Thanks Lloyd, but I think I got it working properly. It's not a thermostat problem, it's the operator, me.
Checked a couple of videos and found out that the buttons do more than just turn on the Fan, Furnace and AC. To operate the furnace the Fan needs to be selected to Auto. Mine somehow was set on High, which when operating the furnace the AC fan will also come on at some point. Changed the Fan back to Auto and all works well.
They also suggested that when running the AC the Fan should be set to High. Too cool where we are at present to worry about that.
I don't have the manual for my thermostat so I'll try to download one.
2014 Sunset Trail Reserve ST25RB
2013 Toyota Tundra Crewmax Platinum 5.7 Tow Package