Your SolarEdge inverter has stopped producing power, is showing a red LED, or is displaying an unfamiliar code on the LCD screen or in the mySolarEdge app. Every error code corresponds to a specific condition that the system has detected. Some clear themselves within minutes. Others need a qualified electrician.
Last reviewed: April 2026. Error code lists verified against current SolarEdge Knowledge Centre documentation, installation guide addendum, and mySolarEdge monitoring platform alert descriptions. 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 SolarEdge residential range installed in Australia:
- SE series – legacy single-phase
- HD-Wave – single-phase, SetApp-enabled
- Energy Hub – tsingle-phase and three-phase with battery capability
- and the associated P-series and S-series power optimisers.
SolarEdge systems are different from most other residential inverters because they use power optimisers on each panel. This means some faults relate to the inverter itself, some to individual optimisers, and some to the communication between the two. This guide covers all three.
Contents
SolarEdge error code formats
SolarEdge error codes can look confusing because the format varies depending on your inverter’s firmware version. Understanding which format applies to your system helps you look up the right code.
- Older firmware (CPU v3.18xx and earlier): Uses simple numeric codes like 2, 7, 10, 14, 15. These appear on the LCD screen of legacy SE-series inverters.
- Newer firmware (CPU v3.19xx and later, including 4.x): Uses hexadecimal-style codes like 2x1, 2xE, 8x19, 18xA6. The "x" represents a variable digit. These appear on the LCD screen of HD-Wave and newer inverters.
- Monitoring platform alerts: The SolarEdge monitoring portal and mySolarEdge app display alerts in plain English (e.g., "Isolation Fault", "AC Voltage Too High") rather than numeric codes. If you are checking your system through the app, you will see the alert name rather than the raw code number.
- SetApp inverters (no LCD display): HD-Wave inverters without a physical screen display errors through LED indicators and the mySolarEdge app only. The red P/1/0 switch position and LED colour tell you the general status; the app or monitoring portal provides the specific code.
The tables below list errors by their description so you can find your fault regardless of which code format your inverter uses. Where relevant, both firmware code versions are noted.
Finding your error code
LCD-equipped inverters (SE series, some HD-Wave): Press and quickly release the LCD button on the front of the inverter. The screen cycles through status pages: AC voltage, DC voltage, power output, and the error display. The error code and a brief text description appear together.
SetApp inverters (HD-Wave, Energy Hub): Open the mySolarEdge app on your phone. Navigate to your system and check the dashboard for active alerts. You can also access the SolarEdge monitoring portal at monitoring.solaredge.com for detailed error history and alert descriptions.
LED indicators: All SolarEdge inverters have three LEDs on the front panel: blue (communication), green (production), and red (fault). A quick visual check tells you the general state before you look up the specific code.
Before you start
Try a power cycle
Many SolarEdge error codes resolve with a standard power cycle. Before contacting your installer, try this:
- Switch the red P/1/0 switch on the bottom of the inverter to the 0 (OFF) position
- Wait until the LCD shows the DC voltage dropping below 50V. If your inverter has no LCD, wait at least five minutes
- Switch OFF the DC disconnect (the black dial on the front of the inverter, or the external DC isolator)
- Switch OFF the AC isolator (circuit breaker in your switchboard labelled “Solar” or “Inverter”)
- Wait at least two minutes with everything off
- Switch ON the AC isolator first
- Switch ON the DC disconnect
- Switch the red P/1/0 switch to the 1 (ON) position
- Wait for the inverter to complete its start-up sequence. The green LED should begin flashing (indicating production) within a few minutes if sunlight is available
If the code reappears after the power cycle, note the exact code and time, then look it up below.
Safety notice: Never open the inverter cover or disconnect DC connectors yourself. SolarEdge power optimisers reduce string voltage to a safe level (1V per optimiser) when the inverter is off, but only after the inverter completes its shutdown sequence. Always wait for confirmation of safe voltage before any DC work. All work inside the inverter or on DC wiring is restricted to licensed electricians under Western Australian electrical safety legislation.
Grid and AC-related errors
These errors indicate the grid supply at your property is outside the inverter’s permitted operating range, or there is an issue with the AC wiring between the inverter and the grid. The inverter shuts down to comply with AS 4777.2 protection requirements and restarts automatically when conditions normalise.
In Perth, AC voltage errors are the most common SolarEdge faults. Grid voltage on the SWIS network rises during high-solar-export periods, particularly in suburbs with dense rooftop PV. If you see an AC voltage error around midday that clears by late afternoon, this is a network issue rather than an inverter problem.
| Error description | Code references | What to do |
|---|---|---|
AC Voltage Too High | 14 / 2xE / 8×19-8x1B | Most common error code in Perth. Grid voltage exceeds the AS 4777.2 upper limit. Usually caused by high network voltage during peak solar hours. The inverter restarts automatically when voltage drops. If persistent, your installer can verify the inverter’s country setting is correct, check the AC wiring gauge and length, or request a Western Power network voltage assessment |
AC Voltage Too Low | 2xE / 8×19-8x1B (variant) | Grid voltage has dropped below the permitted minimum. Check for a localised outage. If persistent, contact your installer to check AC connections and wire sizing |
Grid Shutdown | 7 / 2×5 / 8×12 | The grid supply is down. Check your switchboard for tripped breakers and confirm whether there is an area outage on the Western Power outage map. The inverter will restart automatically once grid supply returns and the reconnection timer expires (AS 4777.2 mandates a minimum reconnection delay) |
AC Frequency Out of Range | Various | Grid frequency has drifted outside the permitted window. Rare in WA. Automatic reconnection once frequency stabilises. If persistent, contact your installer |
Islanding Detected | 2×3 / 2×4 | The inverter detected a potential island condition (continued generation without a stable grid connection) and disconnected as a safety measure. This is mandatory under AS 4777.2. Automatic restart after the monitoring period. No action required unless persistent |
AC Voltage Surge | 8×19-8x1B (surge variant) | A transient voltage spike on the AC side. Check with your installer whether a large load or surge source exists near the site. Verify AC connections are secure |
Phase Balance Error | Various (three-phase) | Three-phase inverters only. The voltage or current across phases is not balanced within permitted limits. Check the grid connection and consult with the grid operator |
DC and isolation errors
These errors relate to the DC side of the system: the solar panels, power optimisers, DC wiring, and the connection between them and the inverter. Isolation faults and ground faults are the most common DC-side issues and are often caused by moisture ingress.
| Error description | Code references | What to do |
|---|---|---|
Isolation Fault (RISO) | 2×1 / various 8x codes | The insulation resistance between the PV array and earth is too low. This is a safety-critical fault. Contact your installer. Do not restart without professional inspection. Common causes: moisture in a rooftop DC isolator or MC4 connector, damaged cable insulation, a degraded panel junction box, or a faulty power optimiser. More common after rain or storms. If the fault clears in dry weather but returns after rain, there is likely a water ingress point that needs to be sealed |
Ground Current / RCD | 10, 37 / 2xA, 2×25 / 76, 77, 90 / 8x2B, 8x2C, 8×39 | ⚠️ Electrical shock hazard. Ground leakage current detected. Do not touch uninsulated wires. Contact your installer immediately. The inverter must be switched off and each DC string tested individually to identify the faulting string. Do not reconnect strings with a ground fault |
DC Voltage Too High | 15 / 2xF / 85, 86, 88 / 8×34-8×37 | The SolarEdge system normally prevents DC overvoltage through the power optimisers. If this error appears: switch the P/1/0 switch to OFF, wait until the LCD shows safe voltage (1V per optimiser), then check which string is faulting and verify connections. If persistent, contact your installer |
Arc Fault Detected (AFCI) | 12 / 3×2 | ⚠️ Potential fire risk. The inverter’s arc fault detection has triggered. Do not restart without professional inspection. Arc faults in DC wiring can indicate a loose MC4 connector, damaged cable insulation, or a corroded junction. Contact your installer immediately |
Optimiser Communication Error | P_OK display mismatch | The LCD shows P_OK: XXX/YYY where XXX and YYY are not equal. This means one or more power optimisers are not communicating with the inverter. The inverter continues to operate with the remaining optimisers. Check the monitoring portal to identify which optimiser(s) are offline. Common causes: a loose optimiser connector, a failed optimiser, or a wiring break in the string. Contact your installer to inspect the affected string |
Hardware and internal errors
These errors indicate a fault within the inverter itself. Always try a full power cycle first. If the code returns, professional service is required.
| Error description | Code references | What to do |
|---|---|---|
Hardware Error | 2×10, 2×95, 2×59, 2xB5 / 18xA6-18xA8, 18xAA | Internal hardware fault. Contact SolarEdge support or your installer. The inverter may need replacement under warranty. SolarEdge inverters carry a 12-year standard warranty (extendable to 20 or 25 years) |
Software Error | 2×13, 2×15, 2×16, 3×2, 2x2D, 3xC, 3xF | Internal software or firmware error. Try a power cycle. If persistent, the inverter may need a firmware update or replacement. Contact your installer |
Temperature Too High | Various | The inverter’s internal temperature has exceeded the safe operating limit. Check ventilation: clear debris, spider webs, or vegetation within 300mm of the heatsink fins. In Perth, this is common on 40°C+ days, especially for inverters mounted in direct afternoon sun. The inverter will derate before shutting down entirely. Consider a shade hood if this occurs regularly |
Faulty Temperature Sensor | Various | An internal temperature sensor is broken or disconnected. Contact SolarEdge support |
Fan Failure | Monitoring alert | The inverter’s cooling fan is not operating. Try a power cycle. If the fan does not restart, it may need replacement. Contact your installer |
Communication Error (internal) | Various | Internal communication between the inverter’s processor and other components has failed. Power cycle. If persistent, contact your installer. This may indicate a firmware or hardware issue |
Battery and Energy Hub errors
If you have a SolarEdge Energy Hub inverter with a connected battery (SolarEdge Home Battery, or a compatible third-party battery such as LG RESU or BYD), you may see additional alerts related to the battery, backup output, and energy management. These alerts appear in the mySolarEdge app and monitoring platform.
| Alert description | What to do |
|---|---|
Battery Not Communicating | Check the communication cable between the inverter and battery. Verify the battery circuit breaker has not tripped. Try a power cycle of both the inverter and battery. If persistent, contact PSW Life Support |
Battery Lockout State | The battery has entered a protective lockout. This typically requires professional intervention. Contact SolarEdge support or your installer |
Battery Circuit Breaker Tripped | The battery’s internal or external circuit breaker has tripped. This may be caused by an overcurrent event. Reset the breaker if accessible. If it trips again, contact your installer |
Backup Socket Malfunction | The backup output has stopped operating. Check whether the backed-up loads exceed the inverter’s backup capacity. Turn off high-draw appliances on the backup circuit, then power cycle the inverter. If persistent, contact your installer |
Backup Overload | The total load on the backup circuit exceeds the inverter’s rated backup output. Reduce the load by turning off non-essential appliances. The inverter may trip during operation of half-wave loads (hair dryers, some drills) while in backup mode. This is a known behaviour, not a hardware fault |
AC Terminal Critical Temperature | The inverter has detected dangerously high temperature at one of its AC terminal connections. This is often caused by a loose terminal. The inverter stops production to prevent fire risk. Contact your installer immediately. The AC terminal connections need inspection and retorquing |
SolarEdge LED status indicators
All SolarEdge inverters use three LEDs on the front panel. These give you a quick status check before you look up specific codes.
| LED | State | Meaning |
|---|---|---|
Green | Solid or fast blinking | Normal operation. The inverter is producing AC power. Faster blinking indicates higher output |
Green | Slow blinking | Connected to the grid but not producing. Normal at night, during heavy cloud, or when DC voltage is below the start threshold |
Green | Off | No production. The inverter is either in night mode, shut down, or in a fault state. Check for a red LED |
Blue | Solid on | The inverter is communicating with SolarEdge servers. Monitoring data is being transmitted |
Blue | Off | No communication with SolarEdge servers. The inverter is not connected to the internet. Follow the SolarEdge WiFi reconnection guide to restore connectivity |
Red | Solid on | A fault has occurred. Check the LCD screen (if available) or the mySolarEdge app for the specific error code. Try a power cycle |
Red | Flashing | An error is active and the inverter is attempting recovery. If the red LED persists after a power cycle, contact your installer |
All LEDs off | — | No power to the inverter. Check that the AC isolator, DC disconnect, and P/1/0 switch are all in the ON position |
Codes needing professional attention
Most SolarEdge error codes are either temporary (grid-related) or can be resolved with a power cycle. The following codes require prompt action from a qualified electrician. Do not attempt a restart without professional advice if you see any of these:
- Isolation Fault (2x1): Earth insulation breakdown. Possible electrical safety risk in the DC wiring, panels, or optimisers
- Ground Current / RCD (multiple codes): Earth leakage current detected. Electrical shock hazard. Do not touch uninsulated wires
- Arc Fault Detected (12 / 3x2): Potential fire risk in DC wiring. Do not restart
- AC Terminal Critical Temperature: Possible loose AC terminal. Fire risk. The inverter has stopped for a reason
- DC Voltage Too High (persistent): The optimiser safety voltage system may not be functioning correctly
PSW customers: For any code in this list, contact PSW Life Support. All other customers should call their original installer.
SolarEdge power optimiser issues
Unlike standard inverters, SolarEdge systems have a power optimiser attached to each panel (or panel pair). Optimiser problems can affect individual panels rather than the entire system.
Checking optimiser status: Log in to the SolarEdge monitoring portal at monitoring.solaredge.com. Navigate to your site and click the “Layout” tab. Each panel is shown with its current status. Panels with communication issues or low output are flagged.
P_OK display: On LCD-equipped inverters, the main status screen shows P_OK: XXX/YYY. The first number is the count of communicating optimisers; the second is the total expected. If these numbers don’t match, one or more optimisers have dropped communication.
Common optimiser issues:
Single optimiser not reporting: Usually a loose MC4 connector on the optimiser input or output. Your installer can identify and reseat the connection
Multiple optimisers not reporting: May indicate a string wiring break rather than multiple failed optimisers. Check from the inverter end of the string
Low output on one panel: Check the monitoring portal for that specific optimiser. Could be shading, bird mess, a cracked panel, or a failing optimiser. The panel-level monitoring is one of SolarEdge’s key advantages for diagnosing these issues
Optimiser safety voltage: When the inverter is off, each optimiser reduces its output to approximately 1V for safety. If the inverter LCD does not show low voltage (roughly 1V per optimiser in the string) after shutdown, there may be a faulty optimiser maintaining higher voltage. Contact your installer. Do not work on the DC side until safe voltage is confirmed
SolarEdge WiFi and monitoring issues
If your inverter’s blue LED is off, the system is not communicating with SolarEdge servers. Your solar system continues to generate power normally; you just cannot see the data in the mySolarEdge app or monitoring portal.
PSW has a dedicated step-by-step guide for reconnecting your SolarEdge inverter to WiFi. See the SolarEdge WiFi reconnection guide for instructions. Quick monitoring checks:
- Blue LED solid: Communication is working. If the app is not updating, the issue may be server-side or a delay in data processing
- Blue LED off: No internet connection. Follow the WiFi reconnection guide
- S_OK on LCD display: Confirms successful communication with SolarEdge servers
- S_ERR on LCD display: Communication has failed. Check WiFi, router, and internet connection
Keeping your SolarEdge firmware current
SolarEdge releases firmware updates that improve grid compliance, fix bugs, and add features. Keeping firmware current can prevent or resolve many error codes.
SetApp inverters (HD-Wave, Energy Hub): Firmware updates are typically pushed remotely by SolarEdge when the inverter is connected to the internet. Your installer can also initiate updates through the SetApp mobile app during a site visit. Check your current firmware version in the mySolarEdge app or monitoring portal under the inverter details.
Legacy SE-series inverters: Firmware updates require a site visit by your installer using the SetApp or commissioning tools.
If your inverter is not connected to the internet, it cannot receive automatic firmware updates or communicate fault data to SolarEdge. PSW recommends connecting your inverter to your home WiFi to enable remote monitoring, firmware updates, and fault notifications.
Frequently asked questions
My inverter shows "AC Voltage Too High" every day around midday. Is it broken?
No. This is the most common SolarEdge alert in Perth. Under AS 4777.2:2020, your inverter must disconnect when the grid voltage exceeds the permitted threshold.
This is common in suburbs with high rooftop solar penetration, where many systems export simultaneously, pushing local network voltage up. The inverter restarts automatically when voltage drops. If this is significantly reducing your generation, your installer can verify the country settings, check AC wiring, or request a Western Power network voltage assessment.
What does the P_OK display mean?
P_OK: XXX/YYY shows the number of communicating power optimisers versus the total expected. If the numbers match (e.g., P_OK: 20/20), all optimisers are reporting normally. If they don’t match (e.g., P_OK: 18/20), two optimisers have lost communication. Check the monitoring portal to identify which panels are affected, then contact your installer.
My inverter shows a red LED but no error code on the screen. What do I do?
If you have a SetApp inverter (no LCD display), the error details are only available through the mySolarEdge app or monitoring portal. Log in and check for active alerts. If you cannot access the app, try a power cycle. If the red LED persists after the power cycle, contact your installer with the approximate time the red LED appeared.
I have an Isolation Fault that only appears after rain. Is this serious?
It depends. Moisture ingress into MC4 connectors, panel junction boxes, or rooftop DC isolators commonly causes temporary isolation faults. If the fault clears when the system dries out, there is a water ingress point that needs to be found and sealed.
If left unaddressed, it will worsen over time. If the fault persists in dry conditions, the insulation on your DC wiring or a panel may be degraded. Contact your installer for an insulation resistance test.
Can I check my SolarEdge system from my phone?
Yes. Download the mySolarEdge app (iOS or Android). You can monitor production, view panel-level data, check active alerts, and review error history. The app also shows your battery status if you have an Energy Hub system with a connected battery.
I have an error code not listed here. What should I do?
PSW customers should contact PSW Life Support with the error code or alert description, their inverter model and serial number, and the approximate time the error appeared. We service SolarEdge inverters across Perth and can diagnose many issues remotely through the monitoring platform.
References
- SolarEdge Knowledge Centre: Error codes and troubleshooting (installation guide addendum)
SolarEdge Knowledge Centre: Troubleshooting alerts in the monitoring platform
SolarEdge Knowledge Centre: Isolation fault troubleshooting
SolarEdge: Residential inverter firmware release notes
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. SolarEdge firmware updates may introduce new error codes or modify existing behaviour. PSW customers should contact PSW Life Support for the latest information.
