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Embedded dirt finder light stuck

\015 The embedded dirt finder light is stuck on red. The light stays lit even in areas that I know are clean. Is there a way to fix this or "reset' the system?I have the same problem with the red light staying on. I've replaced filters and cleaned all accessible areas. I believe older sensing methods used an infared light but I've been unable to find what type of technology Hoover is using. The schematics don't give any clues or replacement parts. \015

Answers :

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.
Http://www.cleanmachines.ca/2008/08/why-does-dirt-finder-light-on-my-hoover.html
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