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blockage in the suction line
if it is the wet mode there should be a valve (ball) that sucks up to stop water from getting to the motor when the receiver is too full. If you are in wet mode and still have the dust bag in place then the bag will be a solid block of mud and that will be the blockage.
# 1 myou just take the bag out make sure ytou sponge filter is in place athe top and turn it on the power switch just turns on ,machine ther is no wet dry switch just an empty bagless cannister is all you need make sure the ball outlet in vacumn is working it stops water from overfilling cannister # 2 just use the proper bag and attachment to vacumn up the drywall dust a good building supply store has special sanding attachments for vacumn so you can sand and vacumn at the same time
I suspect there is a blockage somewhere along the pipes leading to the dust bag.
The bag full or bag change indicator measures how strong a vacuum is present at or near to the point where the bag is connected to the pipes. Under normal conditions an empty bag poses little resistance to the air passing through and therefore causes only a slight vacuum. A full bag poses a lot of resistance and therefore causes a strong vacuum which in turn makes the indicator show time to change.
If, however, there is a blockage somewhere, regardless of the state of the bag, a strong vacuum develops which causes the indicator to show as if the bag is full.
The hot smell is proably a result of the motor having to work hard trying to overcome the blockage.
Try to look into all the pipes - you may need to do a bit of dismantling and/or strech out flexible pipes to do so - to see if there's anything stuck. Also try some (careful and gentle !) poking through the pipes with something like an un-ravelled wire coat hanger, but take great care when poking through the flexible pipes as these can be ripped and then you'll have a differnt problem !
This vac is prone to a control valve failure with the exact symptoms you describe. There is a dial valve on top of the machine designed to regulate how full the bag will get. The valve which sits underneath the dial on the vac likely has a broken plunger and will need to be replaced. Take it to an AERUS Electrolux dealer / shop for an experienced tech to work on.
try opening it up again and reclosing. Might be as simple as the cleaner is not lined up right. Check for bag misalignment. some cleaners have a lock-out mechanism that prevents the cleaner from starting if the lid and or bag are not in the proper alignment. If it is the filter compartment, same thing. Then, check a different outlet, check if your bag is full. if you were cleaning with the machine already prior to the checking of the back, maybe there is a clog or full bag as this would cause the vac to overheat and thus, the thermostat would not allow the vacuum to operate until it cools. If this is the case, change your bag, filter, and drop a penny through the hose(unattached from the vacuum and power nozzle) to check for blockage. Chances are, this is where your problem lies.