Huawei SUN2000 Error Code Index
Huawei SUN2000 inverters use structured alarm codes to indicate faults related to grid conditions, communication systems, PV input, battery systems, and internal inverter protection.
This page provides a central index of Huawei error codes with direct links to detailed troubleshooting guides.
⚡ Grid Related Error Codes
| Error Code | Alarm Name | Description | Guide |
|---|---|---|---|
| 2032 | Grid Fault / Grid Abnormal | Grid voltage or frequency out of range | → Huawei Error 2032 |
| 2033 | Grid Undervoltage | AC voltage below allowed limit | → Huawei Error 2033 |
| 2034 | Grid Overvoltage | AC voltage above allowed limit | → Huawei Error 2034 |
| 2035 | Grid Overfrequency | Grid frequency too high | → Huawei Error 2035 |
| 2036 | Grid Underfrequency | Grid frequency too low | → Huawei Error 2036 |
| 2037 | Grid Loss | No grid detected | → Grid Fault Guide |
📡 Communication Error Codes
| Error Code | Alarm Name | Description | Guide |
|---|---|---|---|
| 2001 | Communication Failure | Loss of communication between devices | → Huawei SUN2000 Communication Faults |
| 2011 | Meter Communication Fault | Smart meter not responding | → Smart Logger Cannot Detect Devices |
| 2012 | Battery Communication Fault | Battery system communication error | → Huawei Battery Troubleshooting |
| 2021 | RS485 Communication Error | RS485 bus communication failure | → Incorrect RS485 Polarity |
| 2022 | Device Not Detected | Device missing in scan | → Smart Logger Cannot Detect Devices |
☀️ DC / PV Input Fault Codes
| Error Code | Alarm Name | Description | Guide |
|---|---|---|---|
| 2101 | PV Overvoltage | DC input voltage too high | → PV String Fault Guide |
| 2102 | PV Reverse Polarity | PV string wiring reversed | → PV Troubleshooting Guide |
| 2103 | PV Overcurrent | Excess current in DC input | → PV Fault Guide |
| 2104 | Insulation Resistance Fault | Low insulation resistance detected | → PV Insulation Fault Guide |
| 2105 | Arc Fault (AFCI) | DC arc detected | → PV Arc Fault Guide |
🔋 Battery Error Codes (LUNA2000 Systems)
| Error Code | Alarm Name | Description | Guide |
|---|---|---|---|
| 2201 | Battery Communication Failure | No communication with BMS | → Huawei Battery Faults |
| 2202 | Battery Not Detected | Battery missing in system | → Huawei Battery Troubleshooting |
| 2203 | SOC Abnormal | Incorrect state of charge reading | → Battery Diagnostics Guide |
| 2204 | Charge/Discharge Fault | Power flow restriction | → Huawei Battery Faults |
⚙️ Internal Inverter Faults
| Error Code | Alarm Name | Description | Guide |
|---|---|---|---|
| 2301 | Overtemperature | Inverter temperature too high | → Inverter Thermal Issues |
| 2302 | Relay Fault | Internal relay failure | → Huawei Inverter Faults |
| 2303 | DC Bus Fault | Internal DC circuit issue | → Huawei Inverter Faults |
| 2304 | Internal Communication Fault | Internal board communication error | → Huawei Service Guide |
🧠 Huawei Alarm Structure Explanation
Huawei SUN2000 alarms are structured into:
- Numeric Alarm Code
- Alarm Name
- Severity Level (Warning / Major / Critical)
Example:
2032 → Grid Fault (Automatic disconnection)
2033 → Grid Undervoltage
2001 → Communication Failure
🧩 Huawei Troubleshooting Structure
For proper diagnostics, always follow this hierarchy:
1. Physical Layer (Wiring)
→ Incorrect RS485 Polarity
→ RS485 Termination Resistor Problems
2. Configuration Layer
→ Modbus Address Conflict
→ Baud Rate Mismatch
3. Device Layer
→ Smart Logger Cannot Detect Devices
→ Huawei SUN2000 Communication Faults
4. System Layer
→ Grid Faults & Voltage Issues
🔗 Related Huawei Troubleshooting Guides
- → Huawei Error Codes Guide (Hub)
- → Huawei Error 2032: Grid Fault / Grid Abnormal
- → Huawei Error 2033: Grid Undervoltage
- → Huawei Error 2034: Grid Overvoltage
- → Smart Logger Cannot Detect Devices
- → Incorrect RS485 Polarity
- → Modbus Address Conflict
- → RS485 Termination Resistor Problems
- → Huawei SUN2000 Communication Faults
📌 When to Use This Index
Use this page when:
- Searching Huawei alarm numbers
- Diagnosing inverter faults
- Commissioning PV systems
- Troubleshooting communication issues
- Cross-referencing error codes in FusionSolar
🧾 Conclusion
Huawei SUN2000 error codes cover grid, communication, PV input, battery, and internal inverter protection systems.
This index helps quickly identify the meaning of each alarm and directs you to detailed troubleshooting guides for faster diagnosis and repair.