said by PSWired:Almost all residential thermostats have control over the refrigeration and air circulation functions separately. That's how the "fan on/auto" function works.
Yes they do, most have a system FAN ON manual override switch and all that does is supplies 24volts to terminal G continuously.
Typically terminals Y (compressor) and G (fan) are energized simultaneously on a cooling call, and the bug that must be happening with the firmware update is that terminal G is NOT being energized, therefore the blower will not run.