Cause and Solution 1:

This message is displayed when thread is tangled on the wiper. Remove the tangled thread.

Cause and Solution 2:

This message is displayed when lint or dust may have accumulated within the moving knife, the fixed knife, the thread retaining plate, and their surrounding areas. Clean them.
For details, see Maintenance (Cleaning around the needle plate) .

Cause and Solution 3:

This message is displayed when the thread does not pass through the groove in the thread cutter. Pass the thread through the groove securely.

For details, see Maintenance (Cleaning the thread paths of the upper threads) .