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The negative pressure handle has no suction, the solution:
1. Determine whether the filter is installed. (the white one, next to the switch)
2. There is a rotary button on the right side of the machine to adjust the suction power. The suction power can be adjusted through it
3. Test whether the skin is completely covered. The negative pressure handle works by means of vacuum negative pressure. If there is a gap, the vacuum state cannot be achieved.