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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.

307

DC low (PV input voltage too low)

Fronius · Solar Energy

What does 307 mean?

The DC input voltage from the PV system is too low for feeding energy into the grid. This causes a short-term interruption as the inverter repeats its start-up routine. This is often displayed routinely early morning or evening due to low insolation and may not indicate a fault.

Common Causes

  • Insufficient solar insolation (e.g., early morning, evening, cloudy weather)
  • Faulty PV modules or connections resulting in low voltage

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Observe the solar insolation levels and wait for sufficient sunlight

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 124)Search more codes in this manual