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Old 04-02-2015, 01:57 PM   #1
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Any Electricians Here?

So my genius painter took off my old thermostat while painting the walls and didn't label any of the wires. I was planning on installing a Nest anyway but I have 3 red wires and 1 black wire. I'm guessing that the black wire is the power wire but I'm not sure where the 3 red wires should go. From the manual (, I've gathered that one should go into W1 (Heating), one into Y1 (Cooling), and one should be G (Fan). Can I just plug one red wire into each of those or is there another way to test where they should go?

Thanks in advance!
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Old 04-03-2015, 04:14 PM   #2
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Go to your furnace and find out which wire is which. They will be connected to labelled ports on that side. You'll need a multimeter to find out what is what.
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