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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...