Huawei SUN2000 Error Code 111

Huawei PLC & VFD Critical DC Input

Model: SUN2000 | Code: 111

Applicable Systems
SUN2000

Symptoms

DC overvoltage detected. The PV input voltage exceeds the inverter's maximum DC input rating. The inverterdisconnects the PV input to protect the DC bus and power electronics.

Possible Causes

  • PV array open-circuit voltage exceeds inverter maximum DC voltage rating at low temperature
  • PV string configuration incorrect: too many panels in series
  • Inverter DC voltage measurement circuit fault
  • Transient DC voltage spike from PV array under partial shading conditions

Troubleshooting Steps

  1. Step 1: Check the equipment status and fault indicators to confirm the active fault code
    Fault indicator or HMI displays code 111 as active
  2. Step 2: Verify all electrical connections, wiring harnesses, and connector seating
    All connections secure, no corrosion, loose pins, or damaged wires
  3. Step 3: Check the system diagnostic buffer or event log for detailed fault information
    Diagnostic buffer shows the specific fault cause and timestamp
  4. Step 4: Verify power supply stability and environmental conditions
    Power supply stable, environment within specifications
  5. Step 5: Restart the equipment or power-cycle the control system
    Equipment restarts and enters normal operating state
  6. Step 6: Contact manufacturer support if the fault persists after all checks
    Support provides specific troubleshooting guidance

How to Reset

To reset: 1) Identify and fix the root cause described in the fault symptoms. 2) Press RESET on the HMI or controller, or power-cycle the equipment. 3) If the fault recurs, contact manufacturer service. Caution: Document the fault code and context before resetting.

Frequently Asked Questions

  • Q: What does fault code 111 mean on the Huawei SUN2000?

    Fault 111 on the Huawei SUN2000 indicates: DC overvoltage detected. The PV input voltage exceeds the inverter's maximum DC input rating. The inverter disconnects the PV input to protect the DC bus and power electronics. Refer to the equipment manual and manufacturer support for specific troubleshooting steps.

  • Q: Can I continue operating the equipment with fault 111 active?

    No. The equipment has detected a fault condition and has taken protective action (typically stopping or derating). Continuing to operate without fixing the root cause may cause further damage. Always investigate and fix the fault before resuming operation.

Related Huawei Fault Codes

Source: Huawei SUN2000 Series Inverter User Manual, Huawei Official Support (support.huawei.com)

Category: PLC & VFD