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As said before,confirm coil voltage and operating parameters. US site but here http://www.cpisurplus.com/Merchant2/merchant.mv?Screen=PROD&Store_Code=CS&Product_Code=O41A5-LC1-D6511&Category_Code=Telem+Cont

Let's clarify what you have. It's a new house so your colours should be: Cable one...............1 brown, 1 blue, 1 g/y sleeved cpc Cable two................2 browns and 1 g/y sleeved cpc. Confirm this layout first.

30 amp fuse, then 5amp fuse, with 15amp wire, then replace with the correct fuse and wire???? I'm a bit confused need more coffee. penny dropped... fuse carrier

Why dont you replace both the indoor and outdoor units, I assume you have them both.

programmable calculator perhaps. can you still get them. I used to have one made by Sinclair and as I remember it worked quite well. I prefer a notepad and pencil though. Good luck

I'd start with a value of 10k and see how it went. The ground connection just means it's a common connection and when it's all soldered together and a 3.5mm jack plug fitted and your screened cable soldered to the correct terminal in the plug it will be connected to chassis (ground, earth, 0v...

You need a dual gang log pot and a small enclosure, a soldering iron, solder, screened cable tools etc. Schematics on this page http://monitorcable.blogspot.com/ ignore the monitor cable bit