Alarm ID | Alarm Name | Alarm Severity | Possible Cause | Troubleshooting Suggestion |
2001 | High String Input Voltage | Major | The PV array is not properly configured. Excessive PV modules are connected in series to the PV string, and therefore the open-circuit voltage exceeds the maximum inverter operating voltage. | Reduce the number of PV modules connected in series to the PV string until the PV string open-circuit voltage is less than or equal to the maximum inverter operating voltage. After the PV array is correctly configured, the inverter alarm disappears. |
| | | Cause ID 1 = PV1 | |
| | | Cause ID 2 = PV2 | |
2002 | DC Arc Fault | Major | The PV string power cable arcs or is in poor contact. | Check that the PV string power cable does not arc and is in good contact. |
| | | Cause ID 1 = PV1 | |
| | | Cause ID 2 = PV2 | |
2011 | String Reverse Connection | Major | The PV string polarity is reversed. | Check whether the PV string is reversely connected to the SUN2000. If yes, wait until the PV string current decreases below 0.5 A, set DC SWITCH to OFF, and adjust the PV string polarity. |
| | | Cause ID 1 = PV1 | |
| | | Cause ID 2 = PV2 | |
2012 | String Current Backfeed | Warning | The number of PV modules connected in series to this PV string is insufficient. As a result, the end voltage is lower than that of other strings. | 1. Check whether the number of PV modules connected in series to this PV string is less than the number of PV modules connected in series to the other PV strings connected in parallel with this PV string. If yes, wait until the PV string current decreases below 0.5 A, set DC SWITCH to OFF, and adjust the number of PV modules in the PV string. |
| | | Cause ID 1 = PV1 | 2. Check whether the PV string is shaded. |
| | | Cause ID 2 = PV2 | 3. Check whether the open-circuit voltage of the PV string is normal. |
2021 | AFCI Self-Check Failure | Major | Cause ID = 1, 2 | Turn off the AC output switch and DC input switch, and then turn them on after 5 minutes. If the fault persists, contact your dealer or Huawei technical support. |
| | | AFCI check fails. | |
2031 | Phase Wire Short-Circuited to PE | Major | Cause ID = 1 | Check the impedance of the output phase wire to PE, locate the position with lower impedance, and rectify the fault. |
| | | The impedance of the output phase wire to PE is low or the output phase wire is short-circuited to PE. | |
2032 | Grid Loss | Major | Cause ID = 1 | 1. Check that the AC voltage is normal. |
| | | The power grid experiences an outage. | 2. Check that the AC power cable is connected and that the AC switch is ON. |
| | | The AC power cable is disconnected or the AC circuit breaker is OFF. | |
2033 | Grid Undervoltage | Major | Cause ID = 1 | 1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal. |
| | | The grid voltage is below the lower threshold or the low voltage duration has lasted for more than the value specified by LVRT. | 2. If the alarm occurs frequently, check whether the grid voltage is within the acceptable range. If no, contact the local power operator. If yes, login to the mobile phone app, SmartLogger, or NMS to modify the grid undervoltage protection threshold with the consent of the local power operator. |
| | | | 3. If the fault persists, check the connection between the AC switch and the output power cable. |
2034 | Grid Overvoltage | Major | Cause ID = 1 | 1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal. |
| | | The grid voltage exceeds the higher threshold or the high voltage duration has lasted for more than the value specified by HVRT. | 2. If the alarm occurs frequently, check whether the power grid voltage is within the acceptable range. If no, contact the local power operator. If yes, log in to the mobile app, SmartLogger, or network management system (NMS) to modify the grid overvoltage protection threshold with the consent of the local power operator. |
| | | | 3. Check whether the peak voltage of the power grid is too high. If the fault persists and cannot be rectified for a long time, contact the power grid operator. |
2035 | Grid Voltage Imbalance | Major | Cause ID = 1 | 1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal. |
| | | The difference between grid phase voltages exceeds the upper threshold. | 2. If the alarm occurs frequently, check whether the power grid voltage is within the acceptable range. If no, contact the local power operator. |
| | | | 3. If the fault persists for a long time, check the connection of the AC output power cables. |
| | | | 4. If the AC output power cables are correctly connected, but the alarm persists and affects the energy yield of the PV plant, contact the local power operator. |
2036 | Grid Overfrequency | Major | Cause ID = 1 | 1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal. |
| | | Power grid exception: The actual grid frequency is higher than the requirement of the local power grid standard. | 2. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If no, contact the local power operator. If yes, log in to the mobile phone app, SmartLogger, or NMS to modify the grid underfrequency protection threshold with the consent of the local power operator. |
2037 | Grid Underfrequency | Major | Cause ID = 1 | 1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal. |
| | | Power grid exception: The actual grid frequency is lower than the requirement of the local power grid standard. | 2. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If no, contact the local power operator. If yes, log in to the mobile phone app, SmartLogger, or NMS to modify the grid underfrequency protection threshold with the consent of the local power operator. |
2038 | Unstable Grid Frequency | Major | Cause ID = 1 | 1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal. |
| | | Power grid exception: The actual grid frequency change rate does not comply with the local power grid standard. | 2. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If no, contact the local power operator. |
2039 | Output Overcurrent | Major | Cause ID = 1 | 1. The inverter monitors its external working conditions in real time. The inverter automatically recovers after the fault is rectified. |
| | | The grid voltage drops dramatically or the power grid is short-circuited. As a result, the inverter transient output current exceeds the upper threshold, and inverter protection is triggered. | 2. If the alarm occurs frequently and affects the power production of the PV plant, check whether the output is short-circuited. If the fault persists, contact your dealer or Huawei technical support. |
2040 | Output DC Component Overhigh | Major | Cause ID = 1 | 1. The inverter monitors its external working conditions in real time. The inverter automatically recovers after the fault is rectified. |
| | | The DC component in the grid current exceeds the upper threshold. | 2. If the alarm occurs frequently, contact your dealer or Huawei technical support. |
2051 | Abnormal Residual Current | Major | Cause ID = 1 | 1. If the alarm occurs accidentally, the external power cable may be abnormal temporarily. The inverter automatically recovers after the fault is rectified. |
| | | The input-to-ground insulation impedance has decreased during the inverter operation. | 2. If the alarm occurs frequently or persists, check that the impedance between the PV string and ground is not below the lower threshold. |
2061 | Abnormal Grounding | Major | Cause ID = 1 | Power off the inverter (turn off the AC output switch and DC input switch, and wait for 5 minutes), and then perform the following operations: |
| | | The neutral wire or ground cable is not connected. | 1. Check that the PE cable for the inverter is connected properly. |
| | | The PV array is grounded, but the inverter output does not connect to an isolation transformer. | 2. If the inverter is connected to the TN power grid, check whether the N cable is properly connected and whether the voltage to ground is normal. |
| | | | 3. Check whether the AC output connects to an isolation transformer. If yes, after powering on the inverter, log in to the mobile phone app, SmartLogger, or NMS and disable Grounding inspection. |
2062 | Low Insulation Resistance | Major | Cause ID = 1 | 1. Check the impedance between the PV array output and PE, and eliminate short circuits and poor insulation points. |
| | | The PV array is short-circuited to ground. | 2. Check that the PE cable for the inverter is connected correctly. |
| | | The PV array is in a moist environment and the power cable is not well insulated to ground. | 3. If you are sure that the impedance is less than the preset protection threshold in a cloudy or rainy environment, log in to the mobile phone app, SmartLogger, or NMS and reset the insulation impedance protection threshold. |
2063 | Cabinet Overtemperature | Minor | Cause ID = 1 | Check the ventilation and ambient temperature at the inverter installation position. |
| | | The inverter is installed in a place with poor ventilation. | If the ventilation is poor or the ambient temperature exceeds the upper threshold, improve the ventilation and heat dissipation. |
| | | The ambient temperature exceeds the upper threshold. | If the ventilation and ambient temperature both meet requirements, contact your dealer or Huawei technical support. |
| | | The inverter is not working properly. | |
2064 | Device Fault | Major | Cause ID = 1–12 | Turn off the AC output switch and DC input switch, and then turn them on after 5 minutes. If the fault persists, contact your dealer or Huawei technical support. |
| | | An unrecoverable fault has occurred on a circuit inside the inverter. | |
2065 | Upgrade Failed or Version Mismatch | Minor | Cause ID = 1, 2 and 4 | 1. Upgrade again. |
| | | The upgrade ends abnormally. | 2. If the upgrade fails several times, contact your dealer or Huawei technical support. |
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| | | Upgrade the inverter again if it is stuck in initialization state without generating any alarms and cannot be restored to the normal state during the upgrade when the PV inputs are disconnected and reconnected next time. | |
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2066 | License Expired | Warning | Cause ID = 1 | 1. Apply for a new certificate. |
| | | The privilege certificate has entered the grace period. | 2. Load the new certificate. |
| | | The privilege feature will be invalid soon. | |
61440 | Faulty Monitoring Unit | Minor | Cause ID = 1 | Turn off the AC output switch and DC input switch, and then turn them on after 5 minutes. If the fault persists, replace the monitoring board or contact your dealer Huawei technical support. |
| | | The flash memory is insufficient. | |
| | | The flash memory has bad sectors. | |
2067 | Faulty Power Collector | Major | Cause ID = 1 | 1. Check that the preset power meter model is the same as the actual model. |
| | | Power meter disconnection. | 2. Check that the preset communications parameters for the power meter are the same as the actual configurations. |
| | | | 3. Check that the power meter is powered on and the RS485 communications cable is connected. |
2072 | Transient AC Overvoltage | Major | Cause ID = 1 | 1. Check whether the grid connection voltage exceeds the upper threshold. If yes, contact the local power operator. |
| | | The inverter detects that the phase voltage exceeds the transient AC overvoltage protection threshold. | 2. If you have confirmed that the grid connection voltage exceeds the upper threshold and obtained the consent of the local power operator, modify the overvoltage protection threshold. |
| | | | 3. Check that the peak grid voltage does not exceed the upper threshold. |