hehe just so your code for the limit switch.
Change your filters...
there is a sensor that goes into the airbox probably on the right side should have 2 wires going into it. there may be a little reset button to hit to reset it. your furnace can't breathe correctly. It is not getting enough airflow or it is over heating. You may also have a small rubber hose going to an airpot pull off the hose and us a little bit of wire like a paperclip and clear the rust that is blocking it inside the limit switch.
Should be one of those.
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