I have a potterton perfoma 28i boiler.when ever the central heating comes on or the hot tapis run, the flame ignites till it gets to the next temp reading on the boiler. It then goes out but reignites a few seconds later. This means the hot water takes ages It never used to do this, what is the problem likely to

Dan, October 2011

May be blocked DHW heat exchanger

k, October 2011

this could dia fr rubber worn out or micro switch not giving connection you can get kid to change switch very common problem in this boiler

ltd, October 2011