Question about Hoover U8171-900 / U8172-900 / U8173-900 / U8174-900 Savvy Bagless Upright Vacuum

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Hoover Savvy The red light for the dirt finder is on when pushing forward and the green light is on when pulling it back. This happens all the time. It's like the dirt finder sensor isn't working right. It seems to be picking up good and we keep the filter clean.

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Re: Hoover Savvy

Does this happen at both Dirt Finder Sensitivity settings?

Posted on Sep 16, 2007

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The dirt sensor light stays green. It won't turn red, even when I know I'm picking up a lot of dirt.

The Board(46851083) is No Longer Available
The EDF Duct (47823004) EDF= Electric Dirt Finder is $20.40 from
http www searspartsdirect com model part u6485900 0517 0645000 50039309...
You can test the board by crossing the 2 connectors to "close" the circuit for the mic (small black and blue wire) while vac is running and light should go to red every time you complete the circuit. WARNING: There will be exposed electrical points on board that could cause an electrical shock!!! or damage to board if not just crossing mic connections.

Jan 22, 2016 | Hoover U6485900 Bagged Upright Vacuum

2 Answers

Hoover - Red Light Dirt Sensor

check to make sure the settings didn't get inadvertently switched to the hi position, move the switch back and forth from high to reg a few times, then leave it on reg.

remove and hand wash the primary filter and secondary filter, dry throughly and replace them in the vacuum.

if none of this works, you will need to have the vacuum serviced, or if it is still working, just don't pay attention to the dirt-finder. the dirt sensor on your vacuum is located in the suction tube and is generally not accessible enough to clean without taking the vacuum apart.

hope this helps,

Nov 20, 2007 | Vacuums

1 Answer

Embedded light sensor stays red all the time

The back cover is called the a micro/dust assembly. See #21 here:

The little sensor should be in the round recess in the top of that assembly. When you are putting the cover back on you have to use a pair of needle nose pliers to push the sensor into the round recess until it is snug. It is hard to do because the wires to the sensor are very short and you have to be careful not to break the wires on the sensor. The sensor is a little microphone that senses the noise of the dirt going through the EDF. The first time I did mine I didn't push it in hard enough and came out of the EDF recess and fell inside the vacuum body.

Jun 14, 2010 | Hoover U6630-900 WindTunnel Bagless...

1 Answer

Hoover windtunnel dirt finder light stays red. We've cleaned the elbow the roller the hose and have a clean bag. The vacuum is new only had it for 3 months.

I'm not sure about a 3 month old vac, I'd probably go the warranty route. However, for the older vacs thy start getting false positives. The sensor is simply a microphone hooked to a computer chip detecting sounds of dirt entering the bag.
To rig it to start working, you'll need to remove the tool accessory tray and elbow that enters the back of the vac, and attached to the bag. This will reveal the microphone at the elbow, and wire that runs into the bottom area of the vac. When on, a large amount of air comes from the bottom screw and area where the wires enter. My fix was to clean up the microphone contact points a little bit with a screwdriver, and then leave the vac running while putting in dampering in the hole at the bottom, and around the back of the elbow. Cotton balls and electrical tape at the bottom hole, and napkins around the outside of the elbow (wedged between the back of the vac assembly and elbow did the trick). The schematic for the vac is here: http<colon>//www<dot>vacsrus<dot>com/CartGenie/pg_U6485900<dot>asp
Look for micrphone.

May 12, 2010 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

My Hoover Dirt Finder red light stays on. All

Inspection of the circuit board found that the 470uF capacitor looked damaged. I replaced it and I now have the Green and Red lights are working correctly.

Jan 19, 2010 | Hoover U6476-910 WindTunnel Upright Vacuum...

1 Answer

My dirt finder light is not working My dirt finder red light never goes off. Have changed the bag, cleaned all filters.

take the bag out and the filter,put the coveer back on and start it up.see what the light says.if there is a clog somewhere and air is not getting into the bag it will read full.if that workd then put the filter back in and start it up.when the bag is in and hooked up does it expand when you turn it on.try putting the bag in and no cover and see what the bag does.please leave feedback

May 05, 2009 | Hoover U6437-900 / U6439-900 Windtunnel...

3 Answers

Dirt finder sensor stopped working

I had the same problem with a hoover windtunnel 6200 - u5477-900. I removed the flexible hose from top of the plastic tube running vertically along the right side of the back of the vacuum. When I used a flashlight to look into the plastic tube, I could see a clog at the bottom, where the flexible hose curved frontwards towards the brushes. I then removed the 2 screws holding the vertical plastic tube to the vacuum. When I disconnected the plastic tube from the flexible hose at the bottom, I found a clog of dirt and dog hair. After removing the clog and reassembling, the clean / dirty light now moves back and forth from red to green.

Jan 29, 2008 | Hoover U6437-900 / U6439-900 Windtunnel...

4 Answers

Embedded dirt finder light stuck

The Hoover uses a small microphone that is positioned in the plastic housing that the end of the hose fits into, just behind the bag compartment. What happens is that when dirt comes up the hose and hits the 90 degree corner, just before it enters the bag, the microphone picks up the sound and transmits that info to the electonics that controls the lights. Sometimes the microphone will stick and the red light will stay lit. If you take a screwdriver and give the microphone area a sharp tap with the handle of the screwdriver, this will often jar the microphone and it will begin working again. If not, it may need to be replaced. NOTE: this function does not affect the cleaning efficiency of the vacuum. Your vacuum will still work normally whether the dirt sensor is working or not. It is a totally unrelated function to the vacuum itself.

Dec 31, 2007 | Vacuums

1 Answer

Dirt finder

The sensor may be bad, or it may be coated over with dirt. Re,ove the hose at the back of the vacuum, the head of the sensor is down inside that opening, reach in there and clean it off and see it that corrects the problem, if not replace the sensor.

Oct 16, 2007 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Embeded Dirt Finder

check out the switch that activates it. go to thehooverstore for a complete listing of hoover machines. I'm sure you'll find your machine listed along with an exploded diagram of the machine

Sep 19, 2007 | Hoover U6437-900 / U6439-900 Windtunnel...

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