New House - Can't switch central heating off!

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Well, that's not entirely true, I can if I switch everything off!

System - as far as I can tell
- Danfoss CP15C controller
- Danfoss WB12 wiring thingy
- Danfoss T45? valve?
- Danfoss Thermostat
- Grundfos Selectric pump
- HRM Wallstar oil-fired boiler

Stuff that works
- When I just switch the CH on at controller it comes on fine in conjunction with thermostat

Stuff that doesn't work
- When I switch on just the HW at controller, CH comes on too, regardless of thermostat setting.

I can find no way of having just the Hot Water come on by itself.

Any help would be very much appreciated.
 
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Thanks, will check out the valve. Can it be un-seized or will it need replacing?

Also, should the CH pump be coming on (it is at the mo)? Or is that somehow related to the seized valve?
 
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You will probably need to replace the motorized valve

As for the pump running, Is your system calling for Hot Water?
 
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The pump runs when only the Hot Water is switched on at the controller - no actual taps etc. are on anywhere.

Also... on furthur inspection it is a Danfoss HSA3 actuator
 

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