This usually happens if the fill lid isn't seated correctly on its hinge or if the reservoir is overfilled.
- First, empty the pitcher and reservoir completely.
- Check the fill lid. Make sure it's centered on the hinge pin at the back of the reservoir.
- Gently press down on the lid near the hinge to ensure it's fully seated.
- Now, refill the reservoir. If your model has a "Max Fill" line, do not exceed it. If it doesn't, fill it with cold tap water and stop before the water touches the bottom of the closed lid.
- Close the lid firmly. It should latch shut.
If it's still stuck, inspect for debris or a warped lid. Hand-wash the lid with mild detergent, rinse well, and let it air dry completely before trying again.