566 on a Fronius International GmbH Fronius SnapINverter: Arc detector switched off (e.g. during external arc monitoring)
Short answer
On a Fronius International GmbH inverter, 566 means: Arc detector switched off (e.g. during external arc monitoring). The inverter keeps running. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Arc detector switched off (e.g. during external arc monitoring).
Part involved: arc fault detection.
When it shows: Class 5 status code.
Likely causes:
- Displayed every day until the arc detector is reactivated; no error; confirm status code by pressing Enter.
Is it safe?
| Does the inverter stop? | No |
|---|---|
| Severity | Information only |
| Engineer needed? | Yes |
The inverter keeps running.
Resetting itself: no.
Manual reset: Acknowledge on display (Enter key).
What you can check
- Read the state code on the inverter display or in Fronius Solar.web and note date/time for your installer.
- Acknowledge by pressing Enter; ask installer whether arc detection should be re-enabled.
What the engineer will check
- Reactivate arc detector if external monitoring not present.
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