SMA Inverter Event Codes Australia: Troubleshooting Sunny Boy and Sunny Tripower Faults
Updated 9 September 2026 · By SolarNevs Research Desk, Dealer surveys + verified sources · 1 source · Method ↗
Key Takeaways
- SMA inverters, including Sunny Boy and Sunny Tripower models, use a consistent event code system to indicate operational status or faults.
- Many common codes, such as those related to high grid voltage (101–105) or low DC input (3301–3303), are often temporary and resolve automatically.
- Codes indicating insulation failure (3501, 3503), residual current (3701), or arc faults (8206) are safety-critical and require immediate professional attention.
- While you can check your inverter's display or app and perform basic checks like circuit breakers, any work involving DC wiring, grid protection settings, or opening the inverter enclosure requires a CEC-accredited installer.
Understanding SMA Inverter Event Codes
SMA inverters, including the single-phase Sunny Boy series and three-phase Sunny Tripower series, use a system of event codes to communicate their operational status. These codes can appear on the inverter's LCD screen (for older models like SB-TL and STP-TL) or be accessed via the SMA Energy app or Sunny Portal (for newer models like the SBS series). While specific codes may only apply to certain models, the overall numbering system is consistent across SMA's residential and light commercial range in Australia.
What is actually going on
When your SMA inverter displays an event code, it's indicating that a specific condition has been detected. This could be a normal operational message, a warning that might affect performance, or an error that requires the inverter to stop feeding power into the grid for safety.
SMA event codes are broadly categorised by number range:
- Grid and AC Event Codes (101–1501): These relate to the connection with the electricity grid, including voltage, frequency, and wiring issues.
- DC, Insulation, and PV Array Event Codes (3301–3802): These codes indicate issues with the solar panels, DC wiring, or insulation integrity.
- Hardware and Internal Event Codes (6002–7102): These point to internal inverter conditions, such as temperature, self-diagnosis errors, or parameter file issues.
- Communication and System Management Event Codes (8003–8710): These cover problems with internet connectivity, monitoring, or communication with external system controllers.
An Australian installer compilation from PSW Energy notes that "Event codes are consistent across SMA’s product range, though some codes only apply to specific models."
The code table
The following table, compiled from an Australian installer's experience (PSW Energy), outlines common SMA event codes you might encounter, their meanings, and initial steps you can take.
Code | What it means | What to do |
|---|---|---|
101–105 | Grid voltage too high | The grid voltage or impedance at the connection point exceeds the permitted limit. This is common in areas with high solar penetration, such as Perth. The inverter disconnects and waits for voltage to normalise. If persistent, a CEC-accredited installer can check AC wiring, verify country settings, or request a network voltage assessment. |
202–206 | Grid disconnection / utility grid not available | The grid has been disconnected, the AC cable is damaged, or the grid voltage is too low. Check your main switchboard for tripped circuit breakers and confirm there is no area-wide power outage. Ensure the AC cable to the inverter is not visibly damaged. If persistent, contact a CEC-accredited installer. |
301 | Grid fault (ten-minute average of grid voltage outside permitted range) | The ten-minute average of the grid voltage is no longer within the permitted range. Similar to codes 101–105 but based on a sustained average. This is common in Perth during extended peak solar periods. If persistent, a CEC-accredited installer should investigate AC wiring or request a network assessment. |
401–404 | Grid disconnect due to frequency change | The inverter has stopped feed-in due to grid frequency fluctuations. This is usually an automatic response, and the inverter restarts when frequency stabilises. It is rare in Western Australia. If persistent, contact a CEC-accredited installer. |
501 | Grid frequency outside the permitted range | The grid frequency is outside the permitted range. This is an automatic response. If persistent, contact a CEC-accredited installer to verify protection parameter settings are appropriate for Australia. |
601 | Excessive DC in grid current | The inverter’s monitoring has detected too much direct current in the AC output. This may indicate an insulation or measurement fault. If persistent, contact a CEC-accredited installer. |
701 | Frequency not permitted | The grid power frequency is outside the permissible range set for the inverter. This is an automatic response if transient. If persistent, a CEC-accredited installer should verify country/frequency settings. |
801 | Waiting for grid voltage | The inverter understands there has been a grid failure (power outage). Check your main switchboard breakers and confirm if there is an area power outage. The inverter restarts automatically once grid supply returns and the mandatory reconnection timer expires. |
1001 | L and N connection swap | The active and neutral connections at the inverter are reversed. This is a wiring fault that needs correction by a CEC-accredited installer. |
1302 | L and N not connected | The AC connection to the inverter is incomplete. Contact a CEC-accredited installer to check the AC cable and connections. |
1501 | Value/country data error | The inverter’s country setting or grid protection parameters are incorrect. Contact a CEC-accredited installer. The inverter needs to be reconfigured with the correct country code for Australia, which requires an SMA Grid Guard code. |
3301–3303 | DC input low power | The inverter is not receiving enough power from the solar panels to begin feed-in. This is normal at dawn, dusk, heavy cloud, or rain. If persistent during clear midday, check for panel shading, a tripped DC isolator, or a string fault. Contact a CEC-accredited installer if persistent in good sunlight. |
3401–3407 | DC overvoltage | The PV string voltage exceeds the inverter’s maximum input voltage. ⚠️ Contact a CEC-accredited installer immediately. Do not restart without professional inspection. Possible causes include a string configuration error, a panel bypass diode fault, or extreme cold weather. |
3501, 3503 | Insulation failure | The inverter has detected a ground fault in the PV array or the insulation resistance is too low. ⚠️ Contact a CEC-accredited installer. Do not restart without professional inspection. Common causes include damaged MC4 connectors, water ingress, degraded cable insulation, or panel faults. This code may latch on some Sunny Boy models, requiring an installer to clear it. |
3601 | High discharge current | A leakage current to earth has been detected on the DC side during normal operation. Contact a CEC-accredited installer. Similar causes to 3501; DC wiring and panels need insulation testing. |
3701 | Residual current too high | High earth leakage current detected. ⚠️ Contact a CEC-accredited installer. Do not touch uninsulated wires. Similar causes to 3501 and 3601. This is safety-critical and may latch on some Sunny Boy models. |
3801–3802 | DC overcurrent | The inverter is measuring excessive current from the solar panels. Contact a CEC-accredited installer. Possible causes include a string wiring error, a damaged panel, or a bypass diode fault. |
6002 | Waiting for DC start conditions | The inverter has sufficient grid connection but DC voltage is too low to begin feed-in. This is normal at dawn and dusk. If persistent during good sunlight, check for a tripped DC isolator or a panel fault. |
6402 | Over-temperature | The inverter’s internal temperature has exceeded the safe operating limit. Clean cooling fins and air ducts. Ensure sufficient ventilation, ambient temperature below 40°C, and no direct sun. Consider a shade hood if this is a regular occurrence. If persistent, contact a CEC-accredited installer. |
7001–7002 | Self-diagnosis error | The inverter has detected an internal hardware or measurement fault. Try restarting the inverter by following the manufacturer's manual. If persistent, contact SMA or a CEC-accredited installer. The inverter may need service or replacement. |
7102 | Parameter file not found or defective | The required parameter file is missing or corrupt. If your inverter uses an SD card, check it is seated properly. Contact a CEC-accredited installer if persistent. |
8003 | Communication disturbed | The cause must be determined by service. Check your internet connection and WiFi. If persistent, contact a CEC-accredited installer or SMA service. |
8206 | Electric arc detected (AFCI) | The inverter’s arc fault detection has triggered. ⚠️ This indicates a potential fire risk. Contact a CEC-accredited installer immediately. Do not restart without professional inspection. False triggers are possible on some models. |
8708 | Timeout in communication for active power limitation | Communication to the system controller (e.g., Sunny Home Manager) has been lost. Check the connection to your system controller and verify no cables are damaged. If persistent, contact a CEC-accredited installer. |
8709 | Timeout in communication for reactive power specification | Communication to the system controller (e.g., Sunny Home Manager) has been lost. Check the connection to your system controller. If persistent, contact a CEC-accredited installer. |
8710 | Timeout in communication for cos-Phi specification | Communication to the system controller (e.g., Sunny Home Manager) has been lost. Check the connection to your system controller. If persistent, contact a CEC-accredited installer. |
What you can check yourself, and what you cannot
As a homeowner, you can perform several initial checks safely:
What you can check:
- Inverter Display/App/Portal: Check the event code displayed on your inverter's LCD screen (if equipped) or via the SMA Energy app or Sunny Portal. Newer Sunny Boy SBS models typically require the app or portal to view codes.
- Power Cycling: For non-safety-critical faults, you can try power cycling your inverter according to the manufacturer's manual. This usually involves turning off the AC isolator, then the DC isolator, waiting a few minutes, and then turning them back on in reverse order (DC first, then AC).
- Circuit Breakers: Check your main switchboard and any dedicated solar circuit breakers to ensure none have tripped.
- Shading: Inspect your solar panels for any new or increased shading from trees, antennas, or other obstructions, especially if you see low DC input codes (3301–3303).
- Wi-Fi/Comms: If you have communication errors (e.g., 8003, 8708), check your home internet connection and Wi-Fi signal strength near the inverter. Ensure your inverter is connected to your home network.
What you cannot check (requires a CEC-accredited installer):
- DC Isolators/Wiring: Never open or work on DC isolators or DC wiring yourself. These carry dangerous voltage during daylight hours.
- Grid Protection Settings: Adjusting grid voltage or frequency limits (related to codes like 101–105, 501, 1501) requires specific training and authorisation (e.g., SMA Grid Guard code) and must be done by a licensed electrician.
- Insulation Faults: Codes like 3501, 3503, 3601, and 3701 indicate a potential ground fault or high residual current. These are safety-critical and require professional insulation testing and repair. Do not touch uninsulated wires or attempt to restart the inverter without inspection.
- Arc Fault Detection (AFCI): Event code 8206 indicates an electric arc has been detected, which is a potential fire risk. This requires immediate professional inspection.
- Opening the Inverter Enclosure: Never open the inverter cover. All work inside the inverter or on DC wiring is restricted to licensed electricians under Australian electrical safety legislation.
- Firmware Updates: While newer models can receive remote updates, older models often require an SD card or USB dongle and a site visit from an installer.
What the published sources do not tell you
The provided installer compilation offers practical advice for common SMA event codes but has some limitations:
- Model Specificity: While it states event codes are generally consistent, it does not detail which specific codes only apply to certain SMA inverter models (e.g., Sunny Boy vs. Sunny Tripower, or specific generations).
- Comprehensive Code List: The compilation focuses on codes "most likely to encounter on a residential or light commercial SMA system in Australia" and does not provide a full list of all possible SMA event codes.
- Technical Details: Specific technical thresholds for grid parameters (e.g., exact voltage or frequency limits) or internal diagnostics are not provided.
- SMA Grid Guard Code: The specific "SMA Grid Guard code" required for reconfiguring country settings (Event 1501) is mentioned as necessary but not provided, as it is an installer-specific tool.
- SMA 360° App Details: The installer app for firmware updates, "SMA 360° app," is mentioned but not detailed in terms of its functionality or requirements.
These gaps highlight that while homeowner troubleshooting can address basic issues, detailed diagnostics and repairs often require the specialised tools, knowledge, and certifications of a CEC-accredited solar installer.
Frequently asked questions
My SMA inverter shows event codes 101–105 every day around midday. Is it broken?
No, these codes indicate grid voltage is too high, often due to high solar penetration in areas like Perth. The inverter disconnects to protect itself and will reconnect when voltage normalises. If persistent, an installer can investigate the AC wiring, verify country settings, or request a network voltage assessment.
What does SMA event code 801 (Waiting for grid voltage) mean?
This code indicates the inverter has detected a grid failure, such as a power outage, a tripped breaker, or a disconnected AC cable. The inverter will automatically restart once grid supply returns and a mandatory reconnection timer expires.
My SMA inverter shows a red LED but I cannot see an event code. What do I do?
For newer SMA Sunny Boy SBS models without an LCD screen, the event code is only visible via the SMA Energy app or the Sunny Portal. Check these platforms for the specific code and description.
I fixed a ground fault but my SMA inverter still shows 3501 and will not restart. What do I do?
On some SMA Sunny Boy models, insulation fault codes like 3501 and 3701 can latch even after the physical fault is resolved. A CEC-accredited installer is required to clear these latched codes and safely restart the inverter.
What do SMA event codes 33 and 39 mean in winter?
These codes relate to low DC input conditions, which are normal during winter due to shorter daylight hours and lower sun angles. The inverter may display them in the morning but they usually clear by mid-morning as solar production increases. If they persist during good sunlight, check for shading or a tripped DC isolator.
References
- PSW Energy: SMA Event Codes (Installer Compilation) — accessed 30 August 2026
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