305

No power being fed in, despite closed relay

Fronius · Symo Advanced Manual

What does 305 mean?

The inverter's internal grid relay is closed, indicating an attempt to feed power, but no energy is being supplied to the grid. This leads to a short-term interruption, followed by the inverter resuming its start-up routine.

Common Causes

  • Internal fault within the inverter's power stage preventing power generation
  • Measurement error in the power output detection circuitry

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    If this status code keeps recurring, contact your system engineer for diagnosis.

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

Related Faults

Source: Fronius Symo Advanced Manual