There can be quite a number of causes for these problems. A lot of the time there is a clog that the consumer has not found. If the motor sounds like it is running at a high pitched noise, and there is low or no suction, then that's your problem.
With the over full bag problem, I might have to know a little more information. There may be a reset button on the machine. You are going to want to check around the base of the machine where the brush roll is. Also, a good thing to do is to just change the bag and give the machine about 15 minutes before you turn it back on. It's high unlikely that you shorted-out the thermal protector with one time of not changing the bag.
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There could be numerous reasons for this. What I would try in this order to help troubleshoot is this:
1. If you wiggle the power cord near where it inserts into the vacuum cleaner itself, does the vacuum turn on and off constantly? If so, you have a damaged cord or loose connections that need to be fixed.
2. Has the bag been emptied, and if the vacuum has a filter element, has this been cleaned? Vacuums may cutout if they get too hot. A vacuum can overheat if either the bag is full, the filter is blocked, or there are other obstructions to airflow, which cause the motor to work harder and draw more voltage, resulting in more heat. It may have a thermal cutoff which is tripping constantly. Solution is to ensure bag is not full, or less than 3/4 full, any air filters are cleaned and check for any other obstructions in the air flow paths.
3. Ensure the power supply is adequate for the vacuum. Try running it without long extension cords if you have been using those.
4. Check and clean the switch. Sticky or dust contacts on switches can cause variable cycling (cutting out and restarting).
In my bag vac, I have found that when the light shows the bag is full when its not that there is something between where it sucks into the vac to where it empties into the bag...maybe cat hair, dog hair....etc. Try removing the bag and running it, this may allow the air to flow alittle faster and force out the jam. You may also try removing the bottom of the vac, usually just a few screws, and checking to see if you can see the jam. What is happening is this jam is slowing down the air flow and the vac thinks the bag is full....also check the filter where the air leaves the bag area...also look where the bag connects, sometimes trash can hang there.....good luck
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 !
It normally won't over heat unless the bag is too full, the filters are clogged, or you have have a clog in the hose or down by the brush roll, the inlet may be clogged. Some will restart after a while, some others have a reset to push. If it won't power on, then you have a problem and it will have to serviced.