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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.

437

Power stage set problem

Fronius · Symo Advanced Manual

What does 437 mean?

A problem has been detected within the inverter's power stage set, which is responsible for the actual power conversion and grid interaction. This indicates a malfunction in the high-power section of the device.

Common Causes

  • Failure of power semiconductor components (e.g., IGBTs, MOSFETs)
  • Fault in the power stage control circuitry
  • Damage to the power stage module

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