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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.

978

Communication error between Fronius Symo Hybrid and Fronius Solar Battery

Fronius · Solar Energy

What does 978 mean?

A communication error exists between the Fronius Symo Hybrid inverter and the Fronius Solar Battery. This prevents battery operation, but grid feed-in will resume.

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

    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