Chosen Solution

Watch does not charge and Turn ON. Watch just heats up when on charging.

Sandeep Panjala could be an issue with the battery. I would definitely start with that one. Replace it and re-evaluate. Here is a video that shows how to change the battery yourself. If you are willing to replace it yourself, take lots of pictures. Then create a guide for all of us. https://www.ifixit.com/Guide/new

Do not charge! That means the battery is swollen and could explode! Replace the battery VERY carefully and make sure it’s discharged!