Sungrow Inverter Fault Codes
Sungrow Inverter Fault Codes
Sungrow Inverter Fault Codes
If your Sungrow inverter is displaying a fault message or has stopped working, it’s likely showing one of many built-in Sungrow inverter error codes. These alerts are designed to protect your system from electrical faults, grid issues, and internal hardware problems—but without the right context, they can be difficult to interpret.
Whether you're seeing code 002 (Grid Overvoltage), 088 (Arc Fault on PV Side), or 036 (Radiator Temperature Too High), this guide will help you understand the cause and how to resolve it. Some issues may be minor and self-correcting, while others—like leakage current faults, insulation failures, or bus overvoltage errors—require immediate professional attention.
We’ve compiled a full list of Sungrow inverter error codes along with detailed explanations and solutions to help you get your solar system back online safely. If you're unsure or need expert help, Solair Electrical is here to assist. Call us on 0405 685 441 to book a professional Sungrow inverter inspection anywhere in Brisbane or the Gold Coast.
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Sungrow Error Code 002: Grid Over-Voltage
Description:
The grid voltage has surpassed the inverter's allowable upper limit.
Troubleshooting Steps:
- Measure the grid voltage:
Ensure it aligns with the inverter's permissible range. - Contact your utility provider:
If the voltage is outside the acceptable range, seek assistance from your utility company. - Seek professional assistance:
If the voltage is within range but the error persists, consult a qualified technician.
Sungrow Error Code 003: Transient Over-Voltage
Description:
A temporary surge in grid voltage exceeding the inverter's limit.
Troubleshooting Steps:
- Wait for automatic recovery:
The inverter typically resets once the grid stabilizes. - Consult a professional:
If the error continues, seek assistance from a qualified technician.
Sungrow Error Code 004: Grid Under-Voltage
Description:
The grid voltage has dropped below the inverter's allowable lower limit.
Troubleshooting Steps:
- Measure the grid voltage:
Confirm it falls within the inverter's permissible range. - Contact your utility provider:
If the voltage is below the acceptable range, seek assistance from your utility company. - Seek professional assistance:
If the voltage is within range but the error persists, consult a qualified technician.
Sungrow Error Code 005: Grid Under-Voltage (Stage II)
Description:
A more severe drop in grid voltage than Error 004.
Troubleshooting Steps:
- Wait for automatic recovery:
The inverter may reset once the grid voltage stabilizes. - Consult a professional:
If the error persists, seek assistance from a qualified technician.
Sungrow Error Code 006: AC Over-Current
Description:
The AC output current has exceeded the inverter's allowable limit.
Troubleshooting Steps:
- Allow for automatic recovery:
The inverter should reset once the current returns to acceptable levels. - Seek professional assistance:
If the error continues, consult a qualified technician.
Sungrow Error Code 007: Transient AC Over-Current
Description:
A temporary surge in AC output current beyond the inverter's limit.
Troubleshooting Steps:
- Wait for automatic recovery:
The inverter typically resets after a brief period. - Consult a professional:
If the error persists, seek assistance from a qualified technician.
Sungrow Error Code 008: Grid Over-Frequency
Description:
The grid frequency has exceeded the inverter's allowable upper limit.I
Troubleshooting Steps:
- Measure the grid frequency:
Ensure it aligns with the inverter's permissible range. - Contact your utility provider:
If the frequency is outside the acceptable range, seek assistance from your utility company. - Seek professional assistance:
If the frequency is within range but the error persists, consult a qualified technician.
Sungrow Error Code 009: Grid Under-Frequency
Description:
The grid frequency has dropped below the inverter's allowable lower limit.
Troubleshooting Steps:
- Measure the grid frequency:
Confirm it falls within the inverter's permissible range. - Contact your utility provider:
If the frequency is below the acceptable range, seek assistance from your utility company. - Seek professional assistance:
If the frequency is within range but the error persists, consult a qualified technician.
Sungrow Error Code 010: Grid Failure (Islanding)
Description:
The inverter has detected a loss of grid connection, a condition known as islanding.
Troubleshooting Steps:
- Inspect the AC circuit breaker:
Ensure it hasn't tripped and is functioning correctly. - Verify AC cable connections:
Confirm all AC cables are securely connected. - Check grid status:
Determine if there's a power outage or grid maintenance. - Consult a professional:
If all connections are secure and the grid is operational, but the error persists, seek assistance from a qualified technician.
Sungrow Error Code 011: DC Injection Over-Current
Description:
The DC component of the AC current has exceeded the inverter's allowable limit.
Troubleshooting Steps:
- Wait for automatic recovery:
The inverter may reset once the current stabilizes. - Consult a professional:
If the error continues, seek assistance from a qualified technician.
Sungrow Error Code 012: Leakage Current Over-Current
Description:
The leakage current has surpassed the inverter's allowable upper limit.
Troubleshooting Steps:
- Inspect PV strings for ground faults:
Ensure there's no unintended grounding in the PV system. - Seek professional assistance:
If the error persists, consult a qualified technician.
Sungrow Error Code 015: Grid Over-Voltage (Stage II)
Description:
The grid voltage has exceeded the inverter's allowable upper limit, surpassing the threshold set for Error 002.
Troubleshooting Steps:
- Inspect AC cables:
Ensure the AC cables are of the correct specifications and properly connected. - Monitor grid voltage:
If the grid voltage exceeds permissible limits, contact your utility provider for assistance. - Seek professional assistance:
If the error persists despite normal grid conditions, consult a qualified technician.
Sungrow Error Code 016: Bus Voltage or Power High
Description:
The bus voltage or power has risen above the inverter's allowable limit.
Troubleshooting Steps:
- Wait for automatic recovery:
The inverter may reset once the internal conditions stabilize. - Consult a professional:
If the fault recurs, seek assistance from a qualified technician.
Sungrow Error Code 019: Bus Transient Over-Voltage
Description:
A sudden surge in bus voltage has exceeded the inverter's allowable limit.
Troubleshooting Steps:
- Wait for automatic recovery:
The inverter may reset after the transient condition subsides. - Seek professional assistance:
If the error continues, consult a qualified technician.
Sungrow Error Code 020: Bus Over-Voltage
Description:
The bus voltage has consistently exceeded the inverter's allowable upper limit.
Troubleshooting Steps:
- Wait for automatic recovery:
The inverter may reset once the voltage returns to normal levels. - Consult a professional:
If the fault persists, seek assistance from a qualified technician.
Sungrow Error Code 021: PV1 Input Over-Current
Description:
The current from the PV1 input has surpassed the inverter's allowable limit.
Troubleshooting Steps:
- Inspect PV1 wiring:
Ensure the PV1 input's wiring and configuration adhere to the inverter's specifications. - Seek professional assistance:
If the error remains unresolved, consult a qualified technician.
Sungrow Error Code 022: PV2 Input Over-Current
Description:
The current from the PV2 input has exceeded the inverter's allowable limit.
Troubleshooting Steps:
- Inspect PV2 wiring:
Ensure the PV2 input's wiring and configuration adhere to the inverter's specifications. - Seek professional assistance:
If the error persists, consult a qualified technician.
Sungrow Error Code 028: PV1 Reverse Connection
Description:
The PV1 input has been connected with reversed polarity.
Troubleshooting Steps:
- Check PV1 connections:
Verify that the PV1 input cables are correctly connected with proper polarity. - Consult a professional:
If unsure about the connections, seek assistance from a qualified technician.
Sungrow Error Code 029: PV2 Reverse Connection
Description:
The PV2 input has been connected with reversed polarity.
Troubleshooting Steps:
- Check PV2 connections:
Ensure the PV2 input cables are correctly connected with proper polarity. - Seek professional assistance:
If the error remains, consult a qualified technician.
Sungrow Error Code 036: Radiator Over-Temperature
Description:
The radiator's temperature has exceeded safe operating limits.
Troubleshooting Steps:
- Assess ambient conditions:
Ensure the inverter is installed in a well-ventilated area, away from direct sunlight. - Inspect cooling systems:
Check for any obstructions or malfunctions in the inverter's cooling mechanisms. - Seek professional assistance:
If the issue persists, consult a qualified technician.
Sungrow Error Code 037: Internal Over-Temperature
Description:
The internal temperature of the inverter has surpassed allowable limits.
Troubleshooting Steps:
- Evaluate installation environment:
Confirm that the inverter is in a location with adequate ventilation and is not exposed to external heat sources. - Inspect for obstructions:
Ensure that air inlets and outlets are free from blockages. - Consult a professional:
If the fault continues, seek assistance from a qualified technician.
Sungrow Error Code 038: Grid-Side Relay Fault
Description:
An anomaly has been detected in the relay on the grid side of the inverter.
Troubleshooting Steps:
- Wait for automatic recovery:
The inverter may attempt to reset the relay automatically. - Seek professional assistance:
If the error persists, consult a qualified technician to inspect and possibly replace the faulty relay.
Sungrow Error Code 039: Low Insulation Resistance (ISO-Flt)
Description:
The insulation resistance between the PV system and the earth is below the acceptable threshold.
Troubleshooting Steps:
- Inspect grounding connections:
Ensure that the inverter and PV system have reliable grounding. - Check for ground faults:
Examine the PV strings for any signs of short-circuits to the ground. - Seek professional assistance:
If the issue remains unresolved, consult a qualified technician.
Sungrow Error Code 041: Leakage Current Sampling Fault
Description:
This error indicates an abnormality in the inverter's ability to accurately sample leakage current, which is crucial for ensuring electrical safety.
Troubleshooting Steps:
- Allow for Automatic Recovery:
Sometimes, the inverter can self-correct this issue. Wait a few moments to see if the error resolves on its own. - Seek Professional Assistance:
If the fault persists, it's essential to contact a qualified technician to inspect and address the issue.
Sungrow Error Code 043: Inner Under-Temperature Fault
Description:
The internal temperature of the inverter has dropped below the operational threshold, potentially affecting performance.
Troubleshooting Steps:
- Monitor Ambient Temperature:
Ensure that the surrounding environment isn't excessively cold. The inverter typically operates optimally above -25°C. - Wait for Temperature Normalization:
As the ambient temperature rises, the inverter should return to normal operation. - Consult a Professional:
If the inverter doesn't resume normal function as temperatures increase, seek assistance from a qualified technician.
Sungrow Error Code 044: Inverter Self-Test Fault
Description:
The inverter has encountered an issue during its internal self-diagnostic test, indicating potential internal malfunctions.
Troubleshooting Steps:
- Allow for Automatic Recovery:
The inverter may attempt to rectify the issue on its own. Wait a few moments to see if it resumes normal operation. - Seek Professional Assistance:
If the fault persists, it's crucial to contact a qualified technician to diagnose and address the underlying problem.
Sungrow Error Code 045: PV1 Boost Circuit Fault
Description:
An anomaly has been detected in the boost circuit associated with the PV1 input, which can affect energy conversion efficiency.
Troubleshooting Steps:
- Wait for Automatic Recovery:
The inverter might attempt to resolve the issue internally. Allow some time to see if the error clears. - Consult a Professional:
If the error remains, seek assistance from a qualified technician to inspect and repair the boost circuit.
Sungrow Error Code 046: PV2 Boost Circuit Fault
Description:
Similar to Error 045, this indicates a problem with the boost circuit, but specifically related to the PV2 input.
Troubleshooting Steps:
- Wait for Automatic Recovery:
Give the inverter some time to see if it can self-correct the issue. - Seek Professional Assistance:
If the fault persists, contact a qualified technician to inspect and address the problem.
Sungrow Error Code 048: Phase Current Sampling Fault
Description:
The inverter has detected inconsistencies in sampling the phase current, which can impact its synchronization with the grid.
Troubleshooting Steps:
- Allow for Automatic Recovery:
The inverter may attempt to rectify the sampling issue on its own. Wait a few moments to observe if normal operation resumes. - Consult a Professional:
Persistent errors necessitate contacting a qualified technician to diagnose and correct the sampling fault.
Sungrow Error Code 053: Grid Voltage Detection by Slave DSP
Description:
The slave Digital Signal Processor (DSP) has identified that the grid voltage exceeds the inverter's allowable upper limit.
Troubleshooting Steps:
- Check Grid Voltage:
Measure the grid voltage to determine if it aligns with the inverter's operational parameters. - Coordinate with Utility Provider:
If the grid voltage is outside permissible limits, contact your utility company to address the issue. - Seek Professional Assistance:
If the grid voltage is within range but the error persists, consult a qualified technician for further diagnosis.
Sungrow Error Code 054: Grid Frequency Detection by Slave DSP
Description:
The slave DSP has detected that the grid frequency is beyond the inverter's allowable range.
Troubleshooting Steps:
- Measure Grid Frequency:
Use appropriate tools to verify the current grid frequency. - Engage with Utility Provider:
If the frequency is outside acceptable parameters, liaise with your utility company for resolution. - Consult a Professional:
Should the frequency be normal yet the error remains, seek assistance from a qualified technician.
Sungrow Error Code 056: Leakage Current Detection by Slave DSP
Description:
The slave DSP has identified that the leakage current surpasses the inverter's safety thresholds.
Troubleshooting Steps:
- Inspect PV Strings:
Examine the photovoltaic strings for any ground faults or insulation issues. - Seek Professional Assistance:
If no apparent issues are found or the error persists, contact a qualified technician for a comprehensive assessment.
Sungrow Error Code 059: Communication Alarm Between Master and Slave DSP
Description:
There is a communication breakdown between the master and slave DSPs within the inverter, potentially affecting coordinated operations.
Troubleshooting Steps:
- Wait for Automatic Recovery:
The inverter may attempt to re-establish communication internally. Allow a minute to see if normal function resumes. - Consult a Professional:
Persistent communication issues require the expertise of a qualified technician to diagnose and rectify.
Sungrow Error Code 070: Fan Defective
Description:
This error indicates that the inverter's cooling fan is malfunctioning, which can lead to overheating and reduced efficiency.
Troubleshooting Steps:
- Power Down the Inverter:
Safely shut down the inverter by following the manufacturer's shutdown procedure. - Disconnect Power Sources:
Ensure both AC and DC power sources are disconnected to prevent electrical hazards. - Inspect the Fan Duct:
Check for any obstructions, debris, or blockages in the fan duct that might impede airflow. - Replace the Fan if Necessary:
If no blockages are found and the fan remains non-functional, it may require replacement. - Seek Professional Assistance:
If you're unsure about performing these steps or if the problem persists after replacing the fan, contact a qualified technician for further assistance.
Sungrow Error Code 084: Reverse Cable Connection Warning
Description:
This warning signifies that there is a reverse connection detected in the power cables, which can affect the inverter's performance and safety.
Troubleshooting Steps:
- Verify Power Cable Connections:
Ensure that all power cables are connected correctly according to the inverter's installation guidelines. - Check Inverter Settings:
If the "Existing Inverter" setting is enabled via the LCD menu, confirm that its rated power is accurately configured. - Inspect CT Clamp Placement:
For single-phase meters, ensure that the Current Transformer (CT) clamp is correctly positioned and oriented as per the manufacturer's instructions. - Consult a Professional:
If the warning persists after performing these checks, seek assistance from a qualified technician to inspect and rectify the issue.
Sungrow Error Code 085: Mismatched Software Version
Description:
This error indicates that the inverter's software version is incompatible or not matching the required specifications, which can lead to operational issues.
Troubleshooting Steps:
- Identify the Current Software Version:
Access the inverter's system information to determine the installed software version. - Consult Manufacturer's Resources:
Refer to the manufacturer's official website or user manual to verify the correct software version required for your inverter model. - Update the Software if Necessary:
If an update is available and you're comfortable performing the update, proceed according to the manufacturer's instructions. - Seek Professional Assistance:
If you're unsure about updating the software or if the error persists after the update, contact a qualified technician or the manufacturer's service department for further guidance.
Sungrow Error Code 087: Arc Detection Module Abnormal Alarm
Description:
This alarm indicates an abnormality in the arc detection module, which is responsible for identifying electrical arcs that could pose safety risks.
Troubleshooting Steps:
- Wait for Automatic Recovery:
In some cases, the inverter may attempt to self-recover from this alarm. Allow a few moments to see if the error clears. - Consult a Professional:
If the alarm persists, it's crucial to contact a qualified technician to inspect the arc detection module and address any underlying issues.
Sungrow Error Code 088: Arc Fault on PV Side
Description:
This error signifies that an arc fault has been detected on the photovoltaic (PV) side of the system, which can be a serious safety concern.
Troubleshooting Steps:
- Power Down the Inverter:
Safely shut down the inverter following the manufacturer's recommended procedure. - Inspect PV Wiring and Components:
Examine all PV wiring, connectors, and components for signs of damage, wear, or loose connections. - Address Identified Issues:
If any damaged or faulty components are found, repair or replace them as necessary. - Restart the Inverter:
After ensuring all issues are addressed, power the inverter back on and monitor for any recurrence of the error. - Seek Professional Assistance:
If the error persists or if you're uncertain about performing these steps, contact a qualified technician for a comprehensive inspection and resolution.
Sungrow Error Code 089: Arc Detection Function Disabled
Description:
This warning indicates that the arc detection function has been disabled, either intentionally or due to a system fault, which can compromise safety monitoring.
Troubleshooting Steps:
- Enable Arc Detection Function:
Access the inverter's settings via the LCD menu or associated application to ensure that the arc detection function is enabled. - Consult the User Manual:
Refer to the inverter user manual for specific instructions on enabling and configuring the arc detection function. - Seek Professional Assistance:
If you're unable to enable the function or if the warning persists after enabling, contact a qualified technician to investigate and resolve the issue.
Need Help With a Sungrow Inverter Fault? Call Solair Electrical Today
Interpreting Sungrow inverter fault codes is only the first step—accurately diagnosing and resolving them requires technical experience and proper testing equipment. At Solair Electrical, we specialise in fault finding and repairs for all major Sungrow inverter models, including the SG series, SH hybrid inverters, and older legacy units.
Whether your system is experiencing grid frequency errors, insulation faults, communication problems, or arc detection shutdowns, we’ll get to the root of the issue and restore your system’s performance—fast.
Call Solair Electrical now on 0405 685 441 to book an expert inspection and get your solar inverter running efficiently again. We service all of Greater Brisbane, the Redlands, Logan, and the Gold Coast.