Error code 1803 on the DM50 and DM55

Change your connection type or your phone number to resolve error code 1803 on the DM50 or DM55 (K721) when you connect via an analogue phone line.
Products affected: DM50™, DM55™ (K721)


The franking machine displays error code 1803 and does not connect.


The telephone number that the franking machine dials must be updated.


Solution 1: Change your connection type

We recommend that you switch to a faster, more reliable digital connection. Visit or review the DM50/DM55 Installation Guide for details on all available connectivity options for your franking machine.

Solution 2: Change the phone number used by your franking machine

To continue connecting via analogue phone line, change the telephone number used by your franking machine to connect to Pitney Bowes. Please follow all the steps completely:
  1. Clear/Back button, or by restarting the franking machine, if required.
  2. Press Options.
  3. Scroll to Change Setup?, then press Enter/Yes.
  4. Scroll to Change Communication Settings?, the press Enter/Yes.
  5. Update both the Local Access phone number and Data Centre phone number, by clearing the stored number with the Clear/Back key and then:
    • UK only - enter the new phone number 08719480102, then press Enter/Yes.
    • Republic of Ireland only - enter the new phone number 0818270348, then press Enter/Yes.
  6. Restart the franking machine
    1. Remove the power cord.
    2. Wait for 60 seconds.
    3. Plug the power cord back in.
  7. Perform a balance enquiry to test your connection.

Related links

UPDATED: 22 September 2021