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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.

37

RI Charge Error

Fronius · Perfect Charging

What does 37 mean?

An error occurred during the RI (Internal Resistance) charging process. This specialized charging method monitors battery internal resistance, and a fault indicates a significant deviation from expected behavior or a measurement issue with this diagnostic cycle.

Common Causes

  • A significant and unexpected change or instability in the battery's internal resistance during the RI charge measurement.
  • Malfunction in the charger's dedicated RI measurement circuit or its associated sensors.
  • The battery condition is not suitable for RI charging, or the battery itself is severely degraded.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Assess the battery's internal resistance independently using a dedicated battery diagnostic tool to confirm its health.

  2. 2

    Consult the charger's specific manual for troubleshooting steps related to RI charging diagnostics.

  3. 3

    Verify the charger's RI charging parameters and settings to ensure they are appropriate for the connected battery type.

Browse all codes in this manual (61)
Verified technical data. Last updated: April 2026

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Source: Fronius Perfect Charging
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