The water is heating only?, if you request HW & heating and ensure both cylinder stat & roomstat are calling for heat does it work and move to mid position and supply both?, if you request heating only is the roomstat calling for heat as well?
When I put it to water heating only then and turn it off then it will not heat water for the central heating when I demand that later. I then have to move the switch on the valve to enable the central heating. I very rarely demand both CH and HW together.
Drayton are usually ok imo, and should last. What I have noticed with Drayton valves (usually the ZA5 though) is the screw that holds the motor (from factory btw) isn’t screwed down enough, if this is ok, then you could just be unlucky, but as stated will be under warranty.
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