Vacuum runs, but there is a whistling or hissing noise from joints or connections.

Safety: Remove the battery before inspecting connections closely.

• Check hose fit: Ensure the hose is fully inserted and locked into the inlet.
• Inspect O-rings: Look for flattened or cracked O-rings on hose ends and accessories. Replace as needed.
• Check adapters: Replace any cracked or warped adapters or couplers.
• Test after repair: Reassemble and run the vacuum to confirm the noise and leak are resolved.