Error description 237-18556

Error message

18556 UM (FS.B): watchdog error UM-FS.A CC%2 %1

Cause of error

- FS.B of the inverter reports a watchdog error FS.A (WDF.A)
- FS.A of the inverter is no longer ready

Error correction

- Reboot the control
- Inform your service agency
- Exchange the inverter, if necessary