Nest No Power To Y1 Wire E80

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Hi, my nest thermostat says e80 error no power to y1pearl wilson: Nest learning thermostat loss of power = error e80. The main error i was getting was "no power to y1 wire. " i then lost internet connection to the nest because the nest internal battery was not charging and it's voltage went too low to maintain that connection. The nest learning thermostat needs 24 volts ac from the furnace unit.

Everything with the nest seemed great, until the cold weather hit, and now my nest is changing the temperature in my house in bizarre ways, mostly at night power to air conditioner seems fine make no mistake about it…there is no great deal of expertise in building a drive system for an electric bike disconnect power before wiring. No power to y1 wire detected. The ac is running though. Where in your home is your nest thermostat installed? How long has this been going on with your nest thermostat? What have you tried so far? Turning ac off for a minute Nest says c wire has no power (was working fine for months). If i disconnect c, it says no power to y1.