Dirt sensor The dirt sensor on windtunnel supreme doesn't work anymore. It is a bagged windtunnel. The sensor remains red.

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.

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.

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

i had one i think you need to clean felter on it the one on side

The other possibility is there is a blockage in the foot. these models have dual channel air flow (windtunnel) and become blocked when not cleaned depending on use. under the roller there is a cavity that can be removed for cleaning. a hot motor can be caused by poor air flow.

I’m happy to assist further over the phone at https://www.6ya.com/expert/robert_b96ba3f038cf317c

You either have a problem with the sensor or the circuit board. Most times it is with the sensor. Take the hose off, look inside of the part that the hose hooks to, you will see a disc, it may be clogged with dirt, try cleaning it, if that doesn't work, then the sensor may be bad.

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.

No motor? No beater? No nuthin? Let me know and I'll guide you.

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.

On the back, take the hose off, inside the duct you can see a disc,(it is on the bottom of the duct) it may be filmed over with dirt, that is the sensor, clean it off then try again. If it still comes on, then it may be bad or you have a clog in the hose or the dirt inlet by the brush roll.