I have an older (12yrs) Rheem heat/cool unit. The inducer motor cycles on and off when the temp is around 75 degrees on a cooling setting. The cooling temp is set to 78 degrees. I replaced the thermostat thinking this would remedy the problem. The problem stills presists. The furnace seems to be getting a signal for heat.

Possible bad circuit board, which is what sends the signal to the inducer motor