My boiler keeps coming on & going off , flame light is coming on and boiler runs for approx 30 seconds then goes off for approx 20 seconds, this continues ongoing thus system takes ages to warm up . Pump running ok.
The hot water system seems to operate ok.
Any ideas what to look at/change?

john, November 2007

Hi Without being there to look at the problem, it may sound like you have an intermittent fault on your PCB, good idea to get someone to have a look or check the pcb for dry joints, this maybe the problem but like i say without being there to take a look, it could be something else,
Goodluck

Jonno, November 2007