Electrolux Precision vacuum brushes stopped turning and a red light turned on

Check the belt and the end bearings are free by hand. (electric off plug out) if not free remove plate to access roller/brush, remove clear any obstruction (Hair/string/thread) replace and test. ensure you site belt back on to spindle and roller/brush correctly...

YELLO and RED mean danger - clogging, not brush turning, overheating, .... it is time to RESET -- turn it all off and let it sit for half hour - that is what the manual says, check the brush that is not clogged up and check the inlet to the hose and where the hose goes into the body from the head unit where the brush is - make sure those not clogged either. Turn it on, push the RESET button on left back side of head unit by the switch that changes height. The reset button is like a circuit breaker - stops unit when overheats, starts when reset. Yello is ERROR, and fix it before it turns red and stops all the way. Cheers!!!

try pushing the reset button..its a little red usually located on the right side of the nozzle cover..

if it is making a humming sound but not turning you belt is broken, if it is not check the reset switch (little res button) if that doesnt work check the connections between the cord of the powerhead and the wand, the wand and the hose, and the hose and the vacuum
give the hose itself a good look over sometimes the wires up by the grip break in the casing

Button on CARPET, lower the handle for use, turn on power and the brush turns. Handle up like for storage, brush does not turn. Bare floor button pushed, does not turn.

It could be that the brush motor just needs to be reset. You should find a button near the brushroll cleaner step lever.

There is a ball valve between the wand hose and the base hose. It can get stuck in the "base" mode, which won't then redirect suction to the wand hose. There is a spring under the cup that the open end of the hose rests in. When you release the wand from the holster with the one-touch quick release, that spring pushes the cup up and turns the ball valve to the wand setting.

1. Unplug the vacuum.
2. Using the one-touch quick release, remove the wand from the holster.
3. Verify that the wand "cup" is indeed in the higher position. Do this by pushing on the bottom of the cup with your finger. It should easily depress.
4. Remove the wand hose from the main unit using the quick disconnect feature. Put your fingers into the hole and feel to the right. You will feel the closed valve, verifying that it is stuck in "base" mode.
5. Using a screw driver, insert the tip at the TOP of this valve and gently pry it downward. This shouldn't take much force.
6. Reassemble the hose wand using the quick connect feature and reholster the wand.
7. Plug in the unit and verify that the base unit has suction.
8. Remove the wand from the holster and verify IT has suction.

The light with a cord "plug" on it indicates that there is power coming to the vacuum. This is normal.
Assuming that the vacuum works, but not the power nozzle, turn the PN over to view the brush. Clear all hair, thread, fibers, etc., that may be wrapped aroung the brush. Use a sharp knife or scissors to cut through them for ease of removal. Make sure the ends of the brush are cleared as well. Try the vacuum and press the reset switch on the PN. Does it work?
Is the PN motor running, but the brush isn't spinning. Turn PN over and try to spin the brush. If it turns freely, the belt is broken and needs replaced. This should be done by an authorized Aerus Electrolux service tech to avoid incorrect reassembly and resulting damage to vacuum and owner.
If the brush doesn't freely spin, but turns with resistance, this is normal.
If it still doesn't work, try the Sidekick mini power nozzle that should have come with it. If it works, but the full size PN doesn't, there's a problem with the PN. It needs to be taken to an authorized Aerus Electrolux store for diagnosis (free) and repair.
If the Sidekick doesn't work, the problem is in the hose, wands, or canister. It could be due to bad switches, wiring, and other electrical problems. In this case, the entire vacuum needs to be taken to an authorized Aerus Electrolux dealer for diagnosis and needed repairs.

http://www.aerushome.com/storelocator/

Does the power nozzle motor come on? Is it just that the brush won't turn? If it's just the brush not rotating, the belt probably broke and needs replaced.
Is the brush clean? If not, clean all threads, etc. off.
Check all wire connections for breaks, cracks, and discoloration. Power nozzle to wand, wand to wand, wand to hose. If any of those are found, that part, and probably the one it connects to. will need replaced.
Ensure all connections are snug.
Internal wiring, including connections, could be bad. This would include wiring in the power nozzle, wands, hose, or canister.
Reset or hose switch could be bad. These would need replaced.
Power nozzle motor could be bad. Generally the belt will break before the motor burns out, but it's possible it's didn't.
For any internal repairs, including belt replacement, the entire vacuum should be taken to an authorized Aerus Electrolux dealer. The service technician can also troubleshoot and find the problem. This is generally done at no charge.
You've got a great machine, and with proper care and maintenance it should last for years to come.