Hoover model 70930 vacuum. System check indicator stays red.

That suggests that there was a bad/loose connection in the cord that couldn't carry the needed current. It heated up and burned its way through the wire. Replace the cord, or if it was hot near the plug, cut it back and add a new plug, available at most hardware stores.

It could be a clog somewhere

Hi there! The vacuum may be still sensing dirt in the cleaner. Try wiping the area down in and around the bag port. Be sure you are replacing the bag with a genuine Hoover Type Q bag. Also, when assembling the bag remember to slide the red bag door lock to the right to lock it on. If the check bag indicator light still comes on there may be an issue with the sensor on the vacuum. We would recommend taking your vacuum in to a Hoover authorized service center for repair. Hope this helps! Service Center Locator

You likely have a hole in the hose causing a loss of suction/vacuum in the system. Mine cracked right around the bottom nozzle. There are no electrical wires in it, so I just taped it up with black electrical tape and it worked like new for many more years.

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.

the sensor is located in the tube that the bag mounts to, if you take the bag off of the unit and have an air compressor handy you can blow out the port hole this should dislodge the particulates that are causing the false reading, there is defintely a clog in the system. let me know if this helps thanks Don the Vacuum Doctor Alb, N.M.

Thankyou,

The redball indicates that it is full, that is due to the high resistence its suction system is inducing, because it is empty and it still stays up, I would try to turn the power settings a little lower, or it is experiencing high pressure from operation. Also, if you could adjust the bristles, or losen around the air vents. This should do the trick.
Thankyou, :)

It sounds like the plates inside the vacuum that detect the dirt have become dirty. I don't remember where they are, but I think they're accessible if you remove a certain hose. Again, I don't know which hose it is.

Try cleaning out all the pathways you can get to. Trapped particles can mess up this indicator. Particularly check the extra mesh filter that is under the bag (there's a plastic grid that snaps over it to hold it into place). Clean that out and make sure the bag is securely in place.

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