i have a glow/worm 24ci boiler,its been working well for 5 years.
it started losing pressure from the pressure release valve,i had a new valve fitted but still have the same problem.

would be very grateful for any ideas on this.

mr s miller, March 2008

The pressure release valve only blows off at or above 3bar pressure.

Check what is your pressure when system is totally cold (should be 1 - 1.5 bar) if it is above this bleed some water from
one of your radiators until at 1 bar, then all should be fine.

If it already reads 1 - 1.5 bar, but when heating system is on rises to above 3 bar then the expansion vessel in you system may either need recharging or replacing.

T, March 2008

If you're constantly seeing water dripping form the pr pipe then it could be-
faulty pr valve

filling loop passing allowing water into system until it reaches 3bar+ and leaking from pr.

faulty h/ex allowing same prob as above.

if you see water dripping when the heating is on then could be expansion vessel.
this prob would be like:
boiler cold-pressure guage 1 bar-no water from pr

boiler hot (heating on a while) pressure guage 3bar+-water from pr

cold again-1 bar or less and requiring top up.

ideally boiler would be 1 bar cold and rise to 2---2.5 max when heating on.

iain, March 2008