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Fingers crossed that has sorted it. Very grateful Terry for your help .didn't have a clue otherwise, looking good so far as the fluctuation of pressure from cold to hot is around .2 bar .Before was around 1.5 bar causing the prv to kick in. Just waiting for cool down and hopefully pressure will...

Ok. I'll try again, I noticed now that the pressure has returned to zero after draining water off that air has come out of the auto air valve and the pressure in the ev is back to zero, I take it that that will sort itself out and air will stop escaping when I re inflate the ev with a drain cock...

Ah ok I think I have this straight in my head now, basically there is too much water in the system as I understand it, So I need to drain water off to allow the water pressure guage to return to 0 then check the ev air pressure again to make sure it remains at around 15 psi or .8 bar

Not that I noticed and it was done over 3 years ago. I have reduced the boiler pressure to 0 and started to reinflate the expansion vessel, looking at the boiler gauge this has now risen to 0.5 bar, does this mean air is getting across to the water side and the ev is dead?

Since we moved in we have converted the garage and added 2 rads in there, this was done by a builder who used a heating engineer to add the rads, I imagine they would have mentioned something had it have been an issue adding the two rads to the boiler

Ok thanks I will give this a try, regarding the ev, my boiler is a Worcester 25si with an 8 liter ev inside, I have 12 rads including a couple of very small radiators and a large towel rail, is it possible the ev on my system is already too small

Further update Pressure held overnight, I put heating on this morning and after it had warmed up checked the pressure which got to 3 bar from 1.3 bar prv worked as it should and pressure dropped back down. I think I am right in thinking this pointed towards an issue with the expansion vessel...

Loosened the cap back off, the air vented out and stopped, pressure now holding better, checked and bled all rads again, pressure is dropping slightly but have noticed that there is a constant drip outside from the prv, looks like it could be the prv in need of replacement after all which was...

Update IV tried flushing through the system and whilst increasing the pressure could hear a hissing from the top of the boiler, I located the screw cap on what turns out to be the auto air vent and tightened it and now the pressure holds. Reading other forums give conflicting advice regarding...

Ok thanks .I'll give that a go the in order to try and clean it. If not I'll sort the prv with a new one. I think they are only around £15 quid and I should be able to do that myself without getting a plumber out

I wasn't actually intending to drain the boiler, like I said the pressure was almost 4bar which I'm sure you will agree is quite high. After looking at other threads for advice on here I went with releasing pressure via the prv rather than via bleed valves as I thought it would be quicker and...

Hi I have a Worcester 25si boiler, after changing a rad yesterday and filling I noticed the pressure whilst the heating was on had risen to nearly 4 bar on the gauge, down to me over filling when cold, I opened the pressure release valve to release pressure and it dropped down to zero, now when...