i have been having probs with the combi losing pressure and then going over 3bar when the central heating is on i have repaced the guage then it was suggested to repressurize the expansion vessel when it tried to do that it spat out hot water from the valve is that meant to happen im getting hacked of with this boiler and i live 5 miles from baxi go figure

phil haslem, December 2007

i have the same problem. i have had baxi look at it and an independent engineer. apparently, it is most likely to be a dysfunctional expansion vessel and it is not unusual for this to need to be replaced after a few years. the parts are under £100-ish (I am told), but the problem is that the boiler needs to be taken off the wall. that is a good few hours work. Baxi were hopeless and i would recommend you avoid them - a great deal of money for terrible service. their solution was to slave a replacement vessel and stick it on the wall nearby. a cheaper solution if the boiler is out of sight. mine is in a bathroom, so i didn't accept their solution.

worth looking into anything else that might need replacing and getting the whole thing serviced (diaphagms etc) wilst it is down. will save you money in the long run. good luck!

sam100, March 2008

The bladder in your expansion vessel has gone.You can replace it or fit a replacement somewhere else in the system,i.e. a cupboard.Don't forget,the vessel you replace it with must be the same capacity as the one you are taking out.
If you're unsure consult a professional.

George Anderson, December 2007