Only get central heating if hot water turned off (Ed.)

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Cannot say definitely but sounds as if the actuator is buggered which unfortunately for you may mean major plumbing work to replace, I just replaced mine which fortunately was a Drayton 3 port valve which meant I could just simply replace by removing the complete actuator box off the valve by pressing a clip and rewire a new one in. Yours may be the same, try unclipping it off the valve.

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Just to give you a better understanding of how it all works I found this quite useful, if you have a neon screw driver or multi meter and are comfortable working with electrics you could check whether you are getting the necessary feeds to the actuator wires at the junction box when calling for hot water or heat etc Good luck
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I’ll see how it gets on with the white wire being connected to the correct terminal. If still no luck then I’ll move my attention to the 3 port valve. I’ve watched some videos on YouTube and it seems relatively straight forward to replace.

Thanks everyone for the advice and info, I’ll give these videos a good watch to get my head round it all
 

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