i know nothing about that model, but quite often some brands display #### when the application in the HMI has allocated too few digits for the display. Your example of #### suggests that the display object on the screen is set for four digits. When the actual value of the tag linked to the display object has five digits, the HMI shows ####.
It could also mean that the tag linked to the display object does not exist in the PLC, sometimes the result of a typo in the tag name or address.
Another possibility could be that there is no communication between the HMI and the PLC, but that often shows as ????, not ####.