#901 Door Opened/Door Issue/Door cover can’t be closed

When the system detects that the door is open, it will trigger error #901 Door Cover Open.

The usual symptom is that the system cannot detect the door-closed signal, meaning the door icon does not change to the closed state. Another symptom is that even when the door is properly closed, the error message may still appear randomly during operation.

No matter which symptom your machine shows, please follow the steps below in order:

Possible Causes