Resolve Error 163B "Mail Piece Too Long" on the DM500, DM525 and more

Products affected: DM500™, DM525™, DM550™, DM575™, DM800™, DM800i™


The meter displays error code 163B and "Mail Piece Too Long" and will not run mail.


The mail piece is too long.


UPDATED: September 1, 2017
This error occurs when the mail piece is too long. The maximum length of a mail piece for this machine is 13 inches (330 mm).

If the mail piece is within these specifications, reboot the machine and clear the mail path:
  1. Turn the power off with the power switch.
  2. Wait for the display to turn off.
  3. Using a can of non-flammable canned air and working from the left side of the machine to the exit, blow onto the feed deck that the envelopes travel on.
  4. Wait one to three minutes.
  5. Turn the power switch back on.
If the issue is not resolved, contact customer support from 8 am to 8 pm Eastern Time. Please have your model number ready.