⚠
warning Brother
Error Code Toner - Yellow LED
Toner is low and may need replacement soon.
? What Causes This
Toner cartridge is running low on toner.
✓ How to Fix It
Prepare to replace the toner cartridge. See User's Guide Chapter 5 for replacement instructions.
Source: page 5 of the official manual
From the manual
This error code appears in:
Brother HL-2000 Monochrome Laser Printer