Brother MW-145BT User Manual page 18

(1) If an error has occurred (indicated by a red flashing Status
LED), check for the following causes.
Error description
There is no paper cassette
installed.
The paper cassette is installed
facing the wrong direction.
There is no more paper.
A paper misfeed occurred.
A transmission error occurred.
An overheat error occurred.
(2) If a system error has occurred (indicated by a constant red
Status LED):
The printer may be damaged. Contact the sales representative
where it was purchased.
Remedy
Correctly install a paper cassette
containing paper.
→Refer to pages 15 to 17.
Remove the misfed paper.
→Refer to page 19.
Check the transmission status.
→Refer to page 34.
The inside of the printer has started
to overheat. Wait until it cools.
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General Description