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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

10253

[Interface]: connection speed goes to [100 Mbit / 10 Mbit]

SMA · Sunny Boy Solar Inverter

What does 10253 mean?

The network data transfer rate of the inverter's interface has changed, specifically dropping to 10 Mbit. This reduced speed can severely impact communication performance and indicates an underlying issue with the physical connection.

Common Causes

  • Defective network plug.
  • Defective network cable.
  • Network connector being pulled or plugged, causing a momentary disruption and speed renegotiation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure that the Ethernet network cable and network connector are not damaged.

  2. 2

    Verify that the network connectors are correctly plugged into their respective ports.

  3. 3

    Ensure the DHCP server (router) and any network switches are signaling correct operation.

Browse all codes in this manual (23)
Verified technical data. Last updated: April 2026

Related Faults

101Grid fault10252[Interface]: communication disrupted10254[Interface]: duplex mode goes to [Full / Half]
Source: SMA Sunny Boy Solar Inverter
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