High-pitched whistling or continuous hissing from the steam release area during pressure cooking.

Safety first: Keep face and hands away from the steam vent. Do not attempt to cover the vent.

• Check valve position: Confirm the steam release knob is turned fully to the sealing position. Some hissing during pressure build is normal, but it should reduce once pressure is reached.
• Clean valve components: After cooling, remove the valve cap/knob and soak it in warm vinegar solution to dissolve mineral deposits. Clean the valve seat on the lid with a soft brush.
• Inspect valve seal: Check any silicone or rubber seals on the valve for cracks or hardening. Replace if worn.
• Verify secondary vent: Ensure the safety valve and anti-block shield (if present) are clean and not obstructed.