when the heating is on the boiler normally runs at 1 bar pressure but now for some reason when the heating is on it is running at 2.5 bar pressure is there a problem?

mike, November 2010

I have a worcester boiler 24 green star and the condensation pipe froze up and the boiler stopped working. I have defrosted the boiler dryed out the in side and the boiler will not fire up

Derek, December 2010

sounds like the expansion vessel has either lost its pre-charge pressure, or the bladder in it has split (if latter, you'll need a new vessel sorry).

Take the dust cap off the vessel's schreider valve (similar to a car tyre cap/valve) and press the pin in gently. If you get air, fine. If you get water, the bladder is split.

CMac, December 2010