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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.

108

Stand-alone operation detected

Fronius · Solar Energy

What does 108 mean?

The inverter has detected an unintentional stand-alone operation (island mode), meaning it is operating independently from the main grid. This is typically a safety mechanism to prevent unsynchronized grid reconnection.

Common Causes

  • Inverter operating in an unintended island mode
  • Poor or intermittent AC grid connection leading to grid isolation detection

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check all AC grid connections at the inverter and point of common coupling

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 123)Search more codes in this manual