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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.

558

Functional incompatibility (PC boards)

Fronius · Solar Energy

What does 558 mean?

This warning indicates that one or more PC boards within the inverter are not compatible with each other. This often occurs after a PC board has been replaced with an incorrect or non-matching version.

Common Causes

  • Incompatible PC boards installed in the inverter
  • Incorrect PC board replacement

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Update the inverter firmware to ensure compatibility across installed PC boards

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 128)Search more codes in this manual