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ErrorLib — Industrial Fault Code Library

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306

PV output too low for feeding energy into the grid

Fronius · Symo Advanced Manual

What does 306 mean?

The power generated by the photovoltaic array is insufficient to meet the minimum threshold required for the inverter to feed energy into the grid. This causes a short-term interruption, but the inverter will resume its start-up routine when conditions improve. This status code is routinely displayed during periods of low insolation (e.g., morning and evening) and does not indicate a fault at those times.

Common Causes

  • Insufficient solar insolation on the PV array (e.g., dawn, dusk, heavy cloud cover, shading)
  • Partial or complete covering of solar modules (e.g., snow, debris)

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Wait for a sufficient level of insolation (sunlight) on the solar modules.

  2. 2

    Check that solar modules are not covered by snow, shade, or other obstructions.

  3. 3

    If this status code keeps recurring outside of normal low light periods, contact your system engineer.

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

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102AC voltage too high103AC voltage too low105AC frequency too high
Source: Fronius Symo Advanced Manual
Open Manual (Page 42)Search more codes in this manual