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baxpoti - Thanks for the advice. Do you reckon my expansion vessel is on its way out? I'm seriously considering joining the British Gas Scheme. They'll change it for me if it goes. I've had one problem after another with this boiler and I just know it ain't the end of it

Dunno if this might help. Copy and paste into your Web browser. http://www.baxi.co.uk/products/literature/Baxi-Combi-105HE.pdf

scatmanjohn. Looks like we've got a result! Pressure built up slowly to 1.9 Bar and settled there. Job done touch wood. Cheers my man, you're a star. TBH. I've had so much trouble with this Boiler that I'm tempted to bite the bullet and replace it even though its only 4 years old...

scatman - ignore this bit. I double checked and the fill loop valve was passing water very slightly. Must have happened when I repressurised. I'm a numpty I know. It is as was, pressure is rising on CH only. OK. I've disconnected the fill loop just be sure, reduced the pressure to 1 Bar and...

When I first connected my pump air rushed out, no water Yes I opened the PRV valve (a red collar under the boiler) and the pressure dropped to zero. I then pumped up the vessel, closed the PRV and opened the fill loop to repressurise. It looks like the pressure is rising now (albeit...

Done that scatman. It was easy as you said but unfortunately it hasn't worked. Pressure still rising when CH on

Forgive my ignorance but how do I open the PRV? Also. I have a foot pump but the guage may not be accurate. Is this 1 Bar critical or just a minimum, can I overinflate?

Morning scatman. Turned the boiler control to "off" position and left overnight. Pressure did not rise. In fact it dropped slightly. This morning. Turned control to DHW only, used hot water, everything ok. Only thing I noticed was that when I closed the hot water tap the DHW neon flashed...

Disconnected the filling loop and the problem is still there. It now appears though that the pressure creeps up a lot quicker when I turn the manual control to demand central heating. If I turn it to DHW only it doesn't creep up or creeps up that slowly that you cant notice (maybe need to...

Thanks scatman I'll give that a bash. Heat Exchanger - thats sound like an arm and a leg then.

Over the last few days my boiler, which I've had for 4 years now, has developed the latest in a long list of faults. CH and DHW both seem to be working ok but the pressure is up to 3 bars and the Relief Valve operates constantly. If I drain it down to 1 Bar it creeps back up and overflows...