@Fialam11 , if you are getting a Y1 error, the Nest Thermostat cannot see the HVAC control system. You have a bad conductor wire or it is not properly inserted into the Nest Baseplate.
AC Cooling Wizard
NestPro, Google Pro, Mechanical Engineer and HVAC service company owner. If my answer solved your problem, click Recommend this Answer below, and If it helped you, please give a Kudo.
