Internal fault (e.g. DC disconnector)

What does 712 mean?

The Fronius Primo GEN24 208-240 inverter has detected an internal fault associated with its integrated DC disconnector. This indicates a potential malfunction of the disconnector or its internal sensing, preventing safe and reliable operation.

• Internal fault (e.g. DC disconnector).
• DC disconnector stuck or faulty.
• Wiring issue related to the DC disconnector.

Click steps to track your progress.

1. 1

   Manually operate the external DC disconnector several times to ensure it moves freely and makes proper contact in both ON and OFF positions.

2. 2

   Check the DC input wiring to the Fronius Primo GEN24 208-240 inverter, ensuring all connections are secure and there are no signs of damage or corrosion that could affect the disconnector's operation or sensing.

3. 3

   Perform a full power cycle of the inverter, including opening the AC breaker, operating the DC disconnector, waiting, and then re-energizing.

4. 4

   If the disconnector appears physically fine but the error persists, there may be an issue with the internal sensing mechanism of the disconnector.

5. 5

   If the fault does not clear, the DC disconnector or its internal control may be faulty, requiring service; contact Fronius service.