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For an upright industrial, I would suggest a Windsor or Tennant brand. New ones are cheaper on the Windsor site- both the windsor upright and Tennant upright are made by Windsor (Just like Ford and Lincoln cars are really the same thing- even the part numbers match) Tennant sometimes sells used vacuums. The windsor is the hardest working upright I've seen, and is the easiest to work on/change brushes on. I retired from fixing cleaning equipment after 30 years. Just be sure to get the Tennant with the side hose- it'll last forever.
Here is what the owners manual of your unit lists to clean the exhaust filter.
Cleaning the exhaust filter
Open and remove the filter grill. (Fig. 4)
Remove the filter and shake out debris. (Fig. 5)
Rinse the filter in water if necessary. Let it dry before placing it
back into cleaner. (Fig. 6)
Replace filter grill.
There are two possible causes for this issue. The most likely is that your exhaust filter is blocked and so the air literally cant get out. You need to replace the exhaust Hepa Filter every six months anyway so get a new one and see if that fixes the problem. If it still is popping off after this it means the tiny lugs on the filter cover are damaged so you will need to get a new one of those.
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
there is an over temprature detector mounted on the motor ... if it gets too hot it will shut off the vacuum until it oools off a bit ... the vacuum will then come on again ... but not for long .. the problem is the lack of proper cooling air flow through the motor ... and thats almost always caused by clogged small filters for motor air intake and exhaust ... you could also have a clogged passageway blocking air to your motor .. clean or replace all filters (not just the main one) , clean out all passageways to and from the motor ... .. that should correct the problem ... if you let it continue to cycle on and off then eventually that will damage the " over temprature detector" (thermal switch)