Zebra Printer Error Codes
Summary
Diagram of Zebra ZD420 Indicator Light Patterns.
Note: This is not a ribbon printer. This is a direct thermal printer. If it's not printing, the most likely cause is the setting has changed to Ribbon. You will need to create an incident for IT to change the setting back to "Direct-Thermal".
IT Troubleshooting Link
https://nobis.freshservice.com/support/solutions/articles/16000041953