438

Functional incompatibility (PC boards)

Fronius · Solar Energy

What does 438 mean?

One or more PC boards in the inverter are incompatible, possibly after a replacement. The inverter will attempt to automatically reconnect and resume grid feed-in.

Common Causes

  • Incompatible PC boards installed in the inverter
  • Incorrect PC board replacement

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Update the inverter firmware to ensure compatibility across installed PC boards

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Verified technical data. Last updated: March 2026

Related Faults

559Functional incompatibility (PC boards)313Battery input voltage too high481Functional incompatibility (PC boards)
Source: Fronius Solar Energy
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