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448

448 Neutral conductor not connected - Missing AC neutral connection.

Fronius · Primo Solar Inverter

What does 448 mean?

The inverter is detecting that the neutral conductor on its AC side is not properly connected. This is a critical wiring issue that prevents proper grid power feed.

Common Causes

  • Loose or disconnected neutral wire in the AC wiring.
  • Wiring error during installation.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform an AC reset by switching the automatic circuit breaker for the inverter off and then on again.

  2. 2

    A qualified electrician must check the AC wiring connections at the inverter and breaker for any obvious disconnections.

  3. 3

    If the status code persists, contact your system installer or a qualified electrician to inspect the AC wiring.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

240240 Arc detected - Brief detection of an electrical arc.241241 Arc detected - Inverter disconnected due to a confirmed arc.242242 Arc detected - Inverter resuming operation after arc reset.
Source: Fronius Primo Solar Inverter
Open Manual (Page 46)Search more codes in this manual