Huawei inverters display codes (known as Alarm IDs) for memory issues, failed internal tests, measurement issues, and other faults. Many of these error codes are one-off events, but you should seek technical support if they persist – especially if you get the same Alarm ID many times.
The error codes covered in this article apply to the following Huawei solar inverters:
– Sun2000 KTL L1
– Sun2000-KTL-M1
– Sun2000-KTL-MO
You can troubleshoot these inverter error codes using the Huawei Fusion Solar monitoring app.
It’s crucial to understand when an error has occurred, what the error code means, and how to resolve it. To that end, this post provides insights into Huawei inverter error codes and how to deal with them.
Let’s dive in!
What are Solar Inverter Error Codes?
Solar inverter error codes are numeric or alphanumeric characters displayed by solar inverters when there’s a problem with the solar system. They notify you of any situations threatening your solar system’s normal operation.
A solar inverter can quickly detect issues disrupting a solar PV system and signal you using corresponding error codes.
The primary function of solar inverters is power conversion (DC electricity to AC output). But the current line of inverters on the market does more than that. Modern smart inverters monitor your solar system’s performance and provide real-time reports.
When there is an issue, the inverter generates a corresponding solar inverter error code. However, this doesn’t mean that your inverter is faulty; issues could also arise from factors outside the system’s control or from other solar power system components.
Common Causes of Huawei Inverter Error Codes
Huawei inverter error codes occur due to grid disturbances, temperature issues, software issues, overcurrent, and other faults. Knowing each error code’s meaning will help you determine the appropriate solution to get the solar power system back to normal.
Here’s a list of common Huawei inverter error codes culprits:
Grid Voltage and Frequency Disturbances
Grid disturbances are temporary, and the inverter returns to normal when the voltage and frequency stabilise.
However, you should consult technical support if the inverter displays these faults when the grid provides adequate voltage and frequency.
Overcurrent and Other Faults
These error codes may occur as isolated events, but they may also indicate issues that require technical attention.
103 may be triggered by having too many modules in the same circuit.
106-113 may indicate shaded or damaged panels.
412 can occur due to loose wiring in the photovoltaic array.
Temperature Issues
Temperature issues may arise when you place the inverter in a poorly ventilated location or if the fan malfunctions.
Software Issues
Error codes due to software issues require you to upgrade your software as needed. You can repeat the upgrade if you encounter the ‘error 505’ message.
All Error Codes for Huawei Inverters and Solutions to Fix Them
1. 2001: High String Input Voltage
The 2001 alarm ID is a major error that pops up when a configuration issue occurs with the PV array.
Cause ID 1 = PV1 and PV2
Cause ID 2 = PV3 and PV4
To fix this error, you must reduce the number of solar modules connected in series to the PV string. Ensure that the PV string open-circuit voltage does not exceed the maximum inverter operating voltage. Once you configure the PV array correctly, the inverter alarm will disappear.
2. 2002: DC Arc Fault
The major alarm ID, 2002, appears when the PV string power cable is in poor contact or when it arcs.
Cause ID 1 = PV1 and PV2
Cause ID 2 = PV3 and PV4
To resolve the issue, ensure that the PV string power cable is in good contact.
3. 2011: String Reverse Connection
The 2011 Alarm ID occurs when the PV string polarity reverses.
Cause ID 1 = PV1
Cause ID 2 = PV2
Cause ID 3 = PV3
Cause ID 4 = PV4
To resolve this error code, ensure that the PV string connects reversely to the Sun2000. If it does, allow the PV string current to decrease below 0.5 A, then turn off the DC switch and adjust the PV string polarity.
4. 2012: String Current Backfeed
The error code 2012 is a warning alarm ID signalling you when the number of modules connected in series to the PV string is insufficient.
Cause ID 1 = PV1
Cause ID 2 = PV2
Cause ID 3 = PV3
Cause ID 4 = PV4
There are three possible solutions for the 2012 alarm ID:
- If the number of modules connected in series to the PV string is less than those connected in series to the other PV strings attached in parallel, allow the PV string current to fall under 0.5 A, then turn off the DC switch and adjust the PV string polarity.
- Ensure that the open-circuit voltage of the PV string is standard.
- Confirm that the PV string has no shading.
5. 2021: AFCI Self-Check Failure
The Alarm ID 2021 appears due to an AFCI check failure.
Cause ID = 1, 2
To fix this problem, turn off the DC input and AC output switch, and wait 5 minutes before turning them back on. Contact Huawei technical support or your dealer if the issue persists.
6. 2031: Phase Wire Short-Circuited to PE
You’ll encounter the 2031 error code when the output phase wire is short-circuited to PE or the impedance of the output phase wire to PE is low.
Cause ID = 1
Find the position with lower impedance and fix the fault to resolve it.
7. 2032: Grid Loss
This major error code occurs when the power grid encounters an outage.
Cause ID = 1
To fix this issue, ensure that the AC circuit breaker isn’t off and the AC power cable is connected.
8. 2033: Grid Undervoltage
The alarm ID 2033 is a major error code that appears when the grid voltage is under the lower threshold or the low voltage duration lasts longer than the value that LVRT specifies.
Cause ID = 1
This error resolves itself when the alarm occurs accidentally. However, if the error is frequent, the grid voltage might not be within the acceptable range. In this case, you can fix it through the mobile phone app, NMS or SmartLogger.
If the issue persists, ensure that the AC switch connects to the output power cable.
9. 2034: Grid Overvoltage
The alarm ID 2034 is a major error code that appears when the grid voltage is above the higher threshold or the high voltage duration lasts longer than the value that HVRT specifies.
Cause ID = 1
This error resolves on its own when the alarm occurs accidentally. However, if the error is frequent, the grid voltage might not be within the acceptable range. In this case, you can fix it through the mobile phone app, NMS or SmartLogger.
Ensure that the peak voltage of the power grid is not too high and contact your power grid operator if the error persists.
10. 2035: Grid Voltage Imbalance
Error code 2035 is a major issue when the difference between grid phase voltages is higher than the upper threshold.
Cause ID = 1
The inverter automatically recovers when this alarm occurs accidentally. In this situation, the power grid sees a temporary abnormality. However, if the error persists, ensure that the power grid voltage is in the acceptable range.
If not, contact your local power operator. Should the problem continue, check your AC output power cables and contact the power operator if they are well-connected and the alarm persists.
11. 2036: Grid Overfrequency
This error code is a major issue that occurs when the actual grid frequency exceeds the requirement of the local power grid standard.
Cause ID = 1
If the alarm occurs accidentally, the error resolves on its own. However, if the error is frequent, the grid voltage might not be within the acceptable range. In this case, you can fix it through the mobile phone app, NMS or SmartLogger.
Make sure you consult the local power operator before doing this.
12. 2037: Grid Underfrequency
The alarm ID is an error code that occurs when the actual grid frequency is under the requirement of the local power grid standard.
Cause ID = 1
This error can occur accidentally. In this case, the power grid could be temporarily abnormal, and the inverter automatically recovers when everything returns to normal. However, if the alarm is frequent, the grid voltage might not be within the acceptable range.
In this case, you can fix it through the mobile phone app, NMS or SmartLogger. Make sure you consult the local power operator before doing this.
13. 2038: Unstable Grid Frequency
The 2038 error code appears when the actual grid frequency change rate fails to comply with the local power grid standard.
Cause ID = 1
In situations where the alarm triggers accidentally, the error resolves itself. But, if it occurs frequently, the grid voltage might not be within the acceptable range. If that’s not the case, consult your local power operator.
14. 2039: Output Overcurrent
The alarm ID 2039 indicates a significant error when the power grid is short-circuited or the grid voltage drops dramatically, triggering the inverter protection. This error also raises the inverter transient output current above the upper threshold.
Cause ID = 1
The error resolves independently as the inverter can monitor its external working conditions in real-time. If the error is frequent, affecting the PV plant’s power production, ensure that the output is not short-circuited. If the alarm continues, contact Huawei technical support or your dealer.
15. 2040: Output DC Component Overhigh
The major alarm ID 2040 occurs when the DC component in the grid current is higher than the upper threshold.
Cause ID = 1
Since the inverter can monitor its external working conditions in real-time, the error resolves independently. However, if the alarm is frequent, contact Huawei technical support or your dealer to fix the issue.
16. 2051: Abnormal Residual Current
Error code 2051 is a major alarm ID that occurs when the input-to-ground insulation impedance decreases.
Cause ID = 1
The inverter automatically recovers when the external power cable is abnormal temporarily. If the error persists, ensure that the impedance between the PV string and ground doesn’t fall below the threshold.
17. 2061: Abnormal Grounding
The alarm ID 2061 appears when the ground cable or neutral wire is not connected.
Cause ID = 1
To fix this error, turn off the inverter and ensure that the PE cable for the inverter fits appropriately. If your inverter connects to the TN power grid, ensure that the voltage to the ground is normal and the N cable is well connected.
If the AC output connects to an isolation transformer, you need to activate the inverter and disable Grounding inspection via the SmartLogger or NMS app.
18. 2062: Low Insulation Resistance
The alarm ID 2062 is a major error that appears when the PV array is short-circuited to the ground.
Cause ID = 1
To fix this issue, eliminate poor insulation points and short circuits in the impedance between the PV array output and PE. Also, make sure the PE cable for the inverter is well connected.
If the impedance falls below the preset protection threshold in a rainy or cloudy environment, reset the insulation impedance protection threshold via the mobile phone app, NMS or SmartLogger.
19. 2063: Cabinet Over-temperature
The alarm ID 2063 is a minor error that could occur when:
- You install the inverter in a place with poor ventilation,
- The inverter is not working properly, or
- The ambient temperature exceeds the upper threshold.
Cause ID = 1
Make sure the ventilation is stable at the inverter installation position. Also, check the ambient temperature. If the ambient temperature exceeds the upper threshold or the ventilation is poor, adjust the heat dissipation and ventilation.
20. 2064: Device Fault
The major error code 2064 appears when an unrecoverable fault happens on a circuit inside the inverter.
Cause ID = 1–12
To fix it, turn off the DC input switch and AC output switch. Wait for five minutes before turning them back on. Contact Huawei technical support or your dealer if the error continues.
21. 2065: Upgrade Failed or Version Mismatch
This alarm ID appears when the upgrade ends abnormally.
Cause ID = 1, 2 and 4
It is a minor error, and you can fix it by upgrading the inverter again. Contact Huawei technical support or your dealer if the upgrade fails multiple times.
22. 2066: Licence Expired
This warning alarm appears when the privilege certificate enters the grace period.
Cause ID = 1
This alarm means that the Privilege feature has become invalid. To fix it, apply for a new certificate. Once done, load the new certificate.
23. 61440: Faulty Monitoring Unit
This minor alarm ID notifies you when the flash memory has bad sectors or is insufficient.
Cause ID = 1
To fix it, turn off the DC input and the AC output switch and wait five minutes before turning them back on. If the error continues, replace the monitoring board or consult Huawei technical support.
24. 2067: Faulty Power Collector
This alarm ID shows up due to power meter disconnection.
Cause ID = 1
To fix it, ensure that the preset power meter model matches the actual configurations. Check the preset communications parameters and confirm that the power meter is not off and the RS485 communications cable is properly connected.
25. 2072: Transient AC Overvoltage
This error code occurs when the inverter detects that the phase voltage is higher than the transient AC overvoltage protection threshold.
Cause ID = 1
Contact your local power operator if the grid connection voltage exceeds the upper threshold. Once complete, modify the overvoltage protection threshold. Make sure the peak grid voltage is under the upper threshold.
If the error persists, contact Huawei technical support or your dealer to fix it.
Will I Need to Replace My Huawei Inverter?
Yes, you will need to replace your Huawei inverter if the device is faulty. However, it would be best if you replaced the new solar inverter per Huawei’s regulation.
Generally, solar inverters have unique handling and installation requirements. A qualified solar installer can assist you with any required replacements. On the other hand, choosing an unproven installer might render your product warranty void.
How Can I Get a Warranty Replacement for My Huawei Inverter?
Huawei’s warranty replacement process is straightforward. First, the Hotline Team needs to confirm the replacement. Next, you’ll have to follow these steps:
Step 1: Fill out a Faulty Tag form with the details about your faulty inverter and send it to the Hotline Team.
Step 2: You must return the faulty solar inverter within 15 working days after receiving a replacement.
Conclusion
Huawei inverter error codes occur due to several issues you can quickly resolve if you understand the meaning of the displayed alarm ID. Sometimes these Huawei inverter code errors might not point to a significant issue. It could be a minor problem or just a mere warning.
Knowing what each alarm ID stands for will enable you to implement the right solution whenever your inverter is faulty. When your troubleshooting efforts fail, contact your dealer or Huawei Technical Support. They will help you fix the issue, and your solar inverter will be back up and running in no time.
Read more about solar inverters if you enjoyed this article!
