Lid does not lock or build pressure; float valve never rises during pressure cooking.

Safety first: Ensure the cooker is cool before disassembling the float valve.

• Check liquid level: Verify that there is enough liquid in the pot to generate steam.
• Clean float valve: Remove the float valve and its silicone cap (if accessible). Clean all parts and the valve channel with warm water and a small brush.
• Inspect silicone cap: Replace the cap if it is cracked, swollen, or missing. Use an original Oursson replacement.
• Reassemble and test: Reinstall the float valve, ensuring it moves freely. Run a short pressure program with water to confirm that the valve rises and seals.