Hi all, I have a glow worm 30 cxi, about 4 years old, the pressure dropped the other day below the cut off limit and the boiler cut out, this is because there is a slight drip on the safety discharge and over quite a period of time it eventually loses its pressure. anyway, after filling it back to just over 1 bar it started to go wrong, the pressure display started jumping all over the place from 1 bar to 2.5 bar and it sounds like the flu fan is having short bursts, it does this for a couple of minutes then works fine for 5 10 minutes then does the same? I have absolutely no idea what could be wrong with it and any help would be greatly appreciated, I wouldn't want a cowboy coming round trying to rip us off. This boiler is the absolute worst in the world, i though having a good name boiler would be brilliant but we've had about 4 internal leaks and now this! thanks steve.