Intermittently the boiler stays on all night. The set point is 14 but the temp is 23. No flame showing on the wireless stat. and the new programmer timer is saying off at 3 in the morning but the boiler is blazing away. have to turn it off with the boiler stat.
Any ideas? Could it be the boiler which is under guarantee?

olepompey, April 2011

Thanks Brian. Will get someone to look at it but will be in a week's time. I'll let you know

Ole Pompey, April 2011

could be a motorised valve sticking open and not a boiler fault

Brian, April 2011