6606 on a SMA Solar Technology AG Sunny Boy Smart Energy: The cause must be determined by the Service
Short answer
On a SMA Solar Technology AG inverter, 6606 means: The cause must be determined by the Service. The manual does not say whether the inverter stops. An engineer is needed to fix the cause.
Reviewed 24 September 2026 · 1 source
What it means
The manual says: The cause must be determined by the Service.
Part involved: inverter electronics (self-diagnosis).
When it shows: The cause must be determined by the Service.
Likely causes:
- SMA corrective measures: Contact Service.
Is it safe?
| Does the inverter stop? | Not stated |
|---|---|
| Engineer needed? | Yes |
The manual does not say whether the inverter stops.
Resetting itself: unknown.
Manual reset: See engineer checks.
What you can check
- Read the event number and message in the SMA Energy app / Sunny Portal (ennexOS) or the inverter's web interface and note the date/time for your installer. A red LED on the inverter means an event has occurred.
- SMA states the cause must be determined by SMA Service - contact your installer.
What the engineer will check
- Contact SMA Service; retrieve event log and device diagnostics.
Who to ask for: PV installer / SMA Service.
Certification: Qualified electrician (BS 7671; MCS-certified PV installer for work on the PV array/DC side).
What you might notice
Sources
- Operating manual SUNNY BOY SMART ENERGY 3.6/4.0/5.0/6.0/8.0/9.9 ↗ · SBSExx-50-BE-en-12 Version 1.2 · page 94 · Reviewed 24 September 2026
A code explains what the controller detected, not a confirmed root cause.
Reviewed: 24 September 2026