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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.

457

Grid relay sticking

Fronius · Symo Advanced Manual

What does 457 mean?

The internal grid connection relay is physically stuck or failing to operate correctly, preventing the inverter from safely connecting or disconnecting from the grid. Consequently, the inverter is not feeding any energy.

Common Causes

  • Mechanical failure of the grid relay contacts
  • Control circuit malfunction preventing proper relay switching

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    If this status code is displayed all the time, notify a Fronius-trained service engineer.

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 43)Search more codes in this manual