"Unknown ink cartridge" message on the SendPro C Auto

Ensure you install the correct ink cartridge if the Unknown ink cartridge message appears.
Products affected: SendPro® C Auto (9H00)


The Unknown ink cartridge message appears when you install an ink cartridge.


You have installed the ink cartridge for a smaller postage meter.


Ensure you install the correct ink cartridge. The smaller ink cartridges 795-5 or SSl-798-0 will fit into the carriage, but will not work.

Visit our supplies site to order the correct cartridge.

UPDATED: July 31, 2023