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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.

309

DC input voltage MPPT 1 too high

Fronius · Symo Advanced Manual

What does 309 mean?

The DC input voltage on Maximum Power Point (MPP) tracker 1 has exceeded its maximum permissible limit. This indicates an overvoltage condition on the specific solar string connected to MPPT1.

Common Causes

  • Overvoltage from the solar array connected to MPPT1
  • Incorrect sizing or configuration of the solar string for MPPT1

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    If this status code keeps recurring, contact your system engineer for diagnosis.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

102AC voltage too high103AC voltage too low105AC frequency too high
Source: Fronius Symo Advanced Manual
Open Manual (Page 42)Search more codes in this manual