9003 on a SMA Solar Technology AG Sunny Boy: Changes to the grid parameters are now blocked. In order to be able to make changes to the grid parameters, from now on you must log in using the SMA Grid Guard code
Short answer
On a SMA Solar Technology AG inverter, 9003 means: Changes to the grid parameters are now blocked. In order to be able to make changes to the grid parameters, from now on you must log in using the SMA Grid Guard code. The inverter keeps running.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: Changes to the grid parameters are now blocked. In order to be able to make changes to the grid parameters, from now on you must log in using the SMA Grid Guard code.
Part involved: status message.
When it shows: Changes to the grid parameters are now blocked. In order to be able to make changes to the grid parameters, from now on you must log in using the SMA Grid Guard code.
Likely causes:
- SMA corrective measures: Log in as Installer and enter the SMA Grid Guard code.
Is it safe?
| Does the inverter stop? | No |
|---|---|
| Severity | Information only |
| Engineer needed? | No |
The inverter keeps running.
Resetting itself: yes.
Manual reset: Automatic when condition clears.
What you can check
- Information message only - no action needed.
What the engineer will check
- Informational (commissioning/configuration).
Sources
- Operating manual SUNNY BOY 3.0/3.6/4.0/5.0/6.0 ↗ · SBxx-1AV-41-BE-en-21 Version 2.1 · page 103 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026