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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.

431

Software problem

Fronius · Solar Energy

What does 431 mean?

An internal software problem has occurred within the inverter, preventing it from feeding any energy into the grid.

Common Causes

  • Internal software error or corruption

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform an AC reset by switching the automatic circuit breaker off and on again

  2. 2

    Update the inverter firmware

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

Related Faults

1Hardware fault102AC voltage too high103AC voltage too low
Source: Fronius Solar Energy
Open Manual (Page 126)Search more codes in this manual