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My central heating is not firing on automatic and whilst checking the actuator I have found an unconnected yellow wire in WB12. Everything works fine if I switch Actuator to manual but only hot water comes on when in automatic position. Actuator = Danfoss HSA3. I don't know how to post a wiring...

I'm having problems getting my CH to fire up. The system uses a Danfoss motorised paddle valve and will only fire up the CH when switched to manual. It will fire both CH and HW together or HW alone but not CH alone when in the automatic position. I can't keep it on manual since every time the HW...