1001 on a Fronius International GmbH Fronius GEN24 / GEN24 Plus: After 24 hours of continuous feed-in an insulation measurement must be carried out
Short answer
On a Fronius International GmbH inverter, 1001 means: After 24 hours of continuous feed-in an insulation measurement must be carried out. The inverter keeps running with some functions stopped.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: After 24 hours of continuous feed-in an insulation measurement must be carried out.
Part involved: GEN24 inverter.
When it shows: After 24 hours of continuous feed-in an insulation measurement must be carried out.
Likely causes:
- No action needed - automatic.
Is it safe?
| Does the inverter stop? | Partly |
|---|---|
| Severity | Information only |
| Engineer needed? | No |
The inverter keeps running with some functions stopped.
Resetting itself: yes.
Manual reset: Automatic.
What you can check
- Check Service Messages in Fronius Solar.web or the inverter's web interface (System > Event Log) and note the code.
What the engineer will check
Who to ask for: Fronius-trained installer.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
Sources
- Help with the Fronius GEN24 (homeowner status codes) ↗ · Web page retrieved 2026-09-24 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026