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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.

407

AC module temperature sensor faulty

Fronius · Symo Advanced Manual

What does 407 mean?

The temperature sensor monitoring the AC power module within the inverter is reporting a fault. This can lead to inaccurate temperature readings and potentially affect thermal management.

Common Causes

  • Malfunction or damage to the internal AC module temperature sensor
  • Loose connection of the temperature sensor wiring

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 42)Search more codes in this manual