517 on a Fronius International GmbH Fronius SnapINverter: Power derating caused by too high a temperature
Short answer
On a Fronius International GmbH inverter, 517 means: Power derating caused by too high a temperature. The inverter keeps running with some functions stopped. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Power derating caused by too high a temperature.
Part involved: derating.
When it shows: Class 5 status code.
Likely causes:
- Purge openings for cooling air and heat sink if necessary; fault rectified automatically; if recurring contact your system engineer.
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Warning |
| Engineer needed? | Yes |
The inverter keeps running with some functions stopped.
Resetting itself: yes.
Manual reset: Automatic when condition clears.
What you can check
- Read the state code on the inverter display or in Fronius Solar.web and note date/time for your installer.
- Check nothing is stacked against, covering or boxing in the inverter and that air can flow around it; keep the area clear.
What the engineer will check
- Clean heat sink/fan; check clearances.
Who to ask for: Fronius-trained PV installer / Fronius Service Partner.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
What you might notice
Sources
- Fronius Primo 3.0-1 - 8.2-1 Operating Instructions (HTML) ↗ · 42,0410,2165 online edition · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026