Hi again, Its a Baxi solo 2 It fires up and comes on fine. Its stays on for different periods of time at first. Could be on for a minute or two then its starts going out then ignighting and going out all the time. Pump is not broken and we had a new pcb fitted last year. Its an old model but reluctant to change the whole boiler as it fits snug in a cupboard. We do have a gas engineer but he is getting stumped!