DaMeister
Nov 1, 2011, 05:55 PM
So I just bought a older home with an old sliding honeywell thermostat and I want to install a programmable 3M30. I only have the black & white wire in the wall and the instructions talk about all these different wires. I only have the black & white - not sure what to do? What do I do? Does this thermostat work with just two wires or do I need to buy another one?