I just thought I'd run this by and see if anyone might have any guesses as to what would cause an A/C unit to blow cold air for several hours and then warm air (80º-86º depending on the time of year)? Scenario: Thermostat set to 75º. Inside temperature is maintained at that temperature for 8 to 12 hours. After that time period, the blower fan continues to constantly run but inside room temperature reaches up to 86º. I turn the thermostat off, go to work (10 hours), come back home, turn the A/C unit on and the temperature goes back down to 75º. This same scenario repeats on a daily basis.

Hi. I've been having a pretty bad day today and it got even worse. I wanted to replace my old thermostat for a Nest smart thermostat. I switched the breakers off, removed the old thermostat and installed the new one. I received an error "Error E195: No power to R wire detected". Than I removed the new thermostat and reinstalled the old one, unfortunately it was not working as well. I tried to twist red and white wires together to see if the AC unit turns on but it did not. I have no idea what to do and I dont want to call a technician just yet, maybe its an easy fix. My AC system is Trane. The outdoor unit model is XE1100 and the indoor air handler model number is TWE036C140F1. The wires that I have are Yellow, Orange, Red, White, Green, Blue, Brown, Black.Brown and black wires were taped and not connected to anything. I attached pictures of the wire that connects to thermostat. It is showing no power with a non contact voltage tester on either side. Also attached pictures of how the old thermostat was connected and how I connected the new one. Below is a video showing the circuit and voltage tester. [url]https://youtu.be/H1rSvcTaSVs[/url] I would really appreciate if someone could help me. Thank you [attach]109664[/attach] [attach]109665[/attach] [attach]109666[/attach] [attach]109667[/attach]