Brother QL820NWBC User Manual page 191

Troubleshooting
Status LED Condition
End of DK Roll
Feed error
17
Transmission error
Database search error
Access point search error
Access point connection error
Security error
(Once for 2 seconds) No template selected
The DK Roll Compartment Cover is opened while the printer is in use
No media error
Incorrect media error
Communication command error
Two-color media high resolution printing error
Cutter error
Mass storage error
(Twice for 2 seconds) System error
181