Guard cannot be found

What does 450 mean?

This code indicates that a critical internal 'Guard' component or function cannot be found or is not responding. This is a severe internal error, likely preventing any inverter operation and grid feeding.

• Internal hardware malfunction of a safety or control module.
• Corrupted firmware affecting critical system component recognition.
• Communication failure with an essential internal sub-system.

Click steps to track your progress.

1. 1

   If the status code is displayed continuously, notify a Fronius-trained service engineer for deep-level diagnosis.

2. 2

   Perform an AC reset by cycling the automatic circuit breaker to attempt to re-initialize all internal components.

3. 3

   Inspect internal communication paths for anomalies.