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407
Temperature sensor on heat sink defective or not connected
Cause: Temperature sensor in power stage set not connected
Remedy: Replace power stage set
Cause: Defective temperature sensor in power stage set
Remedy: Replace power stage set
Cause: Defective temperature measurement in power stage set
Remedy: Replace power stage set
408
An imbalance has been detected in the public grid
Cause: Public grid unclean
Remedy: Error is remedied automatically
Cause: Loose contact on grid power lines
Remedy: Check grid lead
Cause: Measurement wiring for power stage set defective
Remedy: Replace power stage set
Cause: Controller in power stage set defective
Remedy: Replace power stage set
412
The fixed voltage set is considerably higher than the open circuit voltage of the solar mod-
ules
Cause: DC voltage of the solar modules is higher than the maximum input voltage of
the inverter
Remedy: Change connection of the solar modules
Cause: Transformation ratio of the transformer does not match the solar module volt-
age
Remedy: Set the operating mode of the Fronius CL to MPP mode in the Service menu
Remedy: Set fixed voltage to the correct value in the Service menu
413
Open circuit voltage too high during transformer switchover
Cause: MPP tracking is adjusted automatically - Fronius CL is restarted
Remedy: Calculate voltage and temporarily set to FIX mode in the Service menu
Cause: Overdimensioning of the solar modules. Inverter starts derating
Remedy: Check solar module voltage and change connection
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