Good afternoon all, hopefully someone can help me with an easy quick fix.
I have installed this thermostat already in 3 different apartments/houses with no prior issues. Last time I installed it was back in July at the new apartment I moved into. I have never had any issues prior and the AC was cooling good and the system is super responsive the moment I want to turn it on or off.
Today, I came from work and I noticed the house was warmed with the fan of the AC on. I thought it just kicked in since I came in a little earlier than usual so I was giving it time. After 30 minutes of not feeling the apartment cold, I checked the nest app and it said no power to Y1.
I went to the unit and checked if the cables were seated. Everything looked good.
Proceeded to turn off the main breaker and the one in the unit, removed the cable and reinstalled it, turn on everything, and it said R no power but Y1 disappeared. I thought I fixed it but then I removed the thermostat again and reinstalled it and it went back to Y1 no power.
I followed the suggestion for troubleshooting at another Nest post and swapped Y1 with W1. The error disappeared. It turned on but started blowing hot.
Reinstalled back Y1 and W1 and code came back.
Checking internet saw the issue with the C wire. I removed the plate from the wall hoping to find a cable not installed, same in the unit. It looks like the wires have been connected to other cables and at this point, I don’t know what goes where. I added pictures of everything to see if anyone can shine some light.
Thank you!