revans007

Thanks for that I will pass on to a plumber I know

Hi Alan, The council sent a heating guy who knew how to test the mixture of gases coming from the exhaust and had to adjust the mix of oxygen. He said it was off by quite a lot. You need someone who knows how to test it and adjust the air gas mixture.
Hope this helps.

Hi
I have the same boiler and am experiencing the exact same problem.Did you get it resolved?
If so I would be very keen to learn how

Thanks