I have already checked the power going into what I think is called the Duet (the box with the two fans) and nothing registers on the multimeter. When you say you don't need to open the Duet - the front is just a hinged door. The terminals I have checked are the two (Red/Black) in the green terminal box at the bottom just below the fuses
This query has been going on for some days now and is getting a tad frustrating. Any chance I could just ring you and do the checks in real time?? If you can ring me then 07921 350374 I would indeed be eternally grateful so I can get on with using the kit.
Allen