So we bought the system a week or two ago, found out we needed a power connector, ordered it, just got it, and tried to set it up today. Did everything the instructions told us, and, even after several resets, I keep getting either an error E257, or that the C cable can't be detected. It turns our fans on just fine, but with no heat. It's not our heater, as that works just fine. We are wondering now if we did connect everything properly? Because now the air system comes on for 2 min, goes away for 2, and keeps repeating. Any suggestions?
Sorry to hear about the trouble you are having. I wanted to follow up and see if I could be of any help. Taking a closer look at the error code, I am showing that your heat pump is requiring a Y1 wire. Please let me know if you are still having any trouble from here, as I would be happy to take a closer look and assist you further.