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ErrorLib — Industrial Fault Code Library

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979

Communication error between Fronius Symo Hybrid and Fronius Solar Battery

Fronius · Solar Energy

What does 979 mean?

A communication error exists between the Fronius Symo Hybrid inverter and the Fronius Solar Battery. Battery operation is not possible, and grid feed-in resumes. This code is displayed if not in standby mode.

Common Causes

  • Loose or damaged communication wiring between the inverter and battery
  • Faulty communication interface on either device

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    If the system is not in standby mode, check the communication wiring between the Fronius Symo Hybrid inverter and the Fronius Solar Battery

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 131)Search more codes in this manual