Dina Klaas in

We thought our new a/c unit was freezing up (Reliance installed May 2018). Margaret, Reliance tech in our area arrived within the scheduled time frame and was quite quickly able to diagnose the problem, which was not a frozen unit. Our Nest had only been hooked up with 4 wires -- she said it has been shown that the 5th wire (the C wire) needed to be hooked up in order to run properly. System has been running fantastically even with these extreme temps! Thanks to Margaret!