Central Heating hot water and radiators on together

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Central heating hot water and radiators on together
I have Glow Worm 80ff, Danfoss programmer CP715, Danfoss H series switching valve.
The radiator system works OK, but I notice that after a bath when the hot water system comes on the Danfoss valve goes to the middle position quite often (not always but usually) so that the radiators also come on and stays in that position even if I switch the radiators off at the CP715.
Is it the CP715 programmer faulty?
 
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Its a faulty valve, you will find that it will return to hot water only if you remove power from it, but it is not responding to the wire from central heating telling it to go to hot only.
 

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