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Check that the motorised valve is even attempting to switch off - if the motor or switch is faulty, swapping just the head is a lot simpler than swapping the whole valve
rhowe-
Checked that. The motorised valve is currently in the not open position - pulled back by the spring, hard to tell if it has moved all the way but most. When the timer/thermostat activates the motor runs, the valve moves and the switch gets pushed to trigger the boiler.
I think I just need one of these and a spanner or two: https://www.screwfix.com/p/honeywell-home-v4043h-2-port-motorised-valve-22mm-22mm-compression/31480
jellybaby
My central heating doesn't switch off properly if the hot water is on. The radiators will still get hot, unless the local TRV turns it off. I think it's might be crap in the motorised valve preventing it from closing fully. The valve head is turning as it should, motor is fine.
Should be easy to swap? Turn off. Drain system. Swap valve. Re-fill. Anything else I should be thinking about?