presure vessel problem?

[mrjibbs]

Hi
I have ideal classic 60 boiler in loft installed in 1996 (its been fine till now)

after 40 mins or so the presure in the system reaches its max 3 bar .it should be running at 1.5bar
when the system is not on and cools down , the presure then drops away and there is not enough presure in the system for the pump to restart.

would I be right in thinking this could be due to a problem with the presure vessel ?

I have bled all the rads ,there was a little air in one but the rest were fine and I have replaced the presure release valve.

there is no info on boiler, model number ect. so getting replacement presure vessel has been a problem, please help

 

[jackthom]

It's almost certainly the expansion vessel causing the problem.

If you're very lucky it might re-pressurise OK and it's worth a try if you have a foot pump.

FAQ7 explains how to do this better than I could.

//www.diynot.com/forums/viewtopic.php?p=251090#251090

 

[ChrisR]

See faq 31

 

[mrjibbs]

Thanks guys
pumped vessel up with cycle pump after draining off pressure.
no water escaped from the air valve on the vessel when i released some air so i think it might be ok.
The system is no working perfectly
thanks again for your help.

 

[hect]

Keep an eye on this mate - cos it could turn into EXP V pinholing

 

[mogget]

Also it's possible that the valve itself is leaking.