Hardware Model Specification

Huawei FusionSolar SUN2000 Series (L1/M1/M2/M3) Diagnostics

Classification: Solar Inverters & Energy Storage Equipment

Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the Huawei FusionSolar SUN2000 Series (L1/M1/M2/M3).

1 Documented Faults • Full Multimeter & Safety Isolation Procedures

Indexed Fault Codes for SUN2000 Series (L1/M1/M2/M3)

Step-by-step resolution manuals and root cause matrices

1 Codes

CODE Alarm 2064 Severity: Critical Difficulty: Advanced

Excessive Ground Leakage Current Trip

Alarm 2064 triggers when the inverter's internal Residual Current Monitoring Unit (RCMU) detects continuous or surging leakage current (Idc/Iac) to protective earth exceeding safety thresholds (typically >300 mA surge or sustained >30 mA difference), characteristic of parasitic capacitance discharge or isolation degradation in transformerless topologies.

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