My nest says no power at c.. tested voltage at thermostat base plate and
shows 24v. Reran wire, still 24vwith code 79. Bought another nest
thinking it was an issue with base... Still says no power. Please help.
I found the problem. Someone spliced the wires under my house and only
connected 4 wires and left my c wire snipped. I am sorry for any
inconveniences this has caused you, I reconnected wires and nest works
now. Thanks again, and sorry.