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Thankyou Kev for your prompt advice. I had the boiler serviced 10 months ago by a local trader. They replaced the circuit board...three way valve....Cylinder and boiler thermo....wired it up all wrong and nothing worked. I had an electrician sort it out in the end. Might as well have got...

Just slightly louder than normal....I wouldn't describe it as a bang. :shock:

Just recently my boiler has taken to not firing up when it is switched on. The piot flame is lit but not the burner. Sometimes it lights after a few minutes and sometimes not at all...leaves a smell of gas in the house. I have cleaned some debris from the burner but it has made no...