How to resolve cover open on the DM400, DM500 and more

Products affected: DM400™, DM500™, DM550™, DM800™, DM800i™, DM900™, DM1000™, and DM1100™


The meter displays the message Cover Open and will not run mail.


A cover is not closed completely.


  1. Turn machine off by toggling the on/off switch,located on the left side of the equipment
  2. Open up the top covers. Ensure that all of the blue levers are pushed back down into the machine. If a lever is sticking up the top cover may not close completely
    • For the DM500, DM550, DM800i, DM800, and DM900 mailing machines, ensure that the transport deck (located in front of the printer at the exit of the machine) is pushed up completely
    • For the DM1000 and DM1100 mailing machines, when the cover is opened, ensure that the white interlock finger, located in the oval shape opening is centered
  3. Close up all top covers
  4. Turn the power switch back on
If your issue is not resolved, contact customer support from 8 am to 8 pm Eastern Time. Have your model number ready.

UPDATED: May 19, 2015