On Mon, 1 Apr 2019 15:51:27 -0700 (PDT), ItsJoanNotJoann
wrote:

On Monday, April 1, 2019 at 4:14:05 PM UTC-5, wrote:

I went through an assortment of high tech thermostats and now I have a
round Honeywell T-87. It works every time.

This thermostat is direct wired and no battery back up.

It still could be bad. The only way to tell is disconnect the "heat"
wire. (usually the white one) and plug the HVAC disconnect back in.
See if the outside unit is still running.
If it is just the inside fan that is running, try the green wire.
Yellow is for AC and the red is the 24v from the air handler.