Hi can any one help
I have asked 2 plumbers up to now and both have had a look and never came back
The problem is this I have a vokera combi boiler that is about 6 years old and all was fine until about 12 months ago when I bled the radiators ready for winter. I then toped the pressure back to 1 bar as I believe this is what it should be. When I turned the heating on after about 10 minuets the pressure goes right up to 3 bar and starts leaking out of the overflow pipe which leaks out on to the work top. When it cools down the pressure then drops to around .2 to .5 bar and I have to top it up again. I have tried draining the whole system and re filling in case I had an air lock but the more thing I try the worse it gets.
Has any one got any ideas to what it wrong

Expansion Vessle on the boiler has gone. Needs replacing asap...

Expansion Vessle on the boiler has gone. Needs replacing asap...

correct, beat me to it.

Mog

Good plumbers on here, who can diagnose without seeing..........:thumb:

So where does that leave the two guys who've been to look?:(

Alcazar

So where does that leave the two guys who've been to look?:(

Dunno - but they ain't got a paddle ..... :D

Dave

ta for the advice the 2 plumbers have lost out on doing the job now they can go and swivle now. at least i know whats wrong now. the other thing is that when i run the shower if i put it on full it will run hot for a short while then suddenly go cold then back to hot. i have to run it on about 2/3 so it will stay constant. oh and if i press the valve on the vesil ater comes out i take it its not ment to do this. when i first bled the radiaters i notist that one of them was full of air so i tryed to refill the system and not bleed that one so as to act as a vesil but it still blows off every where

Hi again
Right I have solved the problem with the boiler reaching 3 bar I have drained the system again and closed all the radiators and refilled the system radiator by radiator and left one closed and unfilled which seems to have solved it.
But I carnt have a shower without the water suddenly going cold.
I have noticed when I run the hot water in the kitchen where the boiler is it will run fine for a few minuets then the boiler suddenly stops running and the water goes cold for a moment or two then fires back up and continues to do this hot cold hot cold which makes it impossible to have a shower
Has any one got any suggestions as to what is causing this?