Brother T-8421B Instructions Manual page 60

11. TROUBLESHOOTING
Error code
y Is connector CN16 inside the control box
Err 21
disconnected?
(Thermistor error)
y This appears on the display when the sewing machine has continued to be used for
Err 100
a certain period after the "GrEASEUP" notification appears without the grease being
(GrEASEUP)
applied (without the reset procedure being carried out).
y Is DIP switch No.4 inside the control box set
Err 101
to ON?
(diP SW4)
If an error code that is not listed above appears or if carrying out the specified remedy does not solve
the problem, contact the place of purchase.
53
Insert the connector securely.
Apply grease and then carry out the reset procedure.
Set DIP switch No.4 to OFF.
T-8421B, 8422B, 8452B, 8722B, 8752B
Possible cause Page
*
3159M
41*
*
3160M