How do I read the “Error Status or LED Codes” for my Star Micronics printer?

Fix Error Light: If a printer is malfunctioning, the LED indicators located on the operation or control panel will report the printer error condition. Each LED pattern indicates a specific condition error.
For cross reference between LED indications and errors on your printer, refer to the user manual of the product in use. User manuals are available for free to download at the Star Global Support Site.

TSP100III Online manuals:

TSP100IIIW LED Display
TSP100IIILAN LED Display
TSP100IIIU LED Display
TSP100IIIBI LED Display

LED Cross Reference Chart

TSP650II:

TSP700II:

TSP800II:

SP700:

TSP100ECO:

TUP500: