Service At 500hrs is to be sure to protect your motor by changing the carbon brushes. Note, the vacuum will not stop after 500 hours, but if it continues without service, it could burn out the motor if the carbon brushes aren’t changed
When the light turns red, it means the carbon brushes need replacement
But before this happen, the orange light will warn you to change the carbon brushes, which you can do easily at home.
Changing the carbon brushes will make your unit good for another 500 hours or more depending on the usage of your system