Vacuum tubes can sometimes get clogged with 'dirt', condensation leftovers and other debris. Just take a few moments to check if suction is where it should be- this can fix your error code.
Error codes for furnaces differ per unit but should be identifiable as with tagged on unit.
Using a drill bit, we improved the suction enough on this furnace's vacuum tube to clear the error code.
As an HVAC tech, you'll run into a lot of situations where a quick and easy fix will take care of the entire call within 5 minutes at times. Those are the good days!
If you have any quick-fix stories you want to share, please leave it down in the comments below

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