It's wired exactly like the picture in the instructions showed for
installation. Tech was the one that said it was the thermostat. Tech was
the one that jumped it to only run in cool mode for now.
Mine worked fine for over 2 years but this weekend the same thing.
Technician put in a jumper for now so it will only stay in cooling mode.
Must be a software update or something.
I had the same issue with mine. it started Saturday. it would not switch
my heat pump over to cool. I showed cool on the thermostat but not at
the HP. I'm wondering if there was some kind of screwy update. we had to
put a jumper in to switch the mode...