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That’s similar to what’s happening it just bugs me that it’s doing something that should be impossible current shouldn’t be able to travel the wrong way through a diode unless the power from the grey is shorting through the mechanism of the valve somehow.

That can only happen if one of the Drayton panel relays and a thermostat is calling otherwise as I said the Grey wire is the only one live and the only possible electrical path is a residual current through the diode to the orange to the boiler

No it’s about 7 years old not been modified or anything recently.

I am going to replace the whole motor unit but just wondered if anyone has ever known the Grey wire to short through the valve unit to the Orange wire and cause a permanent live trigger to the boiler.

I would have to wait until the fault happens again,

Hi Everyone I have spent the last 2 days reading Diagrams and watching YouTube videos on Y plan systems and 3 port valves but I have not found any that have shown the problem I had which was that the Boiler got stuck on (pump running and heat circulation) making the hot water cylinder and rads...