517
Power derating caused by too high a temperature
Fronius · Symo Advanced Manual
What does 517 mean?
The inverter's internal temperature has exceeded safe operating limits, causing it to automatically reduce its output power (power derating) to prevent damage. A warning message is displayed.
Common Causes
- Restricted airflow due to dust accumulation in cooling air openings or on the heat sink
- High ambient temperatures exceeding the inverter's operating range
- Malfunctioning cooling fan or temperature sensor
Repair Steps & Checklist
Click steps to track your progress.
- 1
If necessary, purge cooling air openings and the heat sink to restore proper airflow.
- 2
The fault is rectified automatically once the temperature decreases.
- 3
If this status code keeps recurring, contact your system engineer for inspection of the cooling system.
Verified technical data. Last updated: March 2026
Related Faults
Source: Fronius Symo Advanced Manual