Beisler 739-23-1 Program - Manual (Page 27)

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1.8 Special functions for the repair of a thread breakage
After a thread breakage has occurred, the sewing machine must be
switched off, re-threaded and then switched on again.
To insert the needle thread and the bobbin thread under the thread
cutter hook after threading, proceed as follows:
–
Press the “1" key.
The display reads as follows:
The thread cutter is activated for one second. Within this time, both
threads can be placed under the hook.
After one second, the basic display appears.
1.9 Thread breakage in seam (needle thread)
If a thread breakage occurs in the seam, the sewing process is
interrupted and an error / warning message is displayed.
Note
The “Err” display is blinking.
(Error group 0, error number 1 = needle thread broken)