Hoover carpet cleaner makes a high-pitched whistling noise during use

Safety first: Unplug the unit before inspecting seals and gaskets.

• Check tank seals: Inspect the dirty water tank gasket and lid for damage. Replace if worn.
• Inspect nozzle: Look for cracks or gaps in the nozzle assembly. Ensure it snaps fully into place.
• Check hose connections: Verify that the hose is fully inserted and locked at both ends.
• Listen for leaks: With the unit running (and safe), move your hand around joints and seals to feel for escaping air, then address the identified leak.