1005 on a Sigenergy SigenStor: System grounding fault. Official suggestion (summarised): Check protective earth connection
Short answer
On a Sigenergy inverter, 1005 means: System grounding fault. Official suggestion (summarised): Check protective earth connection. 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: System grounding fault. Official suggestion (summarised): Check protective earth connection.
Likely causes:
- PE cable not grounded.
Is it safe?
Switch the inverter off at its isolator and call an engineer.
| Does the inverter stop? | Yes |
|---|---|
| Severity | Safety lockout |
| 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
- Verify PE/earthing continuity and connection.
- Sub-IDs: ID1.
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