Recently I have started up my remeha avanta plus and it has started to bang once after 20 min from starting up and then another round about evening, I looked in there the other day and caught it when it banged and a flame shot out at me I have had a gas safe plumber check it out and he says...
any ideas lads,my boiler when lights goes with a small bang sometimes a bigger bang, you can feel the case move slightly.please any help would be greatfully recived thanks.