My unit has low or lack of suction. Cause Solution Suction hose or suction tube is blocked. Remove obstructions and blockages. The metal container is not closed. Close the metal container. The metal container is full. Empty the metal container (see “Cleaning/ Maintenance” in the manual). The pleated filter is clogged. Clean or replace the pleated filter (see "Cleaning/Maintenance” in the manual). The air filter is clogged. Clean the air filter (see “Cleaning/ Maintenance” in the manual). Related articles My unit is not starting. Is there a trigger lock so you don’t have to always press with your finger to operate? How should I take care of the NJP800's stainless steel blade? How many washes can SPX3000® Xtream Handle? What steps should I take to maintain the stainless steel blade of NJP651?