The vac wont start, is completely dead after i changed the bag

sucked up liquid goes with the air through the motor
that would cause the motor to burn out
with the current low cost of new vacuums , the repair /replacement of the motor would be close to a new unit
take it to an appliance repair shop and get a proper diagnosis and quote

If the ball was stuck and you sucked water into the motor it could cause it to smell like it's burning if it ruined the motor

I'm not real experienced with this model vac, but I do know that many of the newer vac's are being manufactured with a small button or lever, whatever the particular brand of vac decides would best fit on their unit, that would be located somewhere around the edge of the bag door opening and would need to be depressed by having a bag inside in order for the machine to run. I would check for something of this nature to be sure that during the bag change that you didn't just miss putting it in quite right to depress the go button. Other than that, it's entirely possible that the switch died. If that's the case you'll need to bring it in to a vac repair shop for help.

Your Sensor most likely has an internal heat sensor that is shutting off the motor. Some vacuums install an external heat sensor with a reset button that you must push to re-start the vacuum. If your model does not have an external reset button it is most likely a sensor inside the motor. If it is defective the motor must be replaced to solve the problem. But first make sure the overheating is not being caused by a blockage somewhere or the bag is too full. Air must pass completely through a vacuum starting at the floor where it picks up the dirt through all the canisters, filters, bags, etc. and then is exhausted from the vacuum. Any restrictions or blockage can cause the motor to over heat.
That Vac Guy

If the suggestion that renevacdoc did not work, it is most likely that your valve assembly(full bag control) has gone bad and needs to be replaced. You will have to take your vac to the Aerus/Electrolux dealer/service store for repair.
Joe

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

Hi! Highly unlikely that you need a new motor.  Highly likely that you need new carbon brushes.  The smell is caused by excessive sparking between the worn brushes and the copper commutator segments.  Most carbon brushes (and from memory I suspect this includes Henry's) have a copper wire buried in their last few millimeters, and you really need to change them before that becomes exposed.   The longer you run it like this, the more likely you are to damage the commutator, so change them sooner rather than later.  When you change the brushes, you can smooth off the commutator with very fine abrasive paper (the objective is to smooth it, not scratch it!), and then blow all the dust away (or **** it away if you have another vac, of course).  Incidentally, you don't say if you are using a paper bag in your Henry. Some people, because the top-hat filter is so good, try to manage without a bag.  This is false economy!  You should always use a bag. I hope this helps! I value feedback, so please remember to rate this response.

If the belt is hot or you smell it burning then chances are it has stretched a little and is slipping on either the motor shaft or beater bar shaft. If you are sure the beater bar is not restricted from turning then I would just replace it. Try this.. With the power cord disconnected, open the vac head to gain access to the beater brush and belt.. then remove the belt.. place the beater bar back into its holder and see if it easily turns by hand.. if it is free to turn..then plug the vac in and turn it on for a few seconds.. you will see and hear the motor come on but you should NOT smell anything burning at that time. If you do.. you may have another issue with the motor or power cord or both.. if you don't smell anything burning, then disconnect the power and just replace the belt.... Good luck.

the front of the machine ( the peice that holds the brush roller ) and the bag unit are part of a safety system that will only let it turn on if both are locked firmly in place, after checking that examine the cord, look for any burn marks especially at the plug and where the cord clips into the retainer on the handle and if you can where it plugs into the machine but you will probably need a set of torx screwdrivers for that. if there was any funny noises before it shut off the kids could have damaged the motor, and just because the belt isnt broken it can still get burnt and make a bad smell change them ever six months to a year

Try replacing the belt. My vacuum cleaner had the same problem and once the belt was changed the burning smell was gone.