An SMA inverter error codes list is a reference for event numbers, warnings, and legacy text messages reported by SMA Sunny Boy, Sunny Tripower, battery, and other inverter families. Event meanings vary by model, firmware, country data set, and connected equipment, so the exact product manual remains authoritative. Record the full code and operating conditions before resetting or isolating the system.
Key Facts
SMA calls many diagnostic identifiers event numbers, and the same number can have different meanings across product families.
Events 101-105 commonly relate to AC grid voltage or frequency, but the exact event text determines the corrective action.
Events 3301-3407 can involve insufficient DC input, unstable operation, or excessive PV voltage.
Events 3501 and 3701 indicate potentially hazardous insulation or residual-current conditions that require qualified investigation.
An AFCI event must not be repeatedly cleared without inspecting accessible DC equipment and finding the cause.
A communication event can stop monitoring without stopping solar production, so portal failure is not automatically an inverter failure.
How Should You Read an SMA Event Number?
An SMA event number identifies a detected condition, but it does not function as a universal code dictionary across every SMA inverter. The event text, status level, timestamp, product designation, firmware version, and country setting together define the diagnosis.
SMA systems commonly display event information on an LCD, local Web UI, Sunny Portal powered by ennexOS, or a connected data logger. A notification may be classified as information, warning, or error. An information event can describe a normal state change, while an error may cause disconnection from the public grid.
SMA documentation uses safety language that should guide owner behavior: “Danger to life due to high voltages in the inverter.” The warning applies even when the display is dark, because PV modules can energize DC conductors during daylight and internal capacitors can retain energy after shutdown.
Are SMA code ranges universal?
No. Broad numerical patterns can help with orientation, but they are not a substitute for the manual for a specific inverter. A Sunny Boy 5.0, a legacy Sunny Boy TL, and a Sunny Tripower may use overlapping numbers with different descriptions or severity levels.
The following orientation table is useful for triage, not for final identification.
| Approximate range or example | Common diagnostic area | Typical consequence | Verification source |
|---|---|---|---|
| 101-105 | AC voltage, frequency, or grid separation | Feed-in pauses until limits recover | Exact event text and country data set |
| 1001 | AC wiring or installation configuration | Startup or grid connection blocked | Installation manual and electrician tests |
| 3301-3303 | Low or unstable DC input | No feed-in or intermittent startup | PV voltage, irradiance, string condition |
| 3401-3407 | DC overvoltage | Inverter protection or shutdown | Cold-weather string voltage calculation |
| 3501, 3503 | Low insulation resistance | Feed-in blocked for safety | Insulation testing by a qualified technician |
| 3701 | Residual current or earth fault | Safety disconnection | Array and AC leakage investigation |
| 4301 | AFCI or arc detection on applicable models | Feed-in stops or requires acknowledgement | DC connection and arc-fault inspection |
| 6406-6438 | Internal hardware or power-stage diagnosis | Repeated shutdown or service requirement | SMA service procedure |
| 7101, 7508 | Memory, fan, or internal service condition | Logging failure or thermal derating | Product-specific service instructions |
| 8301-8302 | Surge protection device condition | Protection reduced or feed-in interrupted | Wiring box and SPD inspection |
| 9002-9003 | Grid Guard or parameter access | Settings cannot be changed | SMA authorization and commissioning records |
| 10283-10284 | WLAN or communication path | Monitoring interruption | Local network and inverter interface |
Which SMA Inverter Error Codes Are Most Common?
The most useful list groups events by the system area they affect, then separates temporary conditions from hazards and hardware failures. Event numbers below are representative examples from SMA documentation and service references; the exact display wording must be checked against the installed model.
| Event example | Likely meaning | Usually temporary? | First appropriate response |
|---|---|---|---|
| 101-105 | Grid voltage or frequency outside permitted range | Often | Check whether the utility is unstable and record recurrence |
| 1001 | Wiring, polarity, or installation configuration problem | No | Stop owner troubleshooting and contact the installer |
| 3301-3303 | Insufficient or unstable PV power | Sometimes | Compare timing with sunrise, shade, snow, or heavy cloud |
| 3401-3407 | PV array voltage above inverter limit | No | Do not keep restarting; isolate through the approved procedure |
| 3501, 3503 | Low DC insulation resistance | Sometimes weather-related | Keep the system isolated and arrange qualified testing |
| 3701 | Residual current or earth fault | No until diagnosed | Treat as a possible shock hazard |
| 4301 | Arc-fault detection on supported equipment | No until inspected | Do not repeatedly acknowledge or reset |
| 6406-6438 | Internal current, switching, or electronics fault | Rarely | One controlled restart may be appropriate if the manual permits |
| 7101 | Internal memory or data-storage issue | Sometimes | Check event history; arrange service if persistent |
| 7508 | Fan or cooling-related fault on applicable units | No if recurring | Inspect external airflow only; do not open the inverter |
| 8301-8302 | Surge arrester or varistor failure | No | Have the wiring compartment inspected and cartridges replaced |
| 9002-9003 | Grid Guard or parameter access restriction | No | Use authorized commissioning credentials |
| 10283-10284 | WLAN or local communication failure | Often | Test router, signal, and wired communication options |
What do grid events 101-105 mean?
Events 101-105 generally indicate that the inverter measured an AC grid condition outside its permitted operating window. The inverter disconnects to meet interconnection requirements, then normally attempts reconnection after voltage or frequency remains acceptable for the required time.
A grid event is not proof that the inverter is defective. Long cable runs, a high-impedance service connection, a transformer tap issue, or a local utility voltage rise can produce an event even when household appliances appear normal. Record the event time, AC voltage if the inverter reports it, and whether nearby buildings also lost power.
Do not change voltage or frequency limits yourself. The limits depend on the approved country data set, such as IEEE 1547, UL 1741, AS/NZS 4777, or EN 50549, and unauthorized changes can breach grid rules.
What do DC events 3301-3407 indicate?
Events 3301-3303 usually point to inadequate or unstable PV input, while Events 3401-3407 can indicate PV voltage exceeding the inverter’s permitted maximum. Low-power events commonly occur at dawn, dusk, in fog, or under snow; overvoltage is an electrical design problem that can become more severe during cold weather.
The relevant design relationship is simple: PV open-circuit voltage rises as module temperature falls. A string that appears acceptable on a warm roof may exceed the inverter’s DC maximum on the site’s lowest design temperature. A technician should compare the measured and calculated cold-weather voltage with the inverter nameplate limit.
Why do insulation and residual-current events occur?
Insulation events occur when resistance between DC conductors and protective earth falls below the inverter’s safety threshold. Common physical causes include damaged rooftop cable insulation, wet connectors, crushed conduit, animal damage, water inside junction boxes, and incorrectly terminated modules.
Event 3501 or 3503 should not be treated as a nuisance notification. Event 3701 can indicate residual current or an earth fault, and the location may be on the PV side, AC side, or connected equipment depending on the model. A qualified electrician uses the manufacturer’s test method and suitable insulation equipment; a homeowner should not disconnect MC4 connectors under load.
What should happen after an AFCI event?
An AFCI event means the inverter’s arc-fault protection detected electrical behavior consistent with a DC arc on equipment that supports AFCI. Loose terminals, poorly crimped connectors, damaged cables, failed isolators, and water ingress are common investigation points.
Turn the system off using the approved isolation equipment and arrange inspection if the event returns. Do not repeatedly reset Events 4301 or related arc notifications, because a high-resistance connection can heat under load before it develops into visible damage. Charred plastic, odor, melted insulation, or crackling sounds require immediate electrical service.
How Do SMA LEDs Relate to Error Codes?
SMA LED colors indicate broad operating states, while the event number supplies the specific diagnostic detail. LED behavior differs by inverter generation, so the display or manual overrides a generic color interpretation.
| LED indication | Common state | Production implication | Next check |
|---|---|---|---|
| Solid green | Normal operation | Inverter is feeding power | Confirm current and daily yield |
| Pulsing green | Startup, standby, or insufficient DC | No or limited feed-in | Check irradiance and event history |
| Yellow or amber | Warning, derating, or restricted operation | Production may be reduced | Read the exact event text |
| Solid red | Fault or safety shutdown | Feed-in usually stopped | Record code and follow stop conditions |
| No visible LED | Night, loss of supply, or fault | Status cannot be inferred | Check AC supply only if safe and authorized |
A pulsing green LED at sunrise can be normal. A pulsing green LED at midday with Events 3301-3303 is more significant, particularly when neighboring arrays are producing and the weather is clear.
A red LED does not identify the failed component by itself. It only increases the urgency of retrieving the event history and determining whether the condition involves the grid, array insulation, AFCI, or internal hardware.
How Can You Reset an SMA Inverter Safely?
A controlled SMA restart normally takes 10-15 minutes, excluding any visual inspection, and should be attempted only when the manual permits a reset and there is no smoke, burning odor, water entry, exposed conductor, arc evidence, or active ground-fault concern. The correct sequence is AC off, DC off, waiting period, AC on, then DC on.
Before you start
| Item | Typical requirement | Why it matters | Owner limitation |
|---|---|---|---|
| Recorded event code | Exact digits and text | Prevents loss of diagnostic context | Photograph the display or portal |
| Waiting time | At least 5-10 minutes | Allows internal energy storage to discharge | Do not open the enclosure |
| Visual inspection | 5-10 minutes | Finds heat, water, cable, or debris clues | Inspect accessible areas only |
| Tools | Phone, flashlight, notebook | Documents conditions safely | No live DC probing |
| Service escalation | Same day for safety faults | Reduces repeated energization | Use a qualified installer |
Step 1: Record the event and conditions
Write down the exact number, event text, LED state, inverter model, and time. Note whether the fault appeared at startup, during midday output, after rain, during extreme heat, or after a utility interruption.
Success checkpoint: The record includes enough detail for an installer to identify the product manual and reproduce the operating context.
Common mistake: Recording only “red light” or “SMA error” removes the information needed to distinguish a grid event from an insulation fault.
Step 2: Turn off the AC supply
Switch off the designated solar AC breaker or isolator according to the site labeling and local procedure. Do not remove covers or work inside the switchboard unless you are qualified and authorized.
Success checkpoint: The inverter’s AC supply is isolated through the intended switching device.
Common mistake: Turning off a household main switch without knowing whether the solar circuit remains energized.
Step 3: Turn off the DC isolator
Set the inverter’s integrated DC switch, external PV isolator, or Electronic Solar Switch to the manufacturer’s OFF position. Never unplug DC connectors while current is flowing.
Success checkpoint: The DC isolation handle is visibly in the documented OFF position.
Common mistake: Treating the DC switch as proof that every conductor is voltage-free in daylight.
Step 4: Wait and inspect accessible equipment
Wait at least 5-10 minutes. Look for blocked ventilation openings, cracked conduit, animal damage, water marks, melted connectors, discoloration, and unusual odor without touching suspect components.
Success checkpoint: No visible hazard is present, and the event has been documented before re-energization.
Common mistake: Opening the inverter to clean internal fans or replace parts without electrical training and authorization.
Step 5: Re-energize AC first
Turn on the solar AC breaker or isolator first. Allow the inverter to complete its initial checks before changing the DC switch.
Success checkpoint: The display or local interface powers up without an immediate AC wiring or internal fault.
Common mistake: Switching both isolators rapidly, which makes the startup sequence harder to interpret.
Step 6: Re-energize DC second
Turn on the DC isolator and monitor the startup sequence. The inverter may remain in standby until PV voltage and irradiation meet its starting conditions.
Success checkpoint: The event clears, the inverter reconnects, and the production or status page updates.
Common mistake: Assuming a clear display means the physical cause is fixed. A recurring code is evidence of an unresolved condition.
Do not perform this reset for smoke, burning odor, visible arcing, water inside the equipment, exposed conductors, repeated AFCI trips, or persistent insulation faults. Isolate the area if safe and contact a qualified electrical professional.
Which Faults Can a Homeowner Check?
A homeowner can usually check event timing, portal connectivity, visible ventilation obstructions, router status, and whether a utility outage is affecting the property. Electrical measurements, enclosure opening, connector separation, insulation testing, and parameter changes belong to qualified personnel.
| Symptom | Low-risk owner check | Technician investigation | Escalation level |
|---|---|---|---|
| 101-105 at random times | Compare with utility voltage complaints or outages | AC voltage, impedance, service connection | Utility or installer if persistent |
| 3301-3303 at dawn | Check shade, snow, fog, and time of day | String current and DC connectors | Routine unless midday and persistent |
| 3501 or 3701 | Record weather and isolate as instructed | Insulation resistance and leakage path | High priority |
| 4301 recurrence | Note whether rain or heat preceded it | Torque, crimp, isolator, and cable inspection | High priority |
| 7508 recurrence | Clear external leaves or insects | Fan module, airflow, thermal sensors | Service appointment |
| 10283-10284 | Reboot router and check local Wi-Fi | Network configuration or communication board | Routine if production continues |
| 6406-6438 recurrence | Record repetitions and temperatures | Power stage, relays, control boards | Warranty or service |
A communication fault is often operationally less urgent than a DC safety fault. However, missing portal data can hide a production loss, so the owner should verify local inverter status rather than assuming the array is working.
What Do Fan, Memory, Surge, and Grid Guard Events Mean?
Internal service events require different responses because some affect output, some affect protection, and some affect only configuration or logging. Event 7508 may identify a fan issue on an applicable model, while 7101 may relate to memory or storage; those meanings must be confirmed in the product manual.
| Event example | Component or function | Typical owner action | Typical service action |
|---|---|---|---|
| 6406-6438 | Internal electronics, current, or switching | Stop after permitted single reset | Test power stage and control hardware |
| 7101 | Memory, logging, or storage | Save event history | Check storage and replace approved component |
| 7508 | Cooling fan or airflow | Clear external debris | Test or replace fan module |
| 8301-8302 | AC or DC surge arrester | Do not open wiring box | Replace approved SPD cartridge |
| 8401 | Thermal, control, or system condition on some models | Check ambient conditions | Confirm model-specific diagnosis |
| 9002-9003 | Grid Guard access or locked parameters | Do not guess credentials | Authorized SMA or installer access |
| 10283-10284 | WLAN or communication interface | Reboot router and test signal | Reconfigure network or service interface |
Surge protection components may sacrifice themselves during a transient event. Replacing a cartridge without checking the cause can leave the system exposed to another surge, especially where repeated lightning or utility disturbances occur.
Grid Guard restrictions are intentional. Changing country settings or trip thresholds without utility approval can invalidate the interconnection configuration and create unsafe grid behavior.
How Should You Troubleshoot Communication Errors?
Communication events should be diagnosed separately from energy-conversion faults. If the inverter display shows normal production but Sunny Portal has stopped updating, the likely problem is the local network, data logger, WLAN signal, or cloud path rather than the PV power stage.
Use this order:
- Check whether the inverter’s local display or Web UI reports current power.
- Confirm the router has internet access and that its 2.4 GHz network remains enabled where required.
- Reboot the router, then allow several minutes for the inverter or data logger to reconnect.
- Check cable seating for Ethernet or Speedwire connections without opening the inverter.
- Compare the local time of the last portal update with the inverter event history.
- Escalate if the local interface is unavailable, the communication board is unresponsive, or production also stopped.
Speedwire or Ethernet can be more reliable than weak WLAN through concrete walls. RS485 remains relevant on some legacy installations, but termination, polarity, addressing, and cable topology must match the product documentation.
When Does an SMA Fault Need Immediate Service?
Immediate service is appropriate for ground faults, repeated AFCI trips, DC overvoltage, exposed wiring, burning odor, water ingress, smoke, or a red fault state that returns after one approved restart. A utility-related event can wait for monitoring if the inverter reconnects and no safety symptom exists.
Weather changes the diagnosis
Rain can lower insulation resistance temporarily when a damaged connector or cable absorbs moisture. A fault that appears only after rain and clears after drying still needs repair because water dependence identifies an intermittent weakness, not a harmless event.
Heat can trigger derating, fan faults, or internal temperature alarms. A fault that appears during the daily production peak may indicate inadequate clearance, blocked airflow, or a high-resistance electrical connection.
Cold weather increases PV open-circuit voltage. A DC overvoltage event on a clear, cold morning deserves more attention than a low-power event during fog.
Repetition matters more than a single notification
One grid event during a neighborhood outage may be normal protective behavior. Five identical grid events every afternoon suggest a persistent voltage or impedance problem that requires measured evidence.
One communication interruption may be a router reboot. A communication event combined with zero local production points toward a broader inverter or supply issue.
What Does SMA Troubleshooting Typically Cost?
Typical costs range from $0 for a router restart or weather-related waiting period to $1,400-$3,200 for an out-of-warranty inverter replacement, including equipment and labor. Actual prices depend on location, roof access, warranty status, travel, testing requirements, and the SMA model.
| Service or remedy | Typical parts cost | Typical total or labor range | Typical timeframe |
|---|---|---|---|
| Router or WLAN reconnection | $0 | $0-$150 | 10 minutes-1 day |
| External airflow cleaning | $0-$30 | $0-$180 | Same day |
| Cooling fan replacement | $80-$220 | $180-$450 | 1-3 days |
| SPD cartridge replacement | $150-$350 | $250-$600 | 1-2 days |
| Insulation or earth-fault tracing | $20-$100 test materials | $200-$600 | 2-5 hours |
| AFCI and rooftop DC diagnosis | $20-$150 test materials | $200-$700 | 2-6 hours |
| Inverter replacement | Model-dependent | $1,400-$3,200 | 3-10 business days |
These are typical industry ranges, not SMA quotations. Modern SMA products commonly carry five- to ten-year standard warranties, with extension options that can reach 15-20 years for eligible products. Confirm coverage using the serial number, purchase record, warranty terms, and installer commissioning information.
How Does SMA Compare With Other Inverter Diagnostics?
SMA’s event-number approach gives installers a direct fault identifier, but it does not provide the module-level visibility associated with systems that place electronics on every panel. SolarEdge uses inverter and optimizer diagnostics, while Enphase commonly reports microinverter and gateway status through Enlighten.
| Diagnostic characteristic | SMA string inverter | SolarEdge system | Enphase microinverter system |
|---|---|---|---|
| Primary identifier | Numeric event number and text | Inverter, optimizer, and alert codes | Microinverter, gateway, and cloud status |
| Roof-level granularity | Usually string or array level | Often individual optimizer level | Usually individual module level |
| Local access | Display, Web UI, Speedwire | SetApp and monitoring platform | Gateway and Enlighten platform |
| Main failure consequence | Central inverter can stop array output | Central inverter or optimizer issue varies | One microinverter usually affects one module |
| Best diagnostic strength | Grid and inverter protection events | Panel-level performance comparison | Distributed module monitoring |
| Main limitation | Roof fault location can require string testing | More electronic components on roof | Gateway and communications dependency |
SMA is not automatically better or worse for diagnosis. A central string inverter usually simplifies roof electronics and service access, while module-level systems can narrow a shading or optimizer issue more quickly.
What Information Should You Send to SMA Support?
Send the exact event number, full event text, inverter model, serial number, firmware version, country setting, LED behavior, timestamp, weather, and whether production resumed. Include screenshots from Sunny Portal or the local Web UI and identify whether the event repeats after a controlled restart.
A useful service record contains:
- The first occurrence and most recent recurrence.
- Daily production before and after the event.
- AC and DC isolator positions.
- Recent storms, utility work, roof work, washing, or electrical modifications.
- Photos of accessible equipment, labels, and visible damage.
- The installer’s commissioning documents and Grid Guard authorization details.
- Whether other inverters or household circuits show abnormal behavior.
Do not send guessed measurements. A technician can make better decisions from a precise “not measured” statement than from an unsafe or incorrectly obtained voltage value.
SMA Inverter Error Codes List FAQ
Can an SMA inverter error clear by itself?
Yes, a grid voltage, frequency, or low-irradiance event can clear when operating conditions return to the permitted range. An event that repeatedly returns, remains active at midday, or involves insulation, AFCI, smoke, heat, or visible damage requires investigation rather than repeated resets.
Why does my SMA inverter show an error only after rain?
Rain can expose damaged cable insulation, wet connectors, cracked junction boxes, or water ingress by reducing resistance to ground. A rain-dependent error may disappear after drying, but the pattern remains evidence of a physical defect that can worsen during the next storm.
Can I disconnect SMA solar cables myself?
No. PV cables can remain energized in daylight, and disconnecting connectors under load can create an arc. Owners should use only the labeled AC and DC isolation controls described in the product instructions, while cable separation, electrical testing, and enclosure work require qualified personnel.
Why is Sunny Portal offline while the inverter still produces power?
Sunny Portal can lose data because of a router, WLAN, Ethernet, data logger, or cloud connection problem while the inverter continues converting electricity. Check local inverter power and event history first, then test the network path before arranging inverter hardware service.
How do I find the correct manual for my SMA code?
Read the exact model and suffix from the inverter nameplate, then use SMA’s official documentation for that product and firmware family. Legacy Sunny Boy, Sunny Tripower, battery, and microinverter products can assign different meanings to similar event numbers.
Should I replace an SMA inverter after one hardware event?
No. One hardware-related event may clear after an approved restart, a temporary temperature condition, or a supply disturbance. Replacement becomes more plausible when the event recurs, output remains unavailable, the unit fails diagnostic tests, or SMA and the installer confirm an uneconomic repair.
The Bottom Line
The most reliable SMA inverter error codes list combines the event number with the exact text, model, firmware, timing, weather, and LED state. Grid and low-light events may clear without repair, while DC overvoltage, insulation, residual-current, AFCI, burning, and water-related faults require prompt professional attention. Record first, isolate safely when instructed, and never bypass protection settings or disconnect energized PV connectors. Use this SMA inverter error codes list for triage, then confirm the final diagnosis in the official SMA manual for the installed product.