hi, my boiler is losing pressure.
re: how do i fix my boiler?
look at the pipe work around the boiler - you should see a tap(s) kind of like the ones that connect to your washing machine. turn them both and watch the dial on the boiler - fill it up to 1.5 bar from cold then turn the central heating on.
i'm not sure if you have already done this and it is losing pressure rapidly or if it has just lost pressure over a long period of time - they do this and it is important to keep the boiler pressure topped up to over 1 bar as the pump 