Where is the dirt finder sensor located? It appears to be dust particles stuck around sensor. The red light just flickers and never goes to green for any length of time.

model u6439-900 12 amp

cleaning performance 31.0

Debbie Grissom, August 2007

take the parts that come off and blow it with a air compressor out side it will clean it good all those bagless vacs are shop vacs ps : and dont suk up fine dust it will just blow it out any small gaps in the vac

ken, September 2007

Lot of times the sensor itself isn't bad or full of dirt, it's just moved away from where it should be. The rear of the vacuum body has a plate(plastic), that covers the tube that the hose goes into. Take the plate off and behind it is the sensor assembly which is the plastic tube itself with the sensor stuck in the bottom of it (2 wires). Push the small metal sensor up into the tube slightly with a screw driver. Reassemble. Switch the sensitivity in the front light panel to normal. This usually gets it working better. If not, don't worry about it. It doesn't affect motor operation or performance, and from what I've seen, isn't very accurate to begin with.
nicclean@verizon.net

www.vacuumcleanerhelp.com, August 2007