Electrolux Model 2100 vacuum won't work

Assuming you mean a genuine Aerus Electrolux canister vacuum, the "full bag" light comes on when the bag needs changed. If that doesn't work, the gauge on the top needs removed and serviced or replaced. Hope that helps! Thanks!

try this
Electrolux LE, 2100 Hi Tech Canister

ok, you need to bypass the auto shut of. Put the vac on it's side and pull off the sliders on both sides.Carefully pull machine apart.lift the front of the piece that hold you bag.Underneathe there is a clear tube plugged in to a round thing on switch area.Simply pull the tube out of the rouind trhing.This will allow you to fillthe bag without shut dow.Just make sure your bag doesn't get too full....Chris

If the bag full light keeps coming on, you can first try adjusting the dial on top of the vacuum cleaner. If that does not work, then you need to change the control valve. This is an internal component of the canister and is directly below the dial. You will need to follow the instructions on a previous post to open the Electrolux plastic canister vacuum, and remove the bage cage. Once you remove the bage cage you can change the control valve, and this will solve your problem with the bag full indicator.

The bag might not be seated properly or you are using the wrong type bag.Try reseating the bag.

This is exactly the symptom you would expect from a defective bag control valve. The actual control valve sits under the dial on top of the vac and often cracks internally. It can be replaced in about 15 minutes by a good tech with genuine parts from AERUS Elctrolux dealer or repair center.
You can open the vac front to rear like a **** shell by sliding the bumpers out the front with the bag door open, however you must be careful not to disturb the wiring harness and to mark wiring locations. The body must be carefully realigned for closure. If it is not perfect you will not be able to slide the bumpers back in.

Check to be certain the thermo lite is on and not the bag full indicator. The thermo detector is very reliable, but the bag fill valve often fails. If it is the thermo, check your hose and wand for blockage by dropping a coin through them,before opening the vac itself.Otherwise you may have a bad set of motor bearings causing the motor to overheat due to its age.
The 2100 and all its canister cousins made since 1982 seem to be prone to failure of the dial valve on top cracking internally. The causes the bag full indicator to come on and the vac to shut down.
To open the vac you will need to slide the locking keys and bumpers forward with the bag door open. Do this with a set of pliers. Once done the vac will open from front to back like a **** shell. Be careful to look at the underside hinge are of the bag door before separating and mark and locate the wiring harness . This vac only goes back together one way, perfectly assembled it pops together with ease. If any piece is out of line it`s like a RUBIKS Cube. Take your time . OEM parts are only available through an AERUS Elctrolux dealer or repair shop

Try dialing the control valve to the mid way position. If the unit still shuts down with the bag full light on you have a damaged control valve under the dial on the top of the vac.
This valve failure is common in this model and can only be repaired by someone with original AERUS Electrolux repair parts, generally at an AERUS repair shop.

The filter for your Electrolux 2100 is located on the rear top of the machine. It is covered by a plastic grill. You simply place your finger in the rear of the plastic grill, push the tab in slightly and lift the grill up to expose the filter. The filter is approximately 4" by 6". It is NOT washable. Most Vac Shops sell replacement filters in addition to them being available at the local Electrolux distributor.

On my 6500, I just disconnected the air line from the switch and now the vaccuum won't sense the bag pressure; I just have to check the bag myself now.