hi everyone please can somebody help me i have a worcester 240 combi boiler the problem is when i run my hot water tap it heats up fine to an extent but when i turn it off the boiler keeps running but the flames have gone out i would get a plumber in but i had dick turpin in last year for a 50pence diaphram he was there 2 mins and i have still got the red marks on my arse where he pulled my pants down if anyone can help please!!!!!!!!!!!!!!!!!!!!!!!1