radiator boiler must be clogged/ is dripping a lot. How do I unclogg?How do I know if it is expan ves or PRV?
depends on what kind of boiler you have. Is it a combi boiler, do you have a hot water cylinder in the house?. Does it drip when the system is cold or when it is heating up. If it drips all the time even when cold and the filling loop is still connected it is most likely the PRV. Disconnect the flexible connection between the incoming cold main and the heating circuit under the boiler (filling loop). This connection sould be disconnected all the time, note the pressure on the gauge it should be about1.5bar when cold, if it is higher than this you will need to reduce the pressure by operating the presure release valve (I presume that is where it is driping just now). Turn on the boiler and watch the gauge, if it rises up to about 3bar and starts to drip. Then it is the expansion vessel, it may need toped up or less likely replaced.
