When this happens, it almost always means the hinge is out of adjustment or set too low on the back of the kiln.
- When the kiln is cold, remove the spring tension if there is a spring (spring removal step-by-step in the assembly instructions in the kiln manual) and just loosen all of the screws that hold the hinge to the kiln body.
- Then raise the kiln body part of the hinge until starts to pick up the back of the lid.
- Lower it down until the lid barely touches the top kiln section and tighten all the screws again.
- If this does not fix it try a firing without the hinge spring on the kiln.
- Try a firing with the hinge not connected at all just to see what is causing the problem.