Question about Hoover U6437-900 / U6439-900 Windtunnel Bagged Upright Vacuum

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Dirt finder I have a Hoover U6439-900.  After the cleaner was used a few times, the dirt finder light cycles between green and red on the regular setting and will not go to green.  On the sensitive setting, the red light stays on most of the time.  I have tried to run the cleaner to remove any dirt but have not solved the problem.

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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.

Posted on Jan 06, 2008

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Posted on Jan 02, 2017

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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.


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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.

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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.

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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

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Does this happen at both Dirt Finder Sensitivity settings?

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