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