Vacuum produces a whistling noise from the handle or filter area, even when suction seems normal.

Safety first: Remove the battery before inspecting.

• Step 1 – Identify source: Run the vacuum briefly and listen closely to locate the whistling area, then switch off and remove the battery.
• Step 2 – Check filter cover and grill: Ensure the HEPA filter cover and any grills are fully seated and latched.
• Step 3 – Inspect for gaps or cracks: Look for small cracks or gaps around the filter housing. Tighten any nearby screws.
• Step 4 – Replace damaged parts: If a grill or cover is cracked, replace it with a genuine Princess component.