It can be disabled to stay in high mode, but you need to know what you are doing. It basically involves removing the small PCB and connecting the motor wires directly to the on/off switch. The hi/lo switch can be left in place (although not connected) or removed and a blanking plate put in it's place. You can leave a hole as this is a potential hazard and against government regulations.
SOURCE: Electrical Burning Smell from Henry HVR200 Vacuum Cleaner
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.
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