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I drained the system to repair a dripping rad valve. When I refilled and turned system back on (HW/CH) the 3 amp fuse next to the boiler blew within about 5 seconds. This fuse also covers the circuit to the airing cupboard where the cylinder, pump and heating controls are, so everything stopped...

I wish to install TRVs on my radiators (except the 2 nearest to the room thermostats). The system dates from ca 1970. The caps on all the rads are identical at both ends and (square nut approx 7mm) but flimsy and broken and so I cannot turn rads on and off. More importantly, visually there is...

I have been searching for a "how to replace a motorised valve head" article on the web or an exploded diagram of a Honeywell valve and cannot find either one. Description of problem: The 3A fuse in the plug controlling the CH junction box (pump, boiler, motorised valves and HW tank...