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Hayon
Community Member
since ‎11-19-2023
‎11-27-2023

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  • 2 Posts
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UK: swapping a Honeywell t40 to a nest thermostat pro edition

11-19-2023
Hi I currently have a honey well t40 thermostat in my hall way. I also have a invensys programmer. What is confusing me is the wiring. I currently have three wires in my thermostat and two wires (excluding the feed) in the 3 and 4 labelled HW and CH ...