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pressure overflow problems on Thermaclassic combi boiler,?

Hi, I have had the prv on my boiler replaced as the overflow pipe was dripping and the pressure dropped to 0.0 when the heating switched off. This hasn't solved the problem

I have noticed recently that the overflow is still dripping (at quite a rate sometimes) but when the heating swtiched off and the pressure dropped to 0.0, I topped up the pressure to 1.0 and left everything but when I returned 2 hours later the pressure was up to 2.6.
Ashleigh, March 2008
It sound like the expansion vessel need recharging or replacing.
do you have the manual for your boiler, if so it will explain how this is done.

gary.wright53@googlemail.com, March 2008