Nest Y1 Problem
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Below are the steps to fix the nest thermostat fan not working: Firstly, restart your nest thermostat. Next, reset it to the factory. Now, turn the fan of your ac off.
Lastly, swap the wires at the terminal such that g wire into the y1 terminal and y1 wire into the g terminal. The nest showed the problem to be the y1 connection but actually it was the red power wire that was not making a good connection. We still showed a low battery but the system works. This should not happen now that the unit is getting proper power. A voltage of at least 3. 7v is required to install a software update. I'm having problems with my nest thermostat where it keeps saying my y1 wire needs checked and that it can't operate my equipment that additional wiring is needed. So i checked and even cut fresh wire just in case there wasn't good contact since the switching of thermostats. And when this problem occurs it keeps short cycling my ac. No power to y1 is an indication of a problem with the ac.