Error description 237-13821

Error message

13821 UM (FS.B): 3.3V(FS.A) voltage monitor below limit CC%2 %1

Cause of error

- The internal voltage monitor detected that the 3.3 V voltage of the FS.A is too low

Error correction

Restart the control; if the error occurs again, then:
- Check the X76 jumper plugs
- Replace device
- Inform your service agency