[cabmandone]

Edited because I somehow missed this! "So, I tried changing the filter. That didn't work. I ran it without the filter. That also didn't work. Then I ran the motor in "test mode" with the intake door completely open (pulling air from the room where the FAU is located - completely bypassing the intake and the filter). That worked! So, I assume there is a problem with my intake.
"

Make sure all of your return grilles have no obstructions and then make sure your supply vents are all open. IIRC, the MVP measures static pressure and adjusts the blower motor accordingly.