Hot water stuck ON

Well, I've swapped the suspect new actuator with my known working one from the CH. Now nearly all seems fine - the orange and brown wires to it are dead when the CH off and live when it's on, and the boiler only fires when required. However the pump is staying on regardless and I'm pretty sure it should go off when not required shouldn't it?

Also even weidrer I fitted the suspect new actuator to the CH circuit and the wiring on that seems ok (no orange wire stuck live).

So why is my pump stuck on now?

It's fixed! The pump does run after HW and CH off, but afte a few mins it stops. I guess it's intended to overrun for a while.

The problem must have been the actuator as you said.

Thanks for you help again.