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Blue LED flashes slowly

Blue LED flashes slowly for approx. one minute — Communication connection establishing

SMA · SUNNY BOY Solar Inverters

What does Blue LED flashes slowly mean?

The inverter is trying to establish a connection. This could be with a local network (LAN/WLAN) or directly with an end device like a computer, tablet, or smartphone via Ethernet.

Common Causes

  • Inverter is attempting to connect to a network.
  • User is trying to establish a direct connection for configuration or monitoring.
  • Network connection temporarily lost and is being re-established.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Wait for the connection to be established; the LED should become solid blue.

  2. 2

    Ensure your network (router/Wi-Fi) is operational if connecting to a local network.

  3. 3

    Verify all Ethernet cables are securely connected if using a wired connection.

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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