Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater "battery identfy" Questions

I REPLACED BATTERIES ON MODEL # TH8320U1008 THERMOSTAT, AND AM WONDERING IF I NEED TO SOMEHOW RESET SOMETHING TO GET THE A/C UNIT TO TURN ON. I GET A CLICK SOUND AS IF THE AC WILL TURN ON, BUT IT ...