I have a 5 yr old Potterton combi boiler that developed a leak on a pipe at the bottom a few weeks ago and blew the circuit board. I got British gas to come in and fix it and the engineer replaced the board, fixed the leak and said everything should now be fine.
As it was warm, we didn't switch the central heating on for a few days, but did notice that the hot water was hotter than normal. When we did switch the heating on, steam was pouring out the top of the boiler within a few minutes.
Got BG back in today and the (different) engineer said that the heat exchanger is scaled up and will need replacing. He said this without actually looking at the heat exchanger, just the steam coming out of the top.
Now call me cynical, but this sounds a little odd. is it possible that the first engineer could have damaged a seal while doing the other work and we are now paying for his carelessness? The engineer is coming back tomorrow with the parts and I'm going to ask him to leave the old one so I can get it checked out. Has anyone else had a problem with BG engineers causing more problems than they fix?