Quote Originally Posted by mjohnson2981 View Post
I've been without internet for a few days, but it is up and running now.

I stopped by this unit on my personal time just to do a quick check. I didn't have any meters, but was blowing warm inside and the condenser fan was off. I cycled the defrost test pin (in a/c mode) a few times and it went back to normal.

I came back with tools and meters two days later and a defrost board and could not for the life of me get it to duplicate the problem.

I tapped on the thermostat and defrost board, checked inside the air handler and could not find and issue. I thought maybe it was losing the reversing valve voltage, but it is a rheem.

Anyone ever have a defrost board fail during a/c mode and go into defrost mode?
Not often, but it does happen. The defrost stat is usually the cause.