Citizen CT-S2000DC User Manual page 24

Lighting and blinking status of each error including the above is shown below.
Status
Paper-end
Paper near-end
Cover open
Cover open error *1
Cutter lock error
Head overheat error
Motor overheat error
Memory check error
Low voltage error
High voltage error
Macro execution
wait *2
Black Mark detection
error
*1: When the printer is printing.
*2: The ERROR LED may blink even in the execution of macro function.
POWER LED
Lights Lights
Lights Lights
Lights Lights
Lights
Lights
Lights
Lights
Lights
Lights
Lights
Lights
Lights
ERROR LED
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Buzzer