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Many thanks for your prompt reply. I assume, therefore, that the isolator valve (on the heating side of the double check valve unit) is faulty and that it is only the dc valve that's stopping water from coming out. Does this mean air could also get in?

I have recently had a leaking ball valve (fitted to the mains side of a closed system). As a temporary measure I connected up the flexible filling loop hoping it would at least stop water dripping out. Unfortunately, the pressure in the central heating system gradually started to rise even...

I have a 7 yr old sealed ch system and have recently replaced the Peglar TRVs with Drayton TRV4s. At least one TRV now makes a knocking sound as it opens. None of the radiators get cold and all appear to function correctly. I have repeatedly bled the system: the water seems to have air in it as...