Lid does not lock for pressure cooking; float valve never rises.

Safety first: Do not attempt pressure cooking if the lid cannot lock properly.

• Clean float valve: Remove the float valve assembly as per Bosch instructions. Clean the pin and hole, removing any starch or scale.
• Check silicone cap: Ensure the small silicone cap or gasket on the float valve is present and undamaged. Replace if worn.
• Verify liquid level: Add at least the minimum required liquid for pressure cooking.
• Inspect sealing ring: Replace the main sealing ring if it is not sealing properly.