Hi Ron,
If you have a Comfort Control thermostat you may try performing a Reset on the Thermostat. This will erase all previous settings and reload the factory default settings and recognize all systems attached to it: IE air conditioners, heat pump, furnace, ect. To perform the reset: 1- turn the thermostat off. 2- depress mode and fan buttons and hold them down while you slide the bottom switch to the "on position". If the display says "FF" all is good. If the display says "EE" that means you have an error. The error could be the thermostat, wiring to the t-stat or the pc board in the front air conditioner.
Hope this helps, Fred