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Discussion Starter · #1 ·
I put in NEST Thermostats about 2 years ago. The upstairs unit randomly looses power to the Red wire and then randomly gets power back.

Is that a circuit board thing?

Thanks in advance




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I think it's important to state if you have a common wire already or not. Is there a red C-wire hooked up?

I'm having this same issue but I do not have a common wire and it's more permanent than random, so I'm sorry I cannot help more. I might check to make sure the wiring is secure to rule that out.
 
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