The bag acts as an efficient filter that protects the motor and secondary filter, which is why it should always be used.
An electrical fault or other electrical issue..The thermal cut-out has been activated..

The thermal cut-out is a protective system that’s common to most vacuums.If the motor starts to overheat, the vacuum cuts out to prevent permanent damage or an electrical fire..In most cases, the thermal cut-out is activated when there’s reduced airflow through the machine.

A constant stream of cool air is essential for cooling down the motor, so any blockage or clog could cause the thermal cut-out to be activated..The good news is that restoring airflow is usually a matter of finding the problem and fixing it – and this can often be achieved at home.

Electrical issues, on the other hand, need professional repair.. Electrical Issues.
The first thing to check is that the vacuum is actually plugged in.As we’ll discuss later in this article, the watts of a vacuum cleaner should.
be used to judge the cleaning performance or suction power of a vacuum.The only thing it’s useful for is estimating the energy cost of running the vacuum – not the performance..
Tip: If you want to find out how much power your vacuum cleaner uses, the easiest way is to find the product page on the manufacturer’s website.This will nearly always list the amount of power required by the vacuum.. What Does Wattage Really Mean?.
(Editor: Top Projectors)