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bag light is on, vacuum turns off, bag is empty?

why is light on and bag is empty
Gina, May 2015
And with the cooling air restricted the overheat safety cut-out operates to save the motor catching fire.

He didn't tell you that..., May 2015
Vacuums draw air over the motor to cool it. It passes through a filter first - people forget to clean the filter. Airflow and cooling gradually decline.

You probably have a dirty filter., May 2015