by the time I'd go downstairs @ 7.20 the boiler had gone into fault mode. It only came on again as I walked...

Is the Thermostat not part of the control system and not part of any safety system. It's been an eye opener listening to this and made me think about what I'm doing so thanks.

How is it room sealed ? It's a metal case hanging on a back plate. Installed it many years ago, this will be my second full central heating installation. It's been inspected and no complaints. I would happily install another boiler but regs say I cannot.

Thanks, replaced tonight and it's working great, house is warm again. Takes longer to get the case on. 8)

Thanks for your reply but why should it be done by a gas reg person ?

Hi I've noticed that my central heating system is coming on ok, heating up the pipe/rads/hot water etc but then after about 20 mins the circulating water is not so hot. After about another 10-20 mins the boiler fires up again and raises the water temp. This cycle continues. As far as I can...