The dials refer to types of dirt.The higher the dial the heavier the dirt.This is for the auto shut off when the bag is full.The best setting is in the middle.If you are vacuuming up fine dust suck in some Kleenex before this will coat the bag and prevent premature shu toff.
Testimonial: "I asked about the symbols, not the dial .... I know what the dial does : WHAT do the 4 symbols refer to ?"
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