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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.

516

No communication possible with the storage unit

Fronius · Symo Advanced Manual

What does 516 mean?

Communication has been lost with the connected energy storage unit. This prevents the inverter from coordinating with the battery system for charging or discharging.

Common Causes

  • Loose or damaged communication cable to the storage unit
  • Malfunction of the storage unit's communication interface
  • Software incompatibility between inverter and storage unit

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 44)Search more codes in this manual