Diagnosis
The lid is not locking because it is not correctly aligned and seated on the stoneware insert, or the silicone sealing gasket is obstructing a proper seal. The locking tabs on the lid must physically hook under the handles on the base unit, which is only possible when the lid is perfectly flush.
How to Fix It
- Ensure the stoneware is properly placed inside the metal base. The stoneware's handles should align with the base's handles.
- Position the lid on the stoneware, carefully matching the oval shape front-to-back. The lid's locking tabs should be on the same sides as the base handles.
- Apply firm, even pressure across the top of the lid to seat it completely. You should hear or feel a slight suction release if the seal was uneven.
- With the lid fully seated, rotate the two locking latches downward until they audibly click and securely hook under the base's handles.
If That Didn't Work
Inspect the clear silicone gasket that runs along the underside rim of the lid. Remove it completely, clean it and the channel it sits in, then re-install it, ensuring it lays flat with no twists or folds. Also, check for hairline cracks in the plastic locking tabs on the lid or damage to the base handles they hook onto. A warped stoneware rim from thermal shock can also prevent sealing.
Heads Up
Never force the latches closed. If they won't rotate, the lid is misaligned. Transporting the unit without the lid securely locked is a major spill hazard. Do not use the cooker if the latches are broken.