Great thanks, yes it is a Suprima 50.
I don't have a clue about boilers etc, will need to get someone out to take a look. Can put up with resetting it at the moment. Here it can be bit expensive if it is the PCB!
I've been reading some people's problems with their boiler's locking out. Mine has started doing this, when i reset it, it will light and stay lit for a while then locks out again, i'm guessing by reading some of the forums it's the PCB. Can anyone tell me if it is safe enough to keep...