Dirt finder sensor stopped working (by 3 users)

The sensor is located inside where the hose hooks on the back of the vacuum. Unhook the hose, looking down the duct, the will see a disk near where it curves to go into the vac. Clean that out, if it still stays on, It is called the EDF duct/mic asm. part # 47823004. The cable for it routes thru to the circ. board that is by the light. The circ. board number is 46851031. Also make sure that you don't have a clog in the hose or the inlet by the brush motor.