1020 on a Sigenergy SigenStor: Abnormal AFCI self-checking circuit. Official suggestion (summarised): As 1009: open DC switch, inspect, repair, clear AFCI fault in app
Short answer
On a Sigenergy inverter, 1020 means: Abnormal AFCI self-checking circuit. Official suggestion (summarised): As 1009: open DC switch, inspect, repair, clear AFCI fault in app. The inverter stops until the fault clears or is reset. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Abnormal AFCI self-checking circuit. Official suggestion (summarised): As 1009: open DC switch, inspect, repair, clear AFCI fault in app.
Likely causes:
- DC arc-detection self-check failed.
Is it safe?
| Does the inverter stop? | Yes |
|---|---|
| Severity | Fault — needs a manual reset once the cause is fixed |
| Engineer needed? | Yes |
The inverter stops until the fault clears or is reset.
Resetting itself: no.
Manual reset: see notes.
What you can check
- Read the alarm code, name and ID in the mySigen app.
- Report it via mySigen app Support > Troubleshooting (Sigenergy's stated route) or contact your installer.
What the engineer will check
- DC inspection; AFCI circuit fault escalation.
- Sub-IDs: ID1-ID20 AFCI self-check circuit n fault.
Who to ask for: battery storage / PV inverter.
Certification: Sigenergy-trained installer; MCS PV/battery installer for certified installs; electrical work to BS 7671.
What you might notice
Sources
- Sigenergy Alarm List (Version 05) ↗ · 05 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026