We have just had an additional radiator fitted to our central heating system. Each day the pressure has dropped, when topped up the system works fine. We have checked for leaks round the new radiator, nothing found. The system has worked fine until now,
ANY ADVICE WOULD BE HELPFUL

VinnyVegas, February 2011

Try checking ALL joints to the radiator from the point it was teed into the system.

A possible alternative to a leak could be an expansion vessel problem, the extra litreage added by the new radiator could be enough to push a failing vessel to the point where it fails.

Turn on your heating, as it warms up, check the pressure guage on the boiler, it it rises close to, or up past the red section, it could be be the expansion vessel discharging water through the pressure relief valve, giving the same effect as having a leak.

Carefree, February 2011

how did you drain the heating to fit new rad,look at the drain cock or werever you let the water out for leeks, you only need a drip to loos presure over night. hope this helps.

keith, February 2011