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Check your bag or collection area and see if it is full or clogged.
low air flow may cause extra heat and temp override.
see if hose is clogged you can place hose over exhaust and feel air pressure.
a visual for hose if clogged would be that hose will bunch up.
Some of these units have had trouble with the motors and this is what causes them to shut off. NuTone has been pretty good about replacing them under warranty. 1-888-336-6151.
It's possible the thermal reset is defective. It shuts the motor off if it gets hot. Remove the bag door and take the bag off, remove both filters and then turn the vacuum on, just leave it sit there with the motor running. This eliminates the bag or filters causing any airflow resistance. If it still shuts off after a few minutes it's likely the thermal reset is bad. Some vacuums have an external thermal reset button which can be replaced if necessary but on your model it is built into the motor and you must replace the motor. If the motor runs fine put the bag and the filter under the bag back in - (make sure the filter is clean and not restricting airflow) put the bag cover on then turn it on again. If it overheats and shuts off then you may have a clog on there somewhere restricting the airflow. If so check the power nozzle area, the hose coming from the power nozzle, the extension hose and wands for clogs or restrictions.
It sounds like it's draging on the motor Also heating up the thermister switch. I would recomend having this look at from a vacuum repair shop ask for free estimates if you call around. save some $$$
Sounds like it is stopped up. The vac gets overheated and the thermal switch does its job. Check suction from the hose and see what you get. If good then check the brush housing for a clog.
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