Hi, I have a Potterton Performa 28i combi boiler, I tried to turn the heating on the other day but it would ignite, Ive had hot water no problem but for some reason the heating will not turn on, when I try the heating light comes on for a couple of seconds then goes out again.
Any possible solutions

Adam, September 2012

Change macro switch ,see if pin push the macro if not change diaphragm rubber

ltd, September 2012