Troubleshooting: The instrument needs to be relocated. Press and hold the start key 15s near the embossed hand tool screen to enter the reset positioning interface, and press the forward key to select Yes to start the reset positioning. When the manual propeller is automatically pushed to the bottom, press the back button to reset the positioning.

2. Fault: insufficient suction.

Exclusion method:

(1) Check whether the filter tank cover is covered properly.

(2) Check whether there are sealing aprons and aprons at the interface between the hand tool and the host, and check whether there are sealing aprons and aprons at the negative pressure port of the hand tool. If it is determined that the problem lies in the sealing skirt, the fault can be eliminated by replacing the sealing skirt.