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@stem I fiddled around and wasn't sure which terminal the brown wire should go. The boiler is upstairs with programmer / thermostat downstairs. Wasn't confident tracing wires and I don't own a multimeter. I kept looking back at the pics i took before I 'rewired' the danfoss and couldn't work...

Thanks a mill for this. I shall report back shortly

I'm really racking my brain here. Clearly my wiring and observation skills are some what to be desired! But atleast, with thanks to your help, we may have found the culprit! I took pics before i started fiddling around - lo and behold I can't see the journey of the brown wire from the drayton...

Sooo... Looks like a school boy error but the brown wire from the Drayton isn't connected! How on earth did i miss that! Now the question is where do i connect it too. Obviously after I switch the mains elecy off.

Ah yes the junction fuse box is what I was meaning - thanks for the correction, and thanks for the explanation. I'll get them checked and report back! Best, T

Hi Stem, Many thanks for your reply! Really uber helpful Now, the brown and blue wires... Do i need to open the Drayton to test the wires or do you mean the brown and blue wires coming out of the Drayton connected to the fuse box?

Hi Everyone, Very new here and made an account for some advice and guidance. Here's hoping you can help! I have a Worcester Greenstar 40cdi system boiler that is hard wired to a Danfoss FP715Si 2-Channel programmer for heating and hot water. The boiler has a Danfoss HPA2 actuator and a...