Your Sungrow inverter has stopped producing power, is showing a fault code on the LCD screen, or has triggered an alarm in the iSolarCloud app. Every alarm code corresponds to a specific condition the inverter has detected. Some clear themselves within minutes. Others need a qualified electrician.
Last reviewed: April 2026. Alarm code lists verified against current Sungrow Australia documentation, iSolarCloud app alarm descriptions, and Sungrow Academy troubleshooting guides. Contact PSW Life Support if your code is not listed or the recommended steps do not resolve the issue.
This guide applies to the full Sungrow residential and light commercial range installed in Australia:
- SG-RS – single-phase grid-tied
- SG-RT – three-phase grid-tied
- SH-RS – single-phase hybrid
- SH-RT – three-phase hybrid
- and the legacy SG-D, SG-S, SG-KTL-M, and SH-30 series
Sungrow is one of the most widely installed inverter brands in Australia, and its alarm code library is extensive. The codes vary depending on your model: grid-tied inverters (SG series) use one set, single-phase hybrid inverters (SH-RS) add battery-side codes, and three-phase hybrid inverters (SH-RT) have their own set again. This guide covers all of them.
Contents
Finding your alarm code
- LCD-equipped inverters (SG-RS, SG-RT, SH-RT, SG-D, SG-KTL-M): Press the touch button on the front of the inverter to scroll through the menu screens. The LCD will display the alarm code number and a brief text description when a fault is active. On older models, navigate to the "Error" or "Fault" menu.
- iSolarCloud app (all models): Open the iSolarCloud app on your phone. Navigate to your plant, select the inverter, and check the "Alarm" or "Device Alarms" section. Active and historical alarms are listed with timestamps and code numbers. Set your server region to "AU – Australia" in the app settings.
- iSolarCloud web portal: Log in at isolarcloud.com. Navigate to your plant and click on the device to view alarm history.
- LED-only models (some SG-RS-S variants): Count the number of red LED flashes and match the pattern to the fault table in your installation manual.
Try a restart
Many Sungrow alarm codes resolve with a standard system restart. Before contacting your installer, try this:
- Switch OFF the AC isolator (the Solar Supply Main Switch in your switchboard, or the external AC isolator next to the inverter)
- Switch OFF the DC isolator (the rotary switch on the underside of the inverter, or the external DC isolator on the DC isolator enclosure)
- Wait at least two minutes. The inverter display should go completely blank
- Switch ON the DC isolator first
- Switch ON the AC isolator
- The inverter will run through its start-up checks and should display “Normal” or “Generating” within a few minutes if the fault has cleared
If the code reappears after the restart, note the exact alarm code number and the time it occurred, then look it up below.
Safety notice: Never open the inverter cover or disconnect DC connectors yourself. DC cables from solar panels carry dangerous voltage during daylight hours. All work inside the inverter or on DC wiring is restricted to licensed electricians under Western Australian electrical safety legislation.
Grid & voltage codes
These codes indicate the grid supply at your property is outside the inverter’s permitted operating range. The inverter disconnects to comply with AS 4777.2 protection requirements and restarts automatically when conditions normalise.
In Perth, alarm codes 002 and 014 are the most common Sungrow faults. Grid voltage on the SWIS network rises during high-solar-export periods, particularly in suburbs with high rooftop PV penetration. If you see a voltage alarm around midday that clears by late afternoon, this is a network issue rather than an inverter problem.
| Code | Description | What to do |
|---|---|---|
002 | Grid over-voltage. The grid voltage exceeds the inverter’s upper protection limit | Most common alarm in Perth. Usually caused by high network voltage during peak solar export. The inverter restarts automatically when voltage drops. If persistent, your installer can check the AC wiring gauge and length, adjust the volt-watt response settings, or request a Western Power network voltage assessment |
003 | Transient over-voltage. A temporary voltage spike exceeding the inverter’s limit | Automatic. The inverter recovers once the grid stabilises. If frequent, contact your installer to check for a nearby surge source or grid instability |
004 | Grid under-voltage. The grid voltage is below the inverter’s lower protection limit | Check for a grid outage or tripped breakers. If the grid is live and the code persists, contact your installer to check AC connections |
005 | Transient under-voltage. A temporary voltage dip below the permitted minimum | Automatic. Usually caused by a short-term grid disturbance. If frequent, contact your installer |
006 | AC over-current. The AC output current exceeds the inverter’s rated limit | The inverter will resume once current drops below the protection value. If persistent, contact your installer to check AC wiring and connections |
007 | Transient AC over-current | Automatic. The inverter will self-recover. If frequent, contact your installer |
008 | Grid over-frequency. The grid frequency exceeds the protection limit | Automatic. Rare in WA. If persistent, contact your installer to verify protection parameter settings |
009 | Grid under-frequency. The grid frequency is below the protection limit | Automatic. Rare in WA. If persistent, contact your installer |
010 | Islanding detected. The inverter has lost its connection to the grid | The most common Sungrow alarm overall. Check your switchboard for tripped breakers. Confirm whether there is an area outage on the Western Power outage map. Check that the Solar Supply Main Switch and inverter AC isolator are both turned on. If the grid is available and this code persists, check whether the AC cable is firmly connected and whether live and neutral are correctly wired |
014 | Grid voltage out of range (10-minute average). The average grid voltage has exceeded the permitted limit for an extended period | Similar to 002 but based on a sustained average rather than an instantaneous reading. Common in Perth during extended periods of high solar export. Your installer can adjust the volt-watt response settings or request a Western Power network assessment |
015 | Grid voltage out of range (10-minute average, under-voltage variant) | Sustained low average grid voltage. Check for a partial grid fault. If persistent, contact your installer |
019 | Transient grid frequency deviation | Automatic. Short-term frequency disturbance. If frequent, contact your installer |
DC, insulation, and PV array codes
These codes relate to the DC side of the system: solar panels, DC wiring, and the connection to the inverter. Insulation faults are the most common DC-side issue and are often caused by moisture.
| Code | Description | What to do |
|---|---|---|
039 | Insulation resistance too low (ISO fault). The insulation between the PV array and earth has dropped below the minimum threshold | Contact your installer. Do not restart without professional inspection. Common causes: moisture in a rooftop DC isolator or MC4 connector, damaged cable insulation, or a panel junction box fault. More common after rain. If it clears in dry weather but returns after rain, there is a water ingress point that needs to be found and sealed. Your installer should check whether the ISO resistance protection value is set appropriately for local regulations via the app or LCD |
012 | Leakage current fault. Current is leaking to earth through the PV array or wiring | Contact your installer. This can be caused by a damp environment (the inverter may reconnect when conditions improve), or by damaged insulation on AC or DC cables. If the environment is normal and cables are intact, contact Sungrow |
021 | DC bus over-voltage. The internal DC bus voltage has exceeded the safe limit | Restart. If persistent, contact your installer |
022 | High PV input voltage. The DC voltage from the solar panels exceeds the inverter’s maximum input limit | Contact your installer immediately. This should not occur in a correctly designed system. Do not restart without professional inspection |
088 | Arc fault detected (AFD/AFCI). The inverter has detected a potential arc in the DC wiring | ⚠️ Potential fire risk. Contact your installer immediately. Check whether any DC cable is damaged, any connection terminal or fuse is loose, or any component is burnt. After inspection, reconnect DC power and clear the AFD fault via the LCD or iSolarCloud app. The inverter will not restart until the fault is manually cleared |
036 | Radiator temperature too high. The inverter’s heatsink has exceeded the safe temperature limit | Check ventilation around the inverter. Clear debris, spider webs, or vegetation within 300mm of the heatsink fins. Check for alarm 070 (fan fault) in the app. In Perth, common on 40°C+ days, particularly for inverters in direct afternoon sun. Consider a shade hood if this occurs regularly |
037 | Ambient temperature too high | Same as 036. The environment around the inverter is too hot. Improve ventilation or add shading |
070 | Fan anomaly. The cooling fan is not operating correctly | The inverter can continue running but may derate. Check whether the fan is physically obstructed. If clear and the alarm persists, the fan may need replacement. Contact your installer |
040 | DC injection too high | Restart. If persistent, contact your installer. Check whether the AC cable is correctly connected and whether insulation between the ground cable and the live wire is normal |
548–563 | PV string abnormal (string 1–16 respectively). Low or zero output from a specific string | Check whether the affected string’s panels are shaded, dirty, or sheltered. Check for abnormal ageing on older panels. If the panels are clean and unshaded, contact your installer to check the string wiring |
Hardware & internal codes
These codes indicate a fault within the inverter itself. Always try a full restart first. If the code returns, professional service is required.
| Code | Description | What to do |
|---|---|---|
025 | Internal hardware fault | Restart. If persistent, contact Sungrow or your installer. The inverter may need replacement under warranty |
041 | Relay check failure. The internal relay self-test has failed | Restart. If persistent, the relay may need replacement. Contact your installer |
046 | EEPROM read/write failure. Internal memory fault | Restart. If persistent, contact your installer. The control board may need replacement |
035 | Internal communication failure | Restart. If persistent, contact your installer |
042 | DSP/ARM communication failure | Restart. If persistent, the inverter likely needs a firmware update or hardware service. Contact Sungrow |
Communication & meter codes
These codes relate to the communication between the inverter and external devices: the energy meter, WiFi module, and iSolarCloud platform. Communication alarms do not stop the inverter from generating power, but they can affect export limiting, monitoring, and battery control.
| Code | Description | What to do |
|---|---|---|
514 | Meter communication abnormal. The inverter has lost communication with the Smart Energy Meter | Check whether the RS485 communication cable between the inverter and meter is securely connected. Check whether the meter’s power cable connections are correct. Check whether the cable direction (input/output) is correct. If the existing system is multi-inverter, check whether the rated power setting of each inverter is correct. If persistent, contact your installer. Note: without meter communication, the inverter cannot limit export or manage battery charging based on household consumption |
515 | WiFi module communication failure | The inverter has lost communication with the WiFi dongle. Check the dongle is firmly plugged in. Try pressing the button on the dongle three times to reset it. See the Sungrow WiFi reconnection guide for detailed steps. The inverter continues to generate power; only monitoring is affected |
Battery & BMS alarm codes
SH-RS, SH-RT, SH-30 hybrid inverters
If you have a Sungrow hybrid inverter with a connected battery (SBR, SBH, or compatible third-party battery), you may see additional alarm codes in the 7xx, 8xx, and 9xx range. These relate to the battery management system (BMS), battery voltage, temperature, and charging/discharging behaviour.
Battery alarms are split into two severity levels: Alarm codes (9xx range) are warnings that the battery can usually recover from automatically. Fault codes (7xx and 8xx range) are more serious and may require professional service.
| Code | Description | What to do |
|---|---|---|
714 | BMS communication fault. The inverter has lost communication with the battery management system | The most common battery alarm. Check the RJ45 communication cable between the inverter and battery. Verify the first two pins (CAN H and CAN L) are correctly connected. Try replacing the cable with a new CAT5 cable. If the cable is secure and the alarm persists, check whether BMS communication voltage is between 3.3V and 5.0V (licensed electrician only). If voltage is absent, the BMS or inverter communication port may need replacement. Contact PSW Life Support |
703 | Low average battery voltage. The battery voltage has dropped below the minimum operating threshold | Contact your installer. The battery may have been deeply discharged or there may be a cell imbalance. Measure the voltage of each battery module to check for imbalance (greater than 0.5V difference indicates a problem) |
707 | Battery over-temperature | Check ventilation around the battery. Ensure nothing is blocking airflow. If installed in a non-ventilated space or in direct sunlight, the installation may need modification. Contact your installer |
708 | Battery low temperature | Rare in Perth. Most lithium batteries will not charge or discharge below 0°C to 5°C. The battery will resume operation when it warms up |
711 | Battery transient overvoltage | Contact your installer. Check module voltages for imbalance. If modules are balanced, the battery or BMS may need service |
715 | Battery hardware overvoltage | Contact your installer. This is a hardware-level protection trigger |
717 | BMS and battery fault. Combined communication and hardware issue | Contact your installer or Sungrow support |
832 | FET fault / battery switch fault | Contact Sungrow support. The battery’s internal switching hardware has faulted |
833 | Battery internal hardware fault | Contact Sungrow support. The battery needs service or replacement |
835 | Battery short-circuit fault | ⚠️ Contact Sungrow support immediately. Do not restart without professional inspection |
836 | Battery internal communication failure | Contact Sungrow support |
933 | Battery over-temperature alarm (warning level) | The battery is running hot but has not reached the fault threshold. Improve ventilation. Monitor the alarm; if it escalates to a 7xx fault, contact your installer |
934 | Battery low temperature alarm (warning level) | Rare in Perth. The battery will self-recover when ambient temperature rises |
937 | Battery pack voltage unbalance | One or more battery modules have a different voltage from the others. Contact your installer to measure individual module voltages |
964 | BMS internal alarm | Contact Sungrow support. The BMS has detected an internal anomaly |
Backup-specific alarms
SH-RS, SH-RT hybrid inverters with backup
If your hybrid inverter has a backup circuit connected, you may see these additional alarms during grid outages or backup operation.
| Code / description | What to do |
|---|---|
Backup overload | The load on your backup circuit exceeds the inverter’s backup output capacity. Reduce the load by turning off high-draw appliances (air conditioners, heaters, kettles, pool pumps). The SH-RT supports “100% unbalanced loads” across three phases, but total load per phase must still be within the rated backup capacity |
System alarm: anomaly during storm/outage | The inverter detected an anomaly during a grid transition event. This can result in a brief loss of backup power (typically up to one minute) while the inverter restarts and re-enters backup mode. This is a known behaviour with the ATS (automatic transfer switch) restart sequence. If backup power is lost for longer than two minutes, contact your installer |
LED status indicators
If you cannot read an alarm code on the LCD, the LED indicators on the front of the inverter provide a quick status check.
| LED | State | Meaning |
|---|---|---|
Green | Solid on | Normal operation. The inverter is generating power |
Green | Flashing | The inverter is in standby or start-up mode. Normal at dawn and dusk when there is insufficient sunlight |
Green | Off | No generation. The inverter is either in night mode, shut down, or in a fault state |
Red | Solid or flashing | A fault has occurred. Check the LCD or iSolarCloud app for the alarm code |
All LEDs off | — | No power to the inverter. Check that the AC isolator, DC isolator, and any external switches are in the ON position |
Codes needing professional attention
Most Sungrow alarm codes are either temporary (grid-related) or can be resolved with a restart. The following codes require prompt action from a qualified electrician. Do not attempt a restart without professional advice if you see any of these:
- 039 (Insulation resistance too low): Earth insulation breakdown. Possible electrical safety risk in the DC wiring or panels
- 012 (Leakage current fault): Earth leakage current detected
- 088 (Arc fault detected): Potential fire risk in DC wiring. Do not restart until the fault is manually cleared after inspection
- 022 (High PV input voltage): DC voltage exceeds the inverter's maximum. Possible string design error
- 041 (Relay check failure, persistent after restart): The inverter cannot confirm its isolation relay is functioning
PSW customers: For any code in this list, contact PSW Life Support. All other customers should call their original installer.
Sungrow WiFi and monitoring issues
If your iSolarCloud app shows no data or your inverter appears offline, the inverter has usually just lost its WiFi connection. The solar system continues to generate power normally; you just cannot see the data.
PSW has a dedicated step-by-step guide for reconnecting your Sungrow inverter. See the Sungrow WiFi reconnection guide for instructions.
Quick tips:
- Press the WiFi dongle button three times to reset the connection
- In the iSolarCloud app, go to Support → Local Access to reconfigure the WiFi connection
- The default local password is “pw1111” (unless changed by your installer)
- Sungrow WiFi dongles operate on 2.4GHz only. If your router combines 2.4GHz and 5GHz under one network name and the connection fails, try temporarily splitting the bands or creating a dedicated 2.4GHz SSID
- Set the server region to “AU – Australia” in the app settings
Keeping Sungrow firmware current
Sungrow releases firmware updates that improve grid compliance, fix bugs, and add features. Keeping firmware current can prevent or resolve many alarm codes.
RS and RT series: Your installer can update firmware via the iSolarCloud app during a site visit. Some updates can be pushed remotely by Sungrow if the inverter is online.
Legacy SG-D and SG-KTL-M series: Firmware updates typically require a site visit with a USB dongle or direct connection.
If your inverter is not connected to the internet, it cannot receive update notifications or remote updates. PSW recommends connecting your inverter to your home WiFi to enable remote monitoring, firmware updates, and fault notifications.
Frequent questions
My inverter shows alarm code 002 or 014 every day around midday. Is it broken?
No. These are the most common Sungrow alarms in Perth. Under AS 4777.2:2020, your inverter must disconnect when grid voltage exceeds the permitted threshold.
This is common in suburbs with high rooftop solar penetration, where many systems export simultaneously and push local network voltage up. The inverter restarts automatically when voltage drops. If this is significantly reducing your generation, your installer can adjust the volt-watt response settings or request a Western Power network voltage assessment.
What does alarm code 010 mean?
Alarm 010 is “Islanding” — the inverter has lost its grid connection. This is the most common Sungrow alarm code overall. Check your switchboard breakers, confirm there is no area outage on the Western Power outage map, and verify that the Solar Supply Main Switch and inverter AC isolator are both on.
If the grid is live and the alarm persists, the AC wiring between the inverter and the switchboard may be faulty. Contact your installer.
My hybrid inverter shows alarm 714 (BMS communication fault). Is my battery damaged?
Not necessarily. This is the most common battery-related alarm and is usually a communication cable issue rather than a battery fault.
Check the RJ45 cable between the inverter and battery first. Try replacing it with a new CAT5 cable. If the alarm persists after a cable swap, the BMS or inverter communication port may need attention. PSW customers should contact PSW Life Support.
The iSolarCloud app shows my inverter as offline but the green LED is on. What is happening?
Your inverter has lost its internet connection but is still generating power normally. Follow the Sungrow WiFi reconnection guide to restore monitoring. Remember to press the WiFi dongle button three times to reset the connection.
I have an alarm code not listed here. What should I do?
PSW customers should contact PSW Life Support with the alarm code number, your inverter model and serial number, and the approximate time the alarm appeared. We service Sungrow inverters across Perth and can diagnose many issues remotely through iSolarCloud.
What warranty does my Sungrow inverter have?
Sungrow residential inverters installed in Australia typically carry a 10-year product warranty. Some models and promotions may offer extended warranty periods. Check your warranty documentation, or PSW customers should contact PSW Life Support to verify their coverage.
References
- Sungrow: iSolarCloud portal and app
Sungrow Academy: SBR battery communication fault troubleshooting (Code 714)
Sungrow Academy: Battery fault codes 703-739 troubleshooting
AS 4777.2:2020: Grid connection of energy systems via inverters (Part 2: Inverter requirements)
Western Power: Technical Rules and Metering Code
This guide is current as at April 2026. Sungrow firmware updates may introduce new alarm codes or modify existing behaviour. PSW customers should contact PSW Life Support for the latest information.
