On Monday, April 1, 2019 at 8:25:48 PM UTC-5, wrote:

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

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.

That is a job for either the AC/Heat man or an electrician. There is no inside
fan that I know of; could be but I'm not going to try to locate it. All I can
say is I've had trouble with this heat pump from the first day it was installed.
I might have gotten a lemon but it has not improved my opinion of Heil.