The pressure switch senses a pressure change and closes a switch to signal the control board that the furnace has proper air flow.
Bryant furnace limit switch location.
Locate the white limit switch.
If the thermostat is in the cool position the furnace blower should be running.
If the draft inducer motor is defective it may be unable to close the pressure switch causing the ignition process to stall and the furnace to shut off after a few minutes.
It will be located at the top of the panel.
Depending on your furnace model the switch will be surrounded by a silver or white cover.
Some furnaces will have two or even three high limit switches wired in series and checking the temperature at different points in the furnace.
Example limit switch on amazon honeywell l4064b2236 combination fan and limit furnace control.
Things to check first.
Ensure that the blower motor in your furnace is running.
Remove the cover by lifting it upwards or pulling it off to reveal the body of the switch and two metal arms.