The lid of the casserole is mainly used to evenly heat the whole upper and lower space of the casserole to prevent the hot air from leaking out.

There is a gap in the lid. Look at the size of the gap.

If it is a small gap, it does not affect the exhaust of the casserole and can continue to be used.

If the gap is too big, it is also good to buy a high-temperature resistant glass cover, that is, the cover on the electromagnetic pot. Don't buy the same casserole again, it will be solved if you accidentally break the pot.