baxi 105e boiler gone off due to low pressure fault?

u need to check the expansion vessell has not deflated

russell
November 2009

I have the same problem, if I pressurize the system to 1bar and leave over night its still on 1bar, if i put the heating on it rises to 3bar and in the morning no pressure, any advice.

Cheers

Taza
October 2008

the problem could be that the expansion vessel has lost its air charge, the indication is that when the heating is on the pressure rises to 3 bar then water is disscharged from the pressure relief to outside. Top your system up to 1 bar using the filling loop then turn the heating on and watch the pressure gauge if it rises to 3 barish then it is a safe bet that it is the expansion vessel.

gasman.152
October 2008

Hi Jamie
It sounds like you have a leak somewhere on your system and that the boiler is losing pressure. As a short term fix if the filling loop is still connected you could top up the system. If it is cold only top it up to one bar. Look around you raidiators to see if there is any rust showing. This may indicate a leak. If nothing then try a leak stopping flued from any good plumbers merchant. You may need to get a plumber to get it in to your system.

Tony
April 2006