There is an icon on top that has a question mark that is lighted. I have changed bag. Will not start.

The light on the top of the 7000 that represents a "key" as you state it, is actually a "No Bag" light. That means to check the bag compartment for a bag. Replace if you do not see one. Close the door, push the start button, and voila....it will start. If it doesn't , make sure the bag top (cardboard) is flush inside. It may be missing the bag switch. Hope that helps!

The electricity light means there is powewr to the vacuum.The ? means there is not bag or the vacuum doesn't detect a bag.If so there is a little swich that is pushed down when closing the front cover.Make sure it goes down when closing.It is located where the top of the carboard of the bag top...Chris

Symbols..Question mark means "Put a bag in me", checkered light means : "Change me, I'm dirty"....pre-lit power light means: "You have Powaaa" to the unit and the thermostat light means the motor is too hot if it comes on, (most likely from a hose clog) and needs to cool down before the motor will run again. The settings on the control valve basically have to do with the auto shutoff when the bag needs changed. The lower the valve is turned, the more full the bag will get until it shuts off. Hope that helps!

This light indicates the bag needs changed. If you've done that, The possibilities are a clogged hose, clogged elbow at power nozzle, or on certain models a bad Control Valve Assembly. If yours has a dial on top, turn so the smallest dot lines up with the arrow. If it doesn't have a dial, you don't have to worry about a bad CVA. If you aren't using genuine Electrolux bags made by Home Solutions, then the bags pores will clog faster, which would cause the vacuum to shut off.

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.

make sure you have bags or you need to check if the motor or anything is clogged or needs fixing

Turn the knob on the top of the vacuum all the way to the right and try it again

Make sure the bag is in place correctly. The question mark light indicates that there isn't a bag in the machine. There is a small button in the front of the bag housing that is depressed by the cardboard top of the bag. I think it is located in the bottom right hand of the bag housing if you are facing the front of the machine. Make sure the bag is depressing this actuator when the front of the machine is closed. If it is, it may be an internal problem with the switch. Good Luck!!

According to the manual, the machine doesn't "think" there is a bag. If you open it up and remove the bag, there should be a small button in the lower right hand corner where the cardboard top of the bag rests. Depressing this button should make the "?" light go out, and the machine run if it's in the on position. Return the bag to the unit and make sure the bag is depressing this switch when you close the door. Good Luck!!

Slide the plastic piece off the cloth bag and open the top. Looking down into the cloth bag, you will see the old bag. It is secured to the machine near the top. You will find the cardboard collar about a third of the way down. Remove it carefull. Now, stand BEHIND the machine and put your knee against the back of the handle and taking the new bag, open the hole in the cardboard collar and insert the bag into the cloth bag and put the cardboard collar onto the handle fitting. It helps to put the lower part of the hole on first and then press the top of the collar onto the handle fitting. The idea of standing behind with your knee against the handle is so that as you attach the bag, you will be pushing against your knee which will steady the machine and allow you to use the required force to complete the action. Once completed, fold the top of the paper bag down, so that when you replace the top slider, the paper bag is NOT clamped between the cloth bag and the slider.