HUAWEI SUN2000 Inverter Fault Codes

Solar inverters, including the Huawei SUN2000 series, often have built-in diagnostic systems that display error codes to help identify and troubleshoot issues. These error codes can indicate various problems that might be occurring with the inverter or the solar power system.

If you are encountering an error code on your Huawei SUN2000 inverter, it is best to refer to the user manual or contact Future Solar WA technical support directly.

Huawei SUN2000 Alarm severities are defined as follows:

Major: The inverter is faulty. As a result, the output power decreases or the grid-tied power generation is stopped.
Minor: Some components are faulty without affecting the grid-tied power generation.
Warning: The inverter works properly. The output power decreases or some authorization functions fail due to external factors.

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Alarm ID	Alarm Name	Alarm Severity	Possible Cause	Troubleshooting Suggestion
2001	High String Input Voltage	Major	The configuration of the PV array is incorrect. The PV string has an excessive number of PV modules connected in series, resulting in the open-circuit voltage surpassing the maximum operating voltage of the inverter. Cause ID 1 = PV1 Cause ID 2 = PV2	By reducing the number of PV modules connected in series to the PV string, we can ensure that the PV string's open-circuit voltage is equal to or below the maximum operating voltage of the inverter. Once the PV array is appropriately configured, the alarm on the inverter will no longer be triggered.
2002	DC Arc Fault	Major	There are issues with the power cable of the PV string, either in the form of arcing or poor contact. Cause ID 1 = PV1 Cause ID 2 = PV2	It is crucial to verify that the power cable of the PV string does not exhibit any arcing and is in a secure and reliable contact.
2011	String Reverse Connection	Major	The PV string polarity is reversed. Cause ID 1 = PV1 Cause ID 2 = PV2	Please ensure that the PV string is not connected in reverse to the SUN2000 inverter. If it is indeed reversed, wait until the PV string current drops below 0.5 A, switch the DC SWITCH to OFF, and proceed to adjust the polarity of the PV string accordingly.
2012	String Current Backfeed	Warning	The current configuration of the PV string is inadequate due to an insufficient number of PV modules connected in series. Consequently, the end voltage of this string is lower compared to the other strings. Cause ID 1 = PV1 Cause ID 2 = PV2	Please verify if the number of PV modules linked in series to this PV string is fewer than the number of PV modules connected in series to the other PV strings linked in parallel with this particular PV string. If this condition is true, kindly wait until the PV string current drops below 0.5 A, then proceed to turn OFF the DC SWITCH. Afterwards, make necessary adjustments to the number of PV modules within the PV string. Additionally, assess whether the PV string is experiencing shading issues and confirm if the open-circuit voltage of the PV string remains within normal parameters.
2021	AFCI Self-Check Failure	Major	Cause ID = 1, 2 AFCI check fails.	To resolve the issue, it is recommended to deactivate both the AC output switch and DC input switch, and then reactivate them after a 5-minute interval. If the problem persists, we advise reaching out to your authorized dealer or seeking assistance from Huawei's dedicated technical support team.
2031	Phase Wire Short-Circuited to PE	Major	Cause ID = 1 The impedance of the output phase wire to PE is low or the output phase wire is short-circuited to PE.	Please examine the impedance of the output phase wire to the protective earth (PE) connection. Identify the location with a comparatively lower impedance and take appropriate measures to rectify the fault at that specific position.
2032	Grid Loss	Major	Cause ID = 1 In the event of a power grid outage, please check if the AC power cable is disconnected or if the AC circuit breaker is in the OFF position.	Ensure that the AC voltage is within the normal range by performing a voltage check. Additionally, verify that the AC power cable is securely connected and that the AC switch is in the ON position.
2033	Grid Undervoltage	Major	Cause ID = 1 If the grid voltage is below the lower threshold or the duration of low voltage has exceeded the specified value by LVRT (Low Voltage Ride Through), it is important to take necessary actions to address the situation.	In the event of an accidental alarm, it is possible that the power grid is temporarily experiencing abnormalities. However, rest assured that the inverter is designed to automatically recover once it detects that the power grid has returned to a normal state. To resolve frequent alarms, first verify if the grid voltage falls within the acceptable range. If it doesn't, contact the local power operator. If it does, obtain consent from the operator to adjust the grid undervoltage protection threshold using the SmartLogger mobile app or NMS. To address the persistent fault, examine the AC switch and the output power cable connection.
2034	Grid Overvoltage	Major	Cause ID = 1 If the grid voltage surpasses the upper threshold or the high voltage duration has exceeded the specified HVRT value.	In case of an accidental alarm, it could indicate temporary abnormalities in the power grid. The inverter will automatically recover once it detects that the power grid has returned to normal. For frequent alarms, first, verify if the power grid voltage falls within the acceptable range. If it doesn't, contact the local power operator. If it does, gain consent from the operator to adjust the grid overvoltage protection threshold using the SmartLogger mobile app or network management system (NMS). Additionally, check if the peak voltage of the power grid is excessively high. If the fault persists and cannot be resolved over an extended period, reach out to the power grid operator.
2035	Grid Voltage Imbalance	Major	Cause ID = 1 The grid phase voltage difference exceeds the upper threshold.	In case of an accidental alarm, it could indicate temporary abnormalities in the power grid. The inverter will automatically recover once it detects that the power grid has returned to normal. For frequent alarms, first, verify if the power grid voltage falls within the acceptable range. If it doesn't, contact the local power operator. If the fault persists over an extended period, examine the connection of the AC output power cables. If the cables are correctly connected and the alarm continues, impacting the energy yield of the PV plant, contact the local power operator.
2036	Grid Overfrequency	Major	Cause ID = 1 Power grid exception: The actual grid frequency exceeds the local power grid standard requirement.	In case of an accidental alarm, it could indicate temporary abnormalities in the power grid. The inverter will automatically recover once it detects that the power grid has returned to normal. For frequent alarms, first, verify if the grid frequency falls within the acceptable range. If it doesn't, contact the local power operator. If it does, obtain consent from the operator to adjust the grid underfrequency protection threshold using the SmartLogger mobile app or network management system (NMS).
2037	Grid Underfrequency	Major	Cause ID = 1 Power grid exception: The actual grid frequency falls below the requirement of the local power grid standard.	In case of an accidental alarm, it could indicate temporary abnormalities in the power grid. The inverter will automatically recover once it detects that the power grid has returned to normal. For frequent alarms, first, verify if the grid frequency falls within the acceptable range. If it doesn't, contact the local power operator. If it does, obtain consent from the operator to adjust the grid underfrequency protection threshold using the SmartLogger mobile app or network management system (NMS).
2038	Unstable Grid Frequency	Major	Cause ID = 1 Power grid exception: The actual change rate of the grid frequency does not meet the requirements of the local power grid standard.	In case of an accidental alarm, it could indicate temporary abnormalities in the power grid. The inverter will automatically recover once it detects that the power grid has returned to normal. For frequent alarms, first, verify if the grid frequency falls within the acceptable range. If it doesn't, contact the local power operator.
2039	Output Overcurrent	Major	Cause ID = 1 The inverter protection is triggered when there is a dramatic drop in grid voltage or a short circuit in the power grid, causing the transient output current of the inverter to exceed the upper threshold.	The inverter continuously monitors its external working conditions and automatically recovers once the fault is resolved. If frequent alarms impact the power production of the PV plant, first check for any output short-circuits. If the fault persists, it is recommended to contact your dealer or seek technical support from Huawei.
2040	Output DC Component Overhigh	Major	Cause ID = 1 The grid current's DC component exceeds the upper threshold.	The inverter continuously monitors its external working conditions in real time and will automatically recover once the fault is rectified. If frequent alarms persist, it is recommended to contact your dealer or seek technical support from Huawei.
2051	Abnormal Residual Current	Major	Cause ID = 1 The input-to-ground insulation impedance has experienced a decrease during the operation of the inverter.	In case of an accidental alarm, it could indicate temporary abnormalities in the external power cable. The inverter will automatically recover once the fault is rectified. 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 The neutral wire or ground cable is not properly connected. Additionally, although the PV array is grounded, the inverter output lacks a connection to an isolation transformer.	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: Check that the PE cable for the inverter is connected properly. 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. 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 = 1The PV The PV array is experiencing a short-circuit to ground. Furthermore, the PV array is situated in a moist environment, and the power cable lacks sufficient insulation from ground.	To address the issue, follow these steps: Verify the impedance between the PV array output and PE (Protective Earth) to identify and resolve any short circuits or poor insulation points. Ensure that the PE cable for the inverter is properly connected. If you are certain that the impedance is lower than the preset protection threshold in cloudy or rainy weather conditions, access the SmartLogger mobile app or network management system (NMS) and reset the insulation impedance protection threshold.
2063	Cabinet Overtemperature	Minor	Cause ID = 1 The inverter is installed in a place with poor ventilation. The ambient temperature exceeds the upper threshold. The inverter is not working properly.	Check the ventilation conditions and ambient temperature at the inverter installation location. If poor ventilation is identified or the ambient temperature exceeds the upper threshold, take measures to improve ventilation and enhance heat dissipation in the area. If both ventilation and ambient temperature meet the requirements but the issue persists, it is advisable to contact your dealer or seek technical support from Huawei for further assistance.
2064	Device Fault	Major	Cause ID = 1–12 An unrecoverable fault has been detected in a circuit within the inverter.	Turn off the AC output switch and DC input switch. Wait for 5 minutes. Turn on the AC output switch and DC input switch again. If the fault persists even after performing the reset, it is recommended to contact your dealer or seek technical support from Huawei for further assistance in resolving the issue.
2065	Upgrade Failed or Version Mismatch	Minor	Cause ID = 1, 2 and 4 The upgrade ends abnormally. NOTE:If the inverter is stuck in the initialization state without generating any alarms and cannot be restored to the normal state, you can try the following steps: Disconnect the PV inputs from the inverter. Initiate an upgrade process to reinstall or update the inverter's firmware. After the upgrade is complete, reconnect the PV inputs to the inverter. Monitor the inverter to ensure it successfully initializes and returns to the normal state.	Upgrade again. If the initial upgrade attempt fails to resolve the issue, you can try upgrading the inverter again. If the subsequent upgrade attempts also fail to rectify the problem, it is advisable to contact your dealer or seek technical support from Huawei. They will be able to provide further guidance and assistance in troubleshooting the upgrade issue and resolving the underlying problem.
2065	Upgrade Failed or Version Mismatch	Minor	Cause ID = 1, 2 and 4 The upgrade ends abnormally. NOTE:If the inverter remains stuck in the initialization state without generating any alarms and cannot be restored to the normal state, you can attempt the following steps: Disconnect the PV inputs from the inverter. Initiate another upgrade process to reinstall or update the inverter's firmware. After completing the upgrade, reconnect the PV inputs to the inverter. Monitor the inverter to ensure it successfully initializes and returns to the normal state.	Upgrade again. If the upgrade process continues to fail despite multiple attempts, it is recommended to contact your dealer or seek technical support from Huawei. They will be able to provide specialized assistance and guidance to resolve the upgrade issue.
2066	License Expired	Warning	Cause ID = 1 The privilege certificate is currently in the grace period, and the privilege feature will soon become invalid.	Apply for a new certificate. Load the new certificate.
61440	Faulty Monitoring Unit	Minor	Cause ID = 1 Insufficient flash memory. Faulty sectors in the flash memory.	Switch off the AC output and DC input switches. Wait for 5 minutes. Turn the switches back on. If the problem continues, consider replacing the monitoring board or reaching out to Huawei technical support through your dealer.
2067	Faulty Power Collector	Major	Cause ID = 1 Power meter disconnected.	Verify that the preset power meter model matches the actual model. Confirm that the preset communications parameters for the power meter match the actual configurations. Check that the power meter is powered on and that the RS485 communications cable is properly connected.
2072	Transient AC Overvoltage	Major	Cause ID = 1 The inverter detects phase voltage surpassing the transient AC overvoltage protection threshold.	Verify if the grid connection voltage exceeds the upper threshold. If it does, contact the local power operator for assistance. If you have confirmed the voltage exceeds the upper threshold and obtained consent from the local power operator, adjust the overvoltage protection threshold accordingly. Ensure that the peak grid voltage remains below the upper threshold.