Dirty water tank does not fill even though solution is being sprayed.

Safety first: Unplug the unit and remove the dirty water tank.

• Check tank seals: Inspect the dirty tank lid gasket and tank-to-body seal. Replace if cracked or deformed.
• Inspect suction path: Clean the suction nozzle, hose, and inlet port for blockages.
• Check motor operation: Confirm that the vacuum motor runs and produces strong suction at the inlet with the hose removed. If weak, the motor may be failing.
• Refit tank correctly: Ensure the tank is fully seated and latched to maintain an airtight seal.