I reacently repaired a small leak just below radiator valve in an upstairs bedroom. Since the repair the boiler keeps starting and stopping. It manages to flame up but then after approximately 10secs switches itself off again. Whilst boiler starts up there is slight tapping/knocking on pipes around repaired radiator.
Would anyone be good enough to shed some possible light on the problem.
Cheers.

paul, December 2006

bleed it, you'll probably notice thye pressure guage goin mental when you run it?

dn, January 2007