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Blue LED glowing

Blue LED glowing — Communication active

SMA · SUNNY BOY Solar Inverters

What does Blue LED glowing mean?

A solid blue LED indicates an active communication connection. This means the inverter is successfully connected to a local network or directly to an end device (computer, tablet, smartphone) via Ethernet.

Common Causes

  • Successful connection to a local area network (LAN/WLAN).
  • Successful direct connection to a computing device for monitoring or configuration.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    No action needed, this indicates a successful communication link.

  2. 2

    You can now access the inverter's user interface or monitor it through Sunny Portal.

  3. 3

    If you experience issues accessing data, check the network settings on your connected device.

Browse all codes in this manual (31)
Verified technical data. Last updated: April 2026

Related Faults

1501Event 1501 — Reconnection fault, grid data mismatch301Event 301 — Grid fault, voltage out of range3301, 3303Event 3301 or 3303 — Unstable operation, insufficient DC power
Source: SMA SUNNY BOY Solar Inverters
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