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

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

• Check valve position: Ensure the steam release knob or lever is set to the correct 'Sealing' position for pressure cooking.
• Clean valve components: After the cooker cools and depressurizes, remove the valve cap and clean all parts with warm soapy water. Use a brush to clear small holes.
• Inspect valve gasket: Replace the small silicone gasket or cap on the valve if it is cracked or hardened.
• Verify secondary vent is clear: Clean any additional vent holes in the lid to ensure proper pressure regulation.