Hello, and thanks for your question !!
There should be other numbers after the E, like Ec 02, E 03 and so on.
It sounds like the main circuit board has gone bad. There should be a number after the E. If there is non then the only thing you can do is have a tech out to run tests on it. Without the error codes there is no way of telling what is wrong.
How old is the machine??
Looking forward to your reply,