A SolarEdge inverter error code is an alphanumeric diagnostic message produced when grid voltage, frequency, insulation resistance, temperature, DC input, or an internal component moves outside an allowed operating range. The code identifies a fault family, but the exact meaning depends on inverter model, firmware, country settings, and whether the message appears in mySolarEdge, SetApp, or an LCD display.
Key facts
SolarEdge codes are model- and firmware-dependent, so the inverter’s own manual is the final reference.
Codes beginning with
8xcommonly relate to AC grid, voltage, frequency, or protection events.Isolation and arc-fault messages require more caution than ordinary grid fluctuations.
P_OKandS_OKare status indicators, not fault codes.A single grid event can clear after utility voltage stabilizes; a repeated safety fault needs installer diagnosis.
Never open the inverter, disconnect rooftop wiring, or test live DC circuits as a homeowner.
What Do SolarEdge Inverter Error Codes Mean?
SolarEdge inverter error codes describe a detected operating condition, not always a failed inverter. A grid code can indicate a utility problem, while an isolation code can originate in a module cable, optimizer, connector, or damaged rooftop conductor. The same displayed family may also use an x placeholder whose value identifies a phase, channel, or firmware-specific variant.
SolarEdge systems combine a power optimizer at each module with a central inverter. That architecture changes diagnosis: normal inverter output does not prove every optimizer or module is healthy, and an inverter code does not automatically identify the failed physical component.
SolarEdge documentation groups events around AC, DC, insulation, communication, temperature, and hardware protection. Installers should therefore record the full message, timestamp, inverter serial number, firmware version, weather, and production impact before clearing anything.
How Does a SolarEdge Inverter Detect a Fault?
A SolarEdge inverter compares measurements against protection thresholds and disconnects from the grid when required conditions are not met. It monitors AC voltage, AC frequency, DC input, internal temperatures, insulation resistance, residual current, relays, and communications with power optimizers.
The same event can appear differently across interfaces. The mySolarEdge app may show a simplified alert, SetApp may expose a detailed event record, and an older LCD may display a numeric or hexadecimal code. LED behavior adds context but rarely replaces the full event description.
| Interface | Typical information | Best use |
|---|---|---|
| mySolarEdge app | Alert, timestamp, production status | Homeowner monitoring |
| SetApp | Event log, measurements, commissioning data | Installer diagnosis |
| LCD screen | Numeric code, status, menus | Legacy inverter checks |
| Inverter LEDs | Green, blue, red operating state | Immediate visual triage |
| Monitoring portal | Repeated events, power history | Correlation over days |
A code that disappears after one utility interruption is different from a red LED that returns every morning. Frequency, duration, and weather correlation matter.
SolarEdge Error Codes by Category
The following list is a practical interpretation of commonly reported SolarEdge code families. It is not a substitute for the model-specific SolarEdge installation guide, because SolarEdge has changed code presentation across product generations and firmware versions.
Which SolarEdge codes indicate grid problems?
Grid-related codes indicate that the inverter has detected AC voltage, frequency, phase, or synchronization outside its permitted range. The inverter normally disconnects rather than converting power into an unstable grid.
| Code or family | Common interpretation | Likely source | Owner response |
|---|---|---|---|
8x19 |
AC voltage too high | Utility voltage or site wiring | Record event and check whether neighbors have an issue |
8x1A |
AC voltage above limit | Utility rise or loose connection | Contact installer or utility if repeated |
8x1B |
AC voltage protection event | Grid instability | Do not change grid settings yourself |
8x1C |
AC voltage too low | Utility sag or partial outage | Confirm household power is normal |
8x1D |
Low AC voltage condition | Long cable run or utility supply | Installer voltage measurement |
8x1E |
AC voltage outside range | Utility or connection fault | Escalate when persistent |
8x2D |
Grid synchronization issue | Frequency, phase, or relay condition | Record time and duration |
154 |
Frequency outside permitted range | Utility frequency fluctuation | Utility or installer assessment |
The x in a code such as 8x19 is not necessarily a literal character on every interface. Use the complete displayed code when contacting SolarEdge support.
Practitioner rule: repeated grid errors at midday can result from local voltage rise caused by solar exports, but changing the inverter’s country or grid profile without authorization can violate interconnection requirements and create a safety problem.
What do SolarEdge isolation and ground-fault codes mean?
Isolation faults mean the DC circuit has insufficient resistance to ground, often because moisture, damaged insulation, crushed cable, contamination, or an equipment failure creates an unintended current path. The fault may appear after rain, washing, condensation, or overnight dew.
| Code or family | Common interpretation | Typical physical causes | Risk level |
|---|---|---|---|
03x9a |
Low insulation resistance | Wet junction, cable damage, optimizer fault | High |
18x86 |
Isolation fault | Module wiring, connector, or rooftop conductor | High |
8x58 |
Low Riso or insulation event | Moisture, abrasion, contamination | High |
8x2B |
Ground-current event | Leakage or residual-current condition | High |
8x2C |
RCD or ground-current fault | Leakage path or protection trip | High |
8x39 |
Ground-current surge | Sudden insulation breakdown | High |
Homeowners should not disconnect strings or measure insulation resistance. A technician uses appropriate isolation testing, string separation, optimizer data, visual inspection, and weather correlation to narrow the location. Water can dry and temporarily clear the event without repairing the underlying damage.
A fault that returns after rain is especially informative. The pattern points toward moisture ingress, but it does not identify whether the problem is a connector, module junction box, optimizer, cable, or rooftop transition.
Is SolarEdge arc-fault code 18xC dangerous?
Yes. An arc-fault message such as 18xC or 3x11 should be treated as a potential electrical fire hazard until a qualified solar technician investigates it. An arc can occur at a damaged conductor, poorly assembled connector, incompatible mating connector, loose termination, or failed equipment.
Do not repeatedly reset an arc-fault alarm. Do not unplug MC4-style connectors under load, open the inverter, or touch rooftop wiring. If there is smoke, burning odor, visible melting, or heat damage, keep people away and contact emergency services when appropriate.
| Observation | Meaning | Correct next action |
|---|---|---|
| One isolated arc event | Possible transient or connection fault | Save event record and arrange inspection |
Repeated 18xC |
Persistent wiring or equipment issue | Stop resetting and call installer |
| Melted connector | Heat damage and possible conductor failure | Qualified replacement, not tape or reseating |
| Burning odor | Immediate thermal hazard | Keep clear and seek emergency assistance |
| Code after rain | Moisture may be involved | Record weather and request insulation inspection |
SolarEdge’s exact reset sequence varies by product and installation. A manual may permit a restart after isolation, but a restart is not a repair.
What do SolarEdge thermal codes mean?
Thermal messages indicate that the inverter or an internal monitored component has exceeded, or is approaching, its permitted temperature. Commonly reported examples include 18x75, 145, and some legacy displays using E001, although the exact mapping depends on model and firmware.
| Code or family | Common interpretation | Typical check | Typical remedy |
|---|---|---|---|
18x75 |
Over-temperature protection | Clearance and heat exposure | Restore airflow, then reassess |
145 |
Temperature-related shutdown | Ambient and heatsink conditions | Installer temperature diagnosis |
E001 |
Legacy thermal or operating fault | Model manual and event details | Service based on exact model |
| Fan-related event | Cooling problem | Fan operation and debris | Qualified fan or board service |
Clear leaves, stored materials, and dust from around external ventilation paths, but do not dismantle covers or install an improvised enclosure. Direct afternoon sun, high ambient temperature, restricted clearance, and failed fans can combine to cause derating before shutdown.
A thermal code that appears only during hot afternoons may reflect installation environment rather than an immediate electronic failure. A thermal code at cool night temperatures deserves faster escalation.
Which SolarEdge codes suggest internal hardware failure?
Hardware codes indicate a suspected failure in a relay, sensor, switching stage, capacitor, communication circuit, or other internal assembly. Commonly reported examples include 18xB5, 18xB7, 18xBC, 8x3E, and 8x49.
| Code or family | Reported association | Homeowner action | Likely service path |
|---|---|---|---|
18xB5 |
DC/AC stage or capacitor-related event | Preserve logs | Installer and warranty review |
18xB7 |
Internal hardware failure | Do not open inverter | Replacement assessment |
18xBC |
Internal switching or control fault | Record serial number | Manufacturer support |
8x3E |
Hardware protection event | Stop repeated resets | Diagnostic testing |
8x49 |
Internal component fault | Check production history | Repair or replacement |
The code alone does not prove a specific capacitor or board has failed. A technician confirms the diagnosis using event history, operating measurements, model-specific service procedures, and warranty eligibility.
For older HD-Wave units, replacement may be more economical than board-level repair when labor, shipping, and downtime are included. The decision depends on warranty status, inverter age, availability of an equivalent model, and whether optimizers remain compatible.
What Do P_OK, S_OK, and Night Mode Mean?
P_OK generally indicates that the inverter sees acceptable production conditions, while S_OK indicates system status is acceptable. These labels are not equivalent to an error code. Night Mode commonly appears when the DC input is unavailable or solar irradiance is too low, but it can also appear during daylight if a disconnect is off or a system fault prevents startup.
| Display message | Usual meaning | When it becomes abnormal |
|---|---|---|
P_OK |
Production status acceptable | Production remains zero despite sunlight |
S_OK |
System status acceptable | Monitoring disagrees with local display |
Night Mode |
No usable solar input | Persists through strong daylight |
| Red LED | Fault or shutdown state | Repeats after authorized restart |
| Green LED | Operating or standby state | No production during expected sun |
Check the date, time, inverter clock, monitoring connection, AC breaker, DC disconnect, and external switch status. Never assume a dark display means the array is safe to touch; photovoltaic modules can produce hazardous DC voltage whenever illuminated.
Can a Homeowner Safely Reset a SolarEdge Inverter?
A homeowner should perform a power cycle only when the model manual or installer confirms that reset is appropriate, and only for a non-safety event such as a transient grid or thermal condition. SolarEdge systems retain hazardous DC voltage, and the correct sequence differs among inverter models, disconnect arrangements, batteries, and backup interfaces.
Before acting, photograph the display and LEDs, record the code, note the weather, and verify whether the home has a battery or backup gateway. Do not reset an arc fault, isolation fault, burning odor, visible damage, water ingress, or repeated hardware fault.
A cautious reset decision
- Record the evidence. Capture the complete code, timestamp, inverter model, LED state, and production graph.
- Check for immediate danger. Stop if there is smoke, heat damage, odor, exposed wiring, water entry, or an arc-fault or isolation alarm.
- Check simple external conditions. Confirm household power, authorized disconnect positions, ventilation clearance, and monitoring connectivity.
- Use the model manual. Follow its shutdown and startup sequence exactly, including battery or backup equipment instructions.
- Restart once only when permitted. Do not cycle repeatedly to force production.
- Verify the result. Check whether the code clears, the LEDs return to normal, and production resumes.
- Escalate persistent events. Send the installer the photographs, event history, serial number, and restart result.
The frequently repeated “five-minute reset” is not universal. Waiting five minutes may allow stored energy to decay, but it does not make rooftop conductors safe, and it cannot correct damaged insulation or an arc.
How Do You Tell an Inverter Fault From an Optimizer Fault?
An inverter fault affects conversion, grid connection, protection, or system control, while an optimizer fault usually affects one module or a small section of array production. Monitoring data helps separate the two, but only an installer should perform electrical isolation tests.
| Symptom | More consistent with inverter | More consistent with optimizer or module |
|---|---|---|
| Entire array stops producing | Yes | Only if a system-level condition propagates |
| One module reports low output | No | Yes |
| Grid voltage code | Yes or utility | No |
| Isolation event after rain | Possible | Possible, often rooftop-side |
| Repeated internal hardware code | Yes | No |
| Module-level communication loss | Sometimes | Yes |
| Production returns after utility stabilizes | Yes | No |
A professional compares inverter events with module-level telemetry, string voltage, optimizer communication, and site conditions. An installer should not replace an optimizer solely because one module underproduces, since shading, soiling, module degradation, connector damage, and communication issues can produce similar symptoms.
What Should You Do When an Error Appears After Rain?
A SolarEdge error that appears after rain should be treated as a possible moisture-related insulation or connector problem, especially when the message is an isolation, ground-current, or arc-fault event. Record the rainfall timing and do not assume that a dry day has solved the fault.
| Rain pattern | Probable direction | Useful evidence |
|---|---|---|
| Fault starts during rain | Water ingress | Exact start time and code |
| Fault clears after drying | Intermittent moisture path | Repeated weather correlation |
| Fault follows heavy wind | Cable movement or connector stress | Visual inspection by technician |
| Fault persists for days | Damage or failed equipment | Event recurrence and zero production |
The technician may inspect module junction boxes, optimizer seals, cable routing, connector compatibility, rooftop penetrations, and exposed conductors. Insulation testing should follow equipment and safety procedures; improvised resistance measurements can damage equipment or expose the tester to dangerous voltage.
What Does SolarEdge Repair Cost and How Long Does It Take?
Typical out-of-warranty SolarEdge service costs range from about $150 for a straightforward diagnostic visit to more than $3,500 for difficult access and complete replacement. Actual pricing depends on region, roof access, equipment availability, labor rates, warranty coverage, and whether a utility or electrical permit is required.
| Service situation | Typical cost | Typical timeframe | Main variable |
|---|---|---|---|
| Remote event review | $0-$150 | Same day to 3 days | Installer policy |
| Grid investigation | $150-$400 | 1-7 days | Utility response |
| Isolation fault repair | $250-$900 | 1-5 days | Roof access and cable damage |
| Optimizer replacement | $300-$700 | 3-10 days | Module access and parts |
| Warranty inverter replacement | $200-$600 labor | 1-3 weeks | Shipping and authorization |
| Paid inverter replacement | $1,800-$3,500 | 2-10 days | Size, model, and labor |
These are typical planning ranges, not published SolarEdge prices. Obtain a written quote that separates diagnostic labor, replacement parts, travel, lift equipment, permitting, and disposal.
Warranty claims move faster when the installer receives the full serial number, proof of purchase or installation date, event screenshots, production history, and photographs of the LEDs and enclosure.
When Should You Call a Solar Installer?
Call a qualified installer immediately for arc-fault messages, isolation faults, visible damage, burning odor, water ingress, repeated red LEDs, internal hardware codes, or any event that returns after one authorized restart. Contact the utility when the inverter repeatedly reports voltage or frequency problems and neighboring electrical service is also affected.
Use this escalation checklist:
- Exact code, including every digit and letter.
- Inverter model and serial number.
- mySolarEdge or SetApp screenshot.
- LED colors and whether they are solid or flashing.
- Date, time, sunlight, rain, wind, and temperature.
- Production before and after the event.
- Whether the home has storage, backup, or a second inverter.
- Result of any single authorized restart.
What installers should test first
Installers typically begin with event chronology, AC measurements, DC and optimizer telemetry, insulation assessment, and visual inspection. They should avoid replacing an inverter before ruling out an external grid condition, because a new inverter will disconnect in the same abnormal utility environment.
Isolation events require controlled string or optimizer testing. Arc-fault events require inspection of conductors and connectors, not repeated resets. Hardware events require model-specific service procedures and warranty documentation.
SolarEdge Codes Compared With LED and Monitoring Symptoms
A code is more actionable than an LED color alone because the code identifies a monitored condition. Monitoring loss, however, can exist without an inverter fault when the internet connection, cellular service, router, or communication board fails.
| Evidence source | Diagnostic precision | Common limitation | Best follow-up |
|---|---|---|---|
| Full event code | High | Model-dependent meaning | Check manual and history |
| LED state | Medium-low | Several events share colors | Photograph and identify model |
| Production graph | Medium | Delay or communication loss | Compare local and portal data |
| Optimizer telemetry | Medium-high | Requires communication | Compare affected modules |
| Utility meter | Medium | Does not isolate solar fault | Confirm export or generation |
Monitoring loss is not the same as zero generation. Check the inverter display or installer portal before concluding that the array has stopped producing.
Common Diagnostic Mistakes
Repeatedly resetting a safety fault
Repeated resets can conceal a persistent arc or leakage condition and may increase damage at a poor connection. One authorized restart is a reasonable limit for a non-safety event; safety alarms require inspection.
Changing the country or grid profile
Grid settings control disconnection thresholds and compliance behavior. Only an authorized installer should change them, and only when the utility-approved configuration requires it.
Replacing an optimizer from one low module
One low-producing module can result from shade, dirt, module degradation, a connector, or telemetry delay. Compare the module’s historical output and physical conditions before authorizing replacement.
Treating a cleared code as a repaired code
Moisture evaporates, voltage stabilizes, and temperature falls. Those changes can clear an event while leaving the underlying fault intact.
Opening a screenless inverter
A screenless SolarEdge inverter still contains hazardous AC and DC circuits. Lack of a display does not make internal inspection suitable for an unqualified person.
Frequently Asked Questions
Can a SolarEdge inverter error clear by itself?
A SolarEdge grid or temperature event can clear automatically when voltage, frequency, or temperature returns to an acceptable range. An event that clears remains useful evidence, especially if it recurs at the same time, during rain, or under high export. Isolation, arc-fault, and hardware messages should not be dismissed because the display later returns to normal.
Why does my SolarEdge inverter show an error only at night?
A SolarEdge inverter may show Night Mode or a low-DC condition at night because photovoltaic modules are not producing usable input. A genuine fault is more likely when the message remains during full daylight, production stays at zero, or the AC and DC disconnect positions do not match the installation instructions.
Can I turn off a SolarEdge inverter during a storm?
Do not create a new shutdown procedure during a storm unless the installer or model manual gives a specific instruction. Lightning, wet surfaces, and rooftop equipment increase risk. If the system shows smoke, visible damage, or burning odor, keep away and seek qualified or emergency assistance rather than approaching the inverter.
How long can a SolarEdge inverter remain offline?
A non-safety grid event may resolve within minutes or hours, while an isolation or hardware failure can leave the system offline until a technician repairs it. If production remains at zero for more than one sunny day, or a fault repeats across two days, contact the installer with the event history.
Does a SolarEdge error code mean the inverter needs replacement?
No. Grid disturbances, blocked airflow, moisture, damaged connectors, and optimizer problems can all produce error messages without requiring inverter replacement. Replacement becomes more likely when model-specific testing confirms an internal hardware failure, the unit is outside economical repair, or SolarEdge authorizes a warranty exchange.
Where is the official SolarEdge code list?
The official reference is the installation or service guide for the exact SolarEdge inverter model and regional firmware, available through SolarEdge documentation and installer support channels. Generic online lists can help identify a code family, but they should not override the model manual or the installer’s diagnostic results.
The Bottom Line
The most reliable SolarEdge inverter error codes list is a starting point, not a universal repair manual. Record the complete code, model, LED state, weather, and production impact; treat arc-fault and isolation messages as safety events; use only the reset procedure authorized for the specific system; and escalate repeated grid, thermal, or hardware faults with complete evidence. The exact SolarEdge inverter error code, combined with event timing and system context, determines the correct repair path.