101
Class 4 status
codes
Class 4 status codes may require the intervention of a trained Fronius service technician.
401
No internal communication with power stage set
Description The inverter will automatically attempt to connect again and, if
possible, resume feeding power into the grid
Remedy If status code persists: Contact a Fronius-trained service tech-
nician.
406
Error in temperature sensor
Description The inverter disconnects from the grid for safety reasons.
Remedy If status code persists: Contact a Fronius-trained service tech-
nician.
407
Error in temperature sensor
Description The inverter disconnects from the grid for safety reasons.
Remedy If status code persists: Contact a Fronius-trained service tech-
nician.
408
Direct current feed-in
Description The inverter disconnects from the grid for safety reasons.
Remedy If status code persists: Contact a Fronius-trained service tech-
nician.
412
The 'fixed voltage' setting has been selected instead of MPP voltage operation and the
voltage is set to a value that is too low or too high.
Description Fixed voltage lower than the current MPP voltage.
Remedy Remove excess solar modules so DC voltage fits within inverter
limits.
If the status code persists: Contact a Fronius-trained service
technician.
416
No communication between power stage set and control unit
Description The inverter disconnects from the grid for safety reasons.
Remedy If status code persists: Contact a Fronius-trained service tech-
nician.
425
Communication with the power stage set is not possible
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