Performed diagnostic on 2016 carrier system. Capacitor is a complete failure on compressor side. Installed a test capacitor to make your system cooling and it is. Nest thermostat is not charging. It is not holding on the wall. Even if this thermostat charges, it will not be a suitable thermostat moving forward. Will quote price to replace this thermostat. Can do a basic or an ecobee today. Nest will have to be ordered and installed at a later date. I tested today by tying red green and yellow together. Thermostat was not addressed today. Dual capacitor for main level system installed and system is cooling.