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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.

2051

Abnormal Residual Current

Huawei · SUN2000 Solar Inverter

What does 2051 mean?

The insulation impedance of the input (DC) side to PE (Protective Earth) decreases while the SUN2000 is operating. This indicates a potential insulation breakdown or ground fault on the PV side, posing a safety risk.

Common Causes

  • The insulation impedance of the input side to PE decreases when the SUN2000 is operating.
  • The external power cable may be abnormal temporarily.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check whether the impedance of the PV string to ground is excessively low.

Browse all codes in this manual (33)
Verified technical data. Last updated: April 2026

Related Faults

2001High String Input Voltage2002DC Arc Fault2003DC arc fault
Source: Huawei SUN2000 Solar Inverter
Open Manual (Page 70)Search more codes in this manual