Hello, I have a baxi combi boiler 105e and the pressure was completly off the scale well over 4bar. I released water from bleeding the rads and got it down to around 1 bar. After turning system back on after a few minutes the pressure went straight back up to full again!!! So I tried again and this time took enough water from rads to get the pressure to read 0bar (ha ha i thought to my boiler! got you this time) But no :0( episode 4 revenge of the baxi ! it went straight back round to full? when it is powered on the overflow outside is spewing hot water??? Please help can't afford a plumber this close to christmas and it's getting cold!! Thanks Guys.

Matt, December 2007

I aggree with BAZ the bladder within the expansion vessel has split, it will need replacing, cost about £60 + labour. To check, vent the vessel by pressing in the valve on the charging point located on the top of boiler right at the back behind the flue( (it looks like a car tyre valve). Press the centre, if hot water spits out or any water for that matter the vessell is Knacked.

Fletch, December 2007

sounds like the expansion tank has had it

baz, December 2007