An Ed visa is specifically for students and cannot be used for employment in Thailand. To work in a school, you need a Non-B visa and a work permit. Attempting to work on an Ed visa can lead to severe consequences, including deportation and potential blacklisting.
Steve ********
That would be a work visa
Steve *******
The ED visa is for studying while in the country, not working. Working requires a work permit and appropriate visa.
Eric *****
If not you can get deported and black listed for 10 years and go to jail on the top