What do solar inverter error codes mean

Solar inverter error codes notify you of a situation threatening the normal operation of your solar power system. Many different things can go wrong and disrupt electricity generation from a solar PV system. The inverter will detect it and generate corresponding error codes to notify you.

You should be interested in inverter codes because their performance and lifespan are intricately linked to inverter error codes and taking appropriate actions.

In this post, we’ll answer your questions about inverter error codes, including:

  • What is inventor error and error codes?
  • What causes inverter failure?
  • How often do inverters fail
  • What does it mean if your inverter is running hot

We’ll also get into details on the error codes of the Fronius Inverter, Sungrow Inverters, ABB Inverters, and Huawei FusionSolar Inverter.

In the end, we’ll share inverter maintenance tips to prolong the lifespan of your device.

Let’s get started!

What is a temporarily inverted error?

An inverter error is anything that works against its normal running condition. It is an issue from within or outside the solar power system that will negatively affect its performance.

Primarily, inverters convert the direct current that your solar panels produce into alternating current suitable for your home appliances. 

But in these modern times, inverters do more than power conversion.

Modern smart inverters also monitor the performance of solar systems and give real-time reports. 

The term “inverter error” does not mean that the inverter is broken. Yes, the issue could be the inverter, but it can also come from the other solar power system components or factors outside the system.

“Inverter error” is a fitting term because the inverter is the bearer of the error message. 

Once the inverter detects an issue, it generates and displays a code to notify you that something is wrong.

What better term for an error code flashing on your inverter display than “inverter error code”? These codes can be all numbers or a combination of numbers and letters.

Thus, inverter error codes are numeric or alphanumeric characters generated and displayed by inverters to notify the owner that something is wrong with the solar power system.

For example, when the internal temperature is too high, the inverter may shut down to protect its internal electronic components. Different situations can make the internal temperature intolerably high.

But the inverter will not leave you guessing. It will detect the particular reason, then generate and display the code for the particular reason. After seeing the error code, you or your installer will know the problem and solution.

For example, if using a Sungrow inverter, the 070 error code tells you that the inverter is heating up because of a defective fan. But the 037 error code tells you that the inverter is heating up because it is in a poorly ventilated spot, exposed to direct sunlight, or its air inlets are blocked.

What causes inverter failure?

Inverter failure can be caused by problems with the inverter itself (like worn out capacitors), problems with some other parts of the solar PV system (like the panels), and even by problems with elements outside the system (like grid voltage disturbances). 

An inverter failure is when the inverter develops faults that cause improper functioning. Some of the common reasons for inverter failure are:

  • Worn out capacitors
  • Ultrasonic vibrations
  • Faulty Installation
  • Over-current and over-voltage
  • Inverter overload

Let’s delve into these issues.

Worn out capacitors

Electrolytic capacitors in inverters are temperature-sensitive. High temperature causes the electrolytes to evaporate, which wear out the capacitor. Worn out capacitors fail to limit fluctuations to provide stable DC voltage, which can cause inverter failure.

If you run inverters at a lower than usual operating temperature, you limit the evaporation of electrolytes, which improves the lifespan of the capacitors and the inverter.

Also, regularly replacing worn-out capacitors will help you prevent failed capacitor problems and inverter failure.

Ultrasonic vibrations

Another cause of inverter failure is mechanical stress on the inverter caused by ultrasonic vibrations occurring in the cores of inductive parts. These vibrations cause friction which increases the heat generated by the device, causing inverter failure.

Note that the inverter’s normal working causes the ultrasonic vibrations, so limiting these is not an option.

Rather, you should protect your inverter from heating up to intolerable levels. Ensure that the inverter fans are working, that the air inlets are not blocked, and that the device’s location is well ventilated.

Faulty Installation

Another common cause of inverter failure is faulty installation. Anything that the installer does wrong will often cause the inverter to fail.

The list of installation errors is endless. For example, connecting the inverter backwards can blow the inverter and set the house on fire. Using wrong cables can cause unnecessary inverter shutdown when high demand loads are trying to operate. Using the wrong cable types are also a potential fire hazard.

The only way to prevent faulty installation is to avoid using novices and instead engage experienced and reputable installers like Instyle Solar.

Over-current and over-voltage

Current that rises above the current rating of the inverter can cause damage to specific components, especially the inverter bridge. The same thing goes for voltage. Current or voltage spike can also increase the heat generated by the inverter, leading to failure.

You can prevent over-current by using fuses and circuit breakers. Avoiding overvoltage is a lot trickier and depends on the situation causing the overvoltage.

Inverter Overload

Overloading an inverter is simply connecting loads that exceed its rated power.

Inverters without overload protection will get damaged if you overload them. But, for inverters that come with built-in overload protection, overloading can cause the inverter to heat up. The added heat can damage components and cause inverter failure.  

You can prevent inverter failure resulting from overload by simply avoiding connecting high power equipment like water pumps, refrigerators, and microwaves simultaneously. 

How often do inverters fail?

Because different situations can cause inverter failure, an inverter will fail as often as those situations occur. This is usually very often.

Regular maintenance will prevent some of the situations that cause inverter failure and improve the lifespan of your inverter. But generally, solar inverters don’t outlast solar panels.

While solar panels have a 25 – 30 years lifespan, solar inverters have about 10 – 15 years. This is because of the limited lifespan of the electrolytic capacitors of inverters. 

So, you may want to budget for inverter replacement at least once in the lifetime of your solar power system.

What does it mean if my inverter is running hot?

If your inverter is running hot, it would mean that the fan is not working properly, the inverter has poor ventilation or is overloaded, or the ambient temperature is too high.

Power generation creates heat, so your inverters will get warm. However, like all semiconductor-based equipment, inverters operate best at cooler temperatures. If they heat up, they lose efficiency and can be damaged. 

Ensure that the cooling fan works properly, the inverter is well ventilated, the load is not too heavy, and the surrounding environment is not too hot.

Let’s take a closer look at these.

Cooling Fan. Every inverter comes fitted with cooling fans. The fan rotates while the inverter runs to blow cool air onto temperature-sensitive components and dissipate warm air.

If the fan is damaged, the inverter heats up. So, if you notice that the fan is not rotating when your inverter is running, call a technician to replace the fan. Ensure to engage professionals like Instyle Solar; not novices that may cause more trouble.

Ventilation. Every inverter comes with air ducts. These spaces allow hot air to leave the internal environment while cooler fresh air gets in. If the inverter is not well ventilated, it heats up.

Dust is one thing that can block air inlets, causing your inverter to heat up. It’s rampant in the summer months, but you can prevent this by regularly dusting the exterior of the inverter to open up the air ducts.

Physical barriers can also block the air ducts and cause ventilation issues. So, choose the inverter location wisely. 

For example, it should be in a place with lots of circulating fresh air. It should not be placed such that air ducts are against the wall.

Also, even if the device is properly located, you should ensure that you don’t block the air ducts with clothes or tools.

Load. As mentioned earlier, continuously overloading an inverter will cause the inverter to heat up and fail.

So if your inverter is running hot, try to reduce the load. Better still, increase the capacity of your inverter.

Ambient Environment. A hot environment will cause the inverter to heat up faster. So you need to keep the temperature of your inverter’s immediate surroundings cool.

One practical measure you can take is to ensure that the inverter is not exposed to direct sunlight. Though outdoor inverters are designed to withstand direct sunlight rather than indoor inverters, you may want shades/ covers over outdoor installations. You can keep the environment of indoor inverters cool with air conditioners and fans.

Also, in multi-inverter installations, ensure that there is enough clearance between the devices so that the heat from one device does not make the immediate environment of the other device too hot.

Fronius Inverter error codes

Fronius Inverters mostly display error codes using numeric characters. However, a few are displayed in plain text. Fronius inverters group their error codes into five classes. 

We’ve previously covered a few Fronius Inverter error codes

Here, we’ll have a detailed review of Fronius Inverter error codes.

Class 1 errors codes

These codes start with the number 1. The 1xx errors are typically temporary caused by the main grid. 

When any of them occurs, the inverter temporarily disconnects from the grid.

The inverter then thoroughly checks/ tests the grid for a stipulated period. The inverter will automatically resume operation and feed the grid if grid conditions return to the acceptable range. 

Error CodeDescriptionRemedy
102AC voltage too highCheck the grid connection, fuses and breakers. 
Disconnect if the inverter has not automatically disconnected from the grid.
Should the error code continue, contact your system installer?
103AC voltage too low
105AC frequency too high
106AC frequency too low
107No AC grid detected
108Islanding detected (disconnected from the grid)
109General grid error.109 is the first error code displayed for grid errors. After reviewing all power sets, the grid error is specified in more detail or remains at 109.

Class 2 error codes

These codes start with the number 2. They are also temporary errors caused by the grid.

If a 2xx code occurs, the inverter also automatically disconnects from the grid and checks to make sure that conditions have returned to the acceptable range before automatically reconnecting.

Error CodeDescription Remedy
202Grid voltage exceeds admissible limitsCheck your grid voltage. If the error doesn’t disappear, contact your system electricity provider.
203Grid voltage below admissible limits
207No grid voltage detectedCheck grid connection and fuses. If the error persists, contact your electricity provider.

Class 3 error codes

These codes start with the number 3. They are caused by the interruption of power feeding into the grid. 

However, they don’t indicate equipment failure or cause a permanent interruption of the feed-in operation. The inverter disconnects from the grid and, after a stipulated period, try to resume feeding power to the grid.

Error CodeDescriptionRemedy
301Short interruption of power going to the grid due to overcurrent (AC)Voltage drops on the public mains usually cause these. They automatically fix themselves in no time. However, if they persist, contact your installer.
302Short interruption of power going to the grid due to overcurrent (DC)
303Problem with an over-temperature buck converter. Short interruption of power going to the grid due to over temperatureImprove the ventilation of the inverter.
Clear air inlets, remove whatever obstructs the free circulation of air, change inverter location to a cooler environment or use forced cooling measures.
If the error persists, contact your installer.
304Problem with an over-temperature cooling element.
305No power is transferred to the grid.Restart the system. 
If the code persists, contact your installer.
POWER LOW (306)The code appears in plain textIntermediate circuit voltage has dropped below the allowed threshold value for feed in. Check solar panels. This code typically appears in the morning or evening when sunlight is low. 
So it’ll fix itself automatically when there’s sufficient sunlight.
If it persists, contact your installer.
DC LOW (307). This code appears in plain text.DC input voltage is too low for feed-in.
308Intermediate circuit voltage is too highThe inverter returns to the start-up phase. The error is rectified automatically. If it persists, contact a Fronius technician.  

Class 4 error codes 

These are codes beginning with the number 4. The 4xx errors are caused by faulty hardware or software. So they require the services of a trained Fronius service technician.

Error CodeDescriptionRemedy
401No internal communication with the power stage setThe inverter will automatically fix the problem by reconnecting and resuming feeding power to the grid. 
If that doesn’t work, contact a Fronius-trained service technician.
402Communication with EEPROM (internal Fronius memory) is not possible.
403EEPROM (specifically, the part for country setting) faulty
406The temperature sensor on the DC-AC board is faultyThe inverter disconnects from the grid for safety reasons. Call a Fronius technician.
407The temperature sensor on the DC-DC board (temperature sensor at cooling element) is defective. 
408Direct current feeding into the grid detectedPublic mains disturbances cause this. It is rectified automatically. If not, contact a technician.
412You’ve set a “fixed voltage” setting instead of the MPP voltage setting, and the voltage is lower or exceeds allowed limits.If the error persists, contact a Fronius technician.
413Control problems If AC voltage and frequency are out of range, the inverter disconnects from the grid. It’s rectified automatically. If not, contact a technician. 
414Memory array for Fronius IG type in EEPROM is faultyIt’s a one-off memory error that is rectified automatically. If it doesn’t, there’s an internal fault, and you should contact a Fronius technician. 
416Communication with the IG Brain is not possibleIt’s a one-off communication problem. Restart the system. If that doesn’t fix it, call a technician.
417Hardware ID collision (two power stage sets have similar PCB numbers)The operating status LED lights up red to indicate a critical error.
Contact a trained Fronius service technician immediately.
419Two or more power stage sets have similar software serial numbers. 
421Hardware ID sequence error (PCB number has been incorrectly set)
425Communication is not possible with the power stage setThe operating status LED lights up orange.The system will attempt a restart to fix the error automatically. If it persists, contact a technician.
431Software problem (power stage sets are all in boot mode)This is a critical error fixed by conducting an AC reset or/ and firmware update.Switch AC circuit breaker on and off. If code persists, update firmware using Fronius Solar.update/IG Plus or Bootloader.
439. (plain text) switching between “SLAVE/ DC LOW” and “SLAVE/ POWER LOW” SLAVE/ DC LOW – The MPP master power stage set is switched off because of an error in a slave power stage setSLAVE/ POWER LOW – the MPP master power stage set is switched off because of a faulty GFDI fuse For the faulty GFDI fuse, you can try replacing it. However, this is a critical error that needs the attention of a Fronius technician.
442Phase master for one phase is not detectedA temporary miscommunication that should fix itself automatically. If not, contact a technician.  
443Energy transfer failure because intermediate circuit voltage is too low or asymmetricA temporary error that occurs when switching on a power stage set.It’ll fix itself automatically. If not, restart the system, and if it persists, contact a technician.
445Invalid power stage set configurationUpdate firmware. Better still, contact a technician.
446The NL-MON plug-in card has an internal communication error Check the grid connections and fuses.
447The NL-MON plug-in card is interrupting grid monitoringContact a Fronius professional.
448Neutral conductor is disconnected
450The “guard” (power stage set main processor) cannot be foundThese are critical errors that make the red operating status LED flash up.Try restarting the system. If that doesn’t fix the error, contact a Fronius technician.
451The EEPROM Guard Control is faulty
452Interrupted communication between guard and DSP (digital signal processor)  
453Error in grid voltage recording (power stage set does not match grid voltage)
454Error in grid frequency recording (power stage set does not match grid frequency)
455The AC measurement reference power source is outside tolerances.
456The anti-islanding function is not working properly.
457The grid relay is stuck 
460Reference power source for the DSP is working outside tolerance levels.
461DSP data memory has an error
464Display error (the hardware or software version of the display or both is not compatible with IG brain)Restart the system. If that doesn’t clear the error, update firmware using Fronius Solar.update/IG Plus or Bootloader. 
465Display error (the current display version does not recognise the UI command sent from the IG brain) 
466The display is undetectedCheck the display to see if it’s damaged. Connect display, check ribbon wire for damage. Check IG brain for damage.
If the error code persists, contact a Fronius-trained technician.
467The display has not received the IG brain’s start command for more than 6 seconds.The inverter will try to fix the problem by reconnecting again automatically.
469Throttle not properly connectedConnect the throttle to the right poles. If the code persists, engage a Fronius professional. 
470At high DC voltage, the buck converter relay does not open Check the system configuration. If the error continues appearing, engage skilled technicians.
472Ground fault detected. That is, one of the current-carrying solar module or DC conductors interconnect cables are touching a grounded component.Check the GFDI fuse to replace if necessary. Engage the services of skilled technicians. 

Class 5 error codes 

These are codes beginning with the number 5. Generally, these errors do not affect feed-in operation. While the error code is displayed, the inverter will continue working normally.

Acknowledge the error code by pressing any key, and it will disappear. However, know that clearing the code does not solve the problem it notifies you about. 

Error CodeDescriptionRemedy
501One of the fans is defective, causing the temperature in the system to be too high.Clear air inlets, keep the ambient temperature as low as possible.Also, engage the services of a professional for fan replacement. 
504Solar Net communication is not possible. It happens when the inverter address is issued twice.Change inverter address
505Data from the Setup menu in the EEPROM is lostThis is rectified automatically 
506Data from the “Total” menu in the EEPROM is lost
507Data from the “Day/ Year” menu in the EEPROM is lost.
508Inverter address is incorrectSet address
509No feed-in operation for the last 24 hoursIt could be because solar panels are covered with snow. Remove the snow.
510 SMS settings restored to defaultReconfigure SMS
511Sensor card settings restored to defaultReconfigure metering channels
512Too many power stage sets were detected in the systemContact a professional technician.
513The power stage set is in boot mode, preventing activationUpdate the power stage set firmware
514One of the power stage sets is not working properlyContact a service technician.
515The temperature sensor on a cooling element is faulty or not properly connected.
516The system cannot activate the power stage setsAnalyse the “Set up” menu section. If the error persists, contact a technician.
517Changed masterCheck that the transformer is connected, the bridge has not short-circuited, and there’s no intermediate circuit voltage damage. You may also want to invite a technician.
550Defective string fuse Measure string fuses and replace defective ones.
553Phase master is deactivated due to frequent errors The system will automatically reintegrate the power stage set into the Mix network.If the error persists, contact a Fronius technician.
554NL-Mon EEPROM error (Automatically restored default set switch off limitsGo to the “Advanced” menu to redo system-specific changes
558A feature is deactivated (possibly after replacing a component) Confirm error, and update firmware using Bootloader or Fronius Solar.update/IG Plus

Sungrow Inverter error codes

The error codes of Sungrow Inverters are displayed in numeric characters only. 

We’ve also previously explored some Sungrow Inverter error codes. But here, we’ll look at a more comprehensive list of codes, including what they mean and troubleshooting tips. 

Error CodeDescriptionTroubleshooting
002The grid’s voltage exceeds the inverter’s acceptable upper limitCheck the grid voltage.
If it exceeds the acceptable range of the inverter’s protection parameters, contact your electricity provider for assistance.
If it’s within the acceptable range, contact Sungrow Service Department for assistance.
003The grid transient voltage exceeds the inverter’s acceptable upper limit It is a temporary error that the inverter will automatically rectify. If it persists, contact Sungrow.
004The grid voltage is below the inverter’s acceptable lower limitCheck the grid voltage. Contact the grid for assistance if it is not within the inverter’s protection parameters. If it is within the acceptable range, contact the Sungrow service department for assistance.
005The grid voltage is too low, even lower than in code 004It is a short-term error due to grid conditions. The inverter will automatically rectify it as grid conditions improve. If it persists, contact Sungrow. 
006The AC output current exceeds the inverter’s acceptable upper limitThe inverter resumes if the output current falls within the acceptable range. If the error persists, contact Sungrow.
007Transient AC over-currentThe inverter will resume in a few seconds. If it doesn’t, contact Sungrow. 
008The grid’s frequency exceeds the inverter’s protective upper limitCheck the grid frequency. If it exceeds the inverter’s allowable range, contact the grid company for a solution. But if it is within the range, contact Sungrow.
009The grid frequency is below the inverter protective lower limit.
010IslandingCheck whether the AC circuit breaker is triggered, whether AC cables are firmly connected, and whether the grid is out of service. If the 3 conditions are OK, but the code persists, contact Sungrow.
011The DC injection of AC  exceeds the inverter’s acceptable upper limitWait for the inverter to recovery. If the error persists, contact Sungrow.
012The leakage current exceeds the acceptable upper limitCheck PV strings for ground faults. If the error persists, contact Sungrow. 
014The average grid voltage within 10 minutes exceeds the acceptable rangeCheck whether the inverter country is correct.
Check the voltage of the grid. If it exceeds the acceptable range, contact your utility grid company.
If the error continues, contact Sungrow. 
015The grid voltage is too high, even higher than in code 002Check the AC cables model. Wait for the inverter to fix the error automatically.
If it doesn’t, check that the grid voltage is within the acceptable range.
If it isn’t, contact the utility grid company, but if it is, contact Sungrow. 
016The bus voltage or power is too highWait for the inverter to fix itself automatically. If it doesn’t, contact the Sungrow service department.
019The transient bus voltage is beyond the acceptable range.
020The bus voltage is beyond the acceptable range.
021PV1 input over-currentCheck the wiring and layout of PV1
022PV2 input over-currentCheck the wiring and layout of PV2
028Reverse connection in PV1 circuitCheck the PV1 cable connections
029Reverse connection in PV2 circuitCheck the PV2 cable connections 
036The radiator temperature is too highCheck if the ambient temperature is excessively high, air circulation is good, the inverter is in direct sunlight, the fan is working properly, and clean the air inlets.
If the fault persists, contact Sungrow. 
037The inverter’s internal temperature is too high
038Relay fault is detected on the grid sideWait for the inverter to fix the error automatically. If it doesn’t, contact Sungrow.
039The PV to earth insulation resistance is lowCheck that there’s a reliable grounding line and if one of the PV strings is not short-circuited with the ground. After this, the inverter should fix itself automatically. If it doesn’t, reach Sungrow for a solution.
041Leakage current sampling faultWait for the inverter to rectify the issue automatically. If it doesn’t, call Sungrow. 
043The inverter’s inner ambient temperature is excessively lowThe inverter will rectify once the ambient temperature rises above -25℃.
044Inverter self-test errorWait a moment for inverter recovery. If the error continues, contact Sungrow.
045PV1 boost circuit error
046PV2 boost circuit error
048Phase current sampling fault
053Slave DSP detects that grid voltage is above the acceptable inverter upper limit.Check the grid voltage. If it exceeds the acceptable inverter limit, contact your utility grid company.
But if within limits, contact Sungrow.
054Slave DSP detects that grid frequency is above the acceptable inverter upper limit.Check the grid frequency.
If it exceeds the acceptable inverter limit, contact the utility grid company for a solution.
But if within limits, contact Sungrow.
056The Slave DSP detects that leakage current is beyond the acceptable inverter upper limit Check if there’s a grounded fault of the PV string. If the error persists, contact Sungrow.
059Communication problem between the master and slave DSPsThe inverter should fix itself in 1 minute. If the error continues, contact Sungrow.
061Warning for no inverter typesettingPlease contact Sungrow. 
070Fans are not working properlyStop the inverter, then disconnect the DC and AC cables. Check if the fan duct is blocked. Replace the fan if not.
084Sungrow meter’s cable connection is reversed Check that power cables are connected correctly. If “Existing Inverter” is “ON” via LCD menu, ensure that its rated power is set correctly. For Sungrow single-phase meter, check that the CT clamp of the 1-phase sensor is placed correctly
085Software version not compatibleContact Sungrow
087The arc detection module is abnormal
088Arc fault on PV sideTurn the DC switch “OFF,” then check if there are no damaged cables, fuses, or loose terminals. Replace if necessary. Turn the DC switch “ON,” then clear the error via iSolarCloud or the LCD menu. If the error persists, contact Sungrow
089The disabled arc detection functionEnable it via iSolarCloud or the LCD menu. If the error persists, contact Sungrow.
100AC output surpasses the inverter’s upper thresholdThe inverter will recover if the output current falls within the acceptable range
101Grid frequency is too high, even higher than that in code 008Check the grid frequency. Contact your utility grid company if it’s not within the inverter’s acceptable range.
But if it’s within the acceptable range, contact Sungrow for help. 
102Grid frequency is too low, even lower than that in code 009
106Both the PE terminal on the AC connection and the second PE terminal on the enclosure are not connected well) Check whether there’s a reliable grounding line. If there’s access to the ground, and the error persists, contact Sungrow.
200The bus voltage is beyond the acceptable rangeThe error is rectified automatically when bus voltage drops. If the error continues, contact Sungrow.
201The bus voltage is excessively lowWait for the inverter to recover. If the error continues, contact Sungrow.
202Either PV1 or PV2 current surpasses the acceptable rangeContact Sungrow if the error persists
203PV input voltage is beyond the bus voltageCheck the PV connection terminals
306Mismatch in input and output power Contact Sungrow 
315PV1 current sampling problem
316PV2 current sampling problem
320Leakage current sensor is faulty
409All temperature sensors have failedIf the error persists, contact the Sungrow service department
503Open circuit at the ambient temperature sensor 
504Short circuit at the ambient temperature sensor 
505Open circuit at the radiator temperature sensor  
506Short circuit at the radiator temperature sensor 
514Abnormal communication of the Sungrow meterCheck that the meter’s power cable is connected correctly.

ABB Inverter error codes

ABB Inverters combine two systems when displaying errors. In addition to the operating status LED that flashes, they show an error code together with an error message. While the error message is in plain text, the error code is in alphanumeric characters.

We’ve previously covered a few of the ABB Inverter error codes. Now’s time for full coverage of these codes, including their meaning and solutions.

The error codes of ABB Inverter can be grouped into 3.

The First Group

Only the error message accompanies the LED signal; no code is displayed. 

Error CodeError MessageDescription Solution
No codeRed LEDGround FThere’s a DC leakage to groundGet a megohmmeter to measure the insulation resistance in the PV field compared to the ground (you must take the measurement under the same environmental conditions that the error occurred)If the value is lower than one megaohm, call a technician for a check. If it is higher than one megaohm, the error should clear automatically. If it doesn’t, contact ABB customer service.
No codeYellow LED lampNEW COMPONENT REFUSED!Usually occurs after one of the components in the inverter is replacedLink the components by going to “Settings > Service > Accept boards”.If the error persists, contact customer assistance.
No codeNo LEDSET COUNTRY or NO NATIONDuring installation, you didn’t set the inverter’s grid standardSet the country’s grid standard. If the error persists, contact customer service.
No codeYellow LEDVac absentThe inverter does not record output voltage (AC)Check that there’s grid voltage on the inverter’s AC terminal block. If absent, look out for protection work on the line and grid voltage on the supply point.
No codeYellow LEDMem. brokenThere’s a communication fault on the memory board where the inverter saves the value of the power produced daily.Remove the memory board the check the welding work on all the connector’s terminals. Then correctly reinsert the memory board. If the error is not fixed, contact customer service.
No codeGreen LED lampAwaiting sunThe voltage from the PV generator is lower than the activation voltage (Vstart).Check that the input voltage on the inverter does not exceed Vstart, then check if there’s sufficient irradiation. If it surpasses Vstart, contact customer service. 

The Second Group

Both an alphanumeric error code and a plain text error message accompany the LED display in this group. However, the distinctive feature of the second group is that the error codes begin with the letter W. They are warnings.

Error CodeError MessageDescription Solution
W001Sun LowInsufficient irradiation (low input voltage after switching on the inverter)Check the input voltage on the inverter. 
If it exceeds Vstart, check (1) for the presence of sufficient irradiation, (2) the PV generator and the inverter’s minimum input voltage are correctly configured. If the input voltage exceeds Vstart, contact customer service.
W002Input UVInsufficient irradiation (low input voltage after switching off the inverter)
W003Grid failParameters of grid voltage are outside the inverter’s acceptable range Check if the grid voltage on the inverter is present. If not, check for the absence of grid voltage on the supply point. If present, but too high, or too low, contact the operator to change the grid’s parameters. Contact ABB customer service if the grid voltage and frequency are within the inverter’s range.  
W009Empty Table The characterisation board for the wind generator is not compiled (for wind models) Contact customer service
W010Fan broken!The fan is not working properly.
W011Bulk UVInternal unchangeable thresholdRaise (Vstart) – the value of the activation voltage.
Check the input voltage on the inverter. If it doesn’t exceed Vstart, check for sufficient irradiation and the system’s correct composition. If it exceeds Vstart, contact customer service.
W012Batt flatThe voltage for the buffer battery is extremely lowCorrectly set the date/ time. Switch off the inverter and wait a few minutes. Then restart the inverter and check if the date/time are correctly set. If they reset to 01/01/2000, carefully replace the battery with the inverter completely switched off.
W013Clock brokenThere is a difference of over 1 minute in the time displayed and the internal time of the microprocessors. This indicates that the clock circuit is faulty.If the error persists, contact customer service.
W017String Err.One or more string protection fuses are damaged, causing an error when measuring string current.Use a multimeter to check the state of the fuses. If any is open, replace them, and check that the input current of the string doesn’t surpass the rating of the fuses. If there are no damaged fuses, contact customer service.
W018SPD DC ErrDamaged overvoltage surge arresters are positioned on the DC sideCheck the inspection window on each surge arrester. If it’s red, the surge arrester is damaged, and you must replace the cartridge. Contact customer service if they are all green, but the error persists. 
W019SPD AC ErrDamaged overvoltage surge arresters are positioned on the AC sideDamaged overvoltage surge arresters are positioned on the AC side check the inspection window on each surge arrester. If it’s red, the surge arrester is damaged, and you must replace the cartridge. Contact customer service if they are all green, but the error persists. 
W022Reactive power mode changedThe means of managing reactive power variesMake the change through the inverter display or the advanced configuration software.
W023Date/ time changedVariation of the inverter’s date and time
W024Energy data resetThe statistical power data memorised in the EEPROM all becomes zeroReset the energy data saved from the inverter display or the configuration software.

The Third Group 

This group also features alphanumeric error codes and error messages. Unlike the second group, they are not mere warnings; they are errors. So, each error code begins with the letter E.

Error CodeError MessageDescription Solution
E001Input OCThe inverter’s input current surpasses the inverter’s acceptable upper limit.Check the composition of the PV generators. Check that the configuration of the inputs is done correctly. If both checks are positive, contact customer service.
E002Input OVThe inverter’s input voltage surpasses the inverter’s acceptable upper limit.Using a voltmeter, measure the input voltage inside the inverter. If it’s higher than the upper limit of the inverter’s acceptable range, check the configuration of the PV generator. If it is within range, contact customer service as there could be some internal malfunction.
E003No parametersThe main microcontroller can’t correctly initialise the two DSPs due to a communication problem on the inverter’s internal bus.Switch off the inverter and restart it. If the problem persists, contact customer service.
E004Bulk OVThe voltage at the head of the bulk capacitors surpasses the overvoltage threshold.Check the inverter’s input voltage. Should it be close to the input OV threshold, review the configuration of the PV generator.
But if grid voltage disturbances cause the error, the inverter will automatically rectify it when grid conditions stabilise. 
E005Comm.ErrorThere are communication issues between the control devices inside the inverter. Switch off the inverter and restart it. If the problem persists, contact customer service.
E006Output OCOutput overcurrent. The inverter’s output current surpasses the acceptable upper limit.
E007IGBT SatOne of the inverter’s active devices is saturatedThe inverter will try to fix the problem automatically. It could sometimes be caused by an internal malfunction and require customer service assistance.
E009Internal ErrorError inside the inverterSwitch off the inverter and restart it. If the problem persists, contact customer service.
E010Bulk LowLow bulk voltage (DC-DC circuit)Contact customer service
E011Ramp FailLong start-up time for the Booster (DCDC circuit regime) Restart the inverter. If the error persists, contact customer service.
E012DcDc FailError with the operation of the Booster
E013Wrong ModeIncorrect configuration of inputs (they are set in parallel instead of independent)Check the “IN MODE” switch setting and that the bridges between the two input channels have been included. If configurations are correct, check that all is correct with the input strings. If everything is fine, contact ABB customer service.
E014Over-TempVery high temperature inside the inverter. It’ll occur if the external temperature is over 60°CEnsure that the inverter isn’t exposed to direct sunlight. Contact customer service if the error persists after the ambient temperature has returned to an acceptable range.
E015Bulk Cap FailBreakdown on the bulk capacitorRestart the inverter. If the error persists, contact customer service.
E016Inverter FailError in the inverter circuit (DC-AC side) recorded by the booster
E017Start TimeoutLong start-up time for DC-AC circuit regime (inverter) Contact customer service
E018Ground FaultA leakage current to the ground is detectedMeasure the insulation resistance. If the value is lower than 1 megaohm, call a technician for a check. The error will automatically be rectified if it’s higher than 1 megaohm. If it persists, call customer service.
E019Leak sense failFailure of self-test to measure leakage current (DC side)Restart the inverter. If the error persists, contact customer service.
E020Self Test Error 1Failure of self-test to check the correct operation of the booster relay
E021Self Test Error 2Failure of self-test to check the correct operation of the inverter relay
E022Self Test Error 4The execution time for the self-tests carried out on the relays inside the inverter is extremely high.
E023DC in errorThe current continuously supplied to the grid exceeds the threshold of 0.5% of the normal operating current.A sporadic repetition of the error is a sign of grid distortion. So, it is automatically rectified when conditions normalise.
But a systematic repetition of the error indicates a breakdown of the inverter. So you’ll need to call customer service. 
E024Internal errorError inside the inverterRestart the inverter. If the error persists, contact customer service.
E025Riso LowThe insulation resistance is very lowMeasure the insulation resistance. If the value is lower than 1 megaohm, call a technician for a check. The error will automatically be rectified if it’s higher than 1 megaohm. If it persists, call customer service.
E026Vref ErrorThe internal reference voltage is outside the rangeRestart the inverter. If the error persists, contact customer service.
E027Error Meas VError in the internal grid voltage measurement 
E028Error Meas FError in the internal grid frequency measurement
E029Mid Bulk OVInternal overvoltage on the mid bulk measurement
E030Error Meas leakError in the reading of leakage current of the PV generator 
E031Error Read VOutput relay damaged. The voltage difference between the input and output of the grid connection relay is too much. 
E032Error Read IImbalanced output current
E033UTHLow ambient temperature: Temperature outside the inverter is below -25°CWait for the ambient temperature to rise to the operating range.
E034Interlock fail“IGBT” circuitry is not readyRestart the inverter. If the error persists, contact customer service.
E035Remote OffThe inverter has been switched off remotely and is awaiting the “remote ON” commandSwitch on the inverter. If it does not come on, disable the remote off/on the button. If the problem persists, contact customer service.
E036Vout Avg errorThe average of the measurements of grid voltage (sampled every 10 minutes) falls outside the acceptable rangeCheck the grid voltage in the inverter connection point. Contact the operator to adjust grid voltage if it’s outside the acceptable range. But if it’s within range, contact customer service.
E037Riso LowLow insulation resistance Correct the contact between the two terminals of the grounding resistance installed inside the inverter.
Measure the insulation resistance. If the value is lower than 1 megaohm, call a technician for a check.
The error will automatically be rectified if it’s higher than one megaohm. If it persists, call customer service.
E046String self-test FailAn inverted string is recorded during the automatic check of the string voltages.Check the polarity of the strings recorded as inverted.
If all the strings have been correctly connected, activate the system.
If the error persists, contact customer support. 
E049AC FF ErrorError in the “AC feed-forward” circuitRestart the inverter. If the error persists, contact customer service.
E056Over-Temp (from the external box)High internal temperature. Ensure that the inverter isn’t exposed to direct sunlight. Wait for ambient temperature to return to the acceptable range. If the problem persists, contact customer support.
E057Vbulk reading errorInput voltage exceeds the bulk voltage (voltage on the DC-DC circuit inside the inverter)Get a voltmeter to measure the input voltage inside the inverter. If it’s higher than the acceptable operating voltage, check the configuration of the PV generator. If it is within the acceptable range, contact customer support, as the alarm may indicate internal malfunction.
E058Pin vs Pout check errorThe difference between input power and output power is greater than the inverter’s imposed limit.Restart the inverter. If the error persists, contact customer service.

Huawei FusionSolar Inverter error codes

Huawei FusionSolar Inverters uses numeric characters only for their error codes.

We’ve previously treated some of the common Huawei Inverter error codes. Here’s a more comprehensive list of the error codes.

Error CodeDescriptionPossible CauseSuggestion
103High DC input voltageThe PV array is not properly configured, causing the PV string open circuit voltage to exceed the inverter MPPT voltage maximum value. Reduce the PV modules connected in series to strings until the open-circuit voltage falls within the acceptable range.
106 – 113Abnormal string 1 – 8The PV string has been shielded from sunlight for a long time or is damaged.Check if the PV string current is lower than the current of other PV strings. If so, check if the PV string is shielded from sunlight. If not shielded, check whether a module is faulty. 
120 – 127String 1 – 8 reversedThe PV string is connected reversely.Only a few PV modules are connected to the PV string in series.Correct PV string connection if reversely connected. Increase the number of PV modules connected in series to the inverter.
200Abnormal DC circuitThe protection for the DC circuit is triggered. This occurs if the inverter input accidentally disconnects, the three phases of the grid become unbalanced or if there’s a fault on a circuit in the inverter.Turn off the AC output switch, then the DC input switch. Turn them on after some minutes. If the error still remains, contact Huawei technical support.
202Abnormal Inverter circuitThe grid voltage drops abruptly, or the power grid is short-circuited.
OR
The DC in the power grid exceeds the upper threshold
OR
The inverter output is short-circuited.
The inverter automatically resumes if conditions stabilise.
If it doesn’t check inverter output for short-circuits. If the error still remains, contact Huawei technical support.
301Abnormal Grid VoltageThe grid voltage falls outside the inverter’s acceptable range The inverter automatically recovers if grid conditions stabilise. Check that grid voltage is within an acceptable range. If it isn’t, contact the power operator, but if it is, contact Huawei support.
305Abnormal Grid FrequencyThe actual grid frequency falls outside the inverter’s acceptable rangeThe inverter automatically recovers if grid conditions stabilise. Check that grid frequency is within the acceptable range. If it isn’t, contact the power operator, but if it is, contact Huawei support.
313Low Insulation ResistanceThere’s s short circuit between the PV string and the PGND cable.Check impedance to confirm short circuit, and rectify it. If the impedance is lower than the default for a cloudy day, set the Insulation Resistance Protection. 
318Abnormal Residual CurrentThe insulation resistance against the PGND cable (at the input side) decreases when the inverter runs.Check whether the impedance between the PV string and the ground is excessively low. The inverter should automatically recover.
321Cabinet OvertemperaturePoor ventilation. The ambient temperature is too high. The fan is not working. Improve ventilation. If ventilation and ambient temperature meet requirements, contact Huawei support.
326Abnormal GroundingThe neutral wire or PGND cable does not connect to the inverterCheck that these properly connect to the inverter.
400System faultAn unrecoverable fault occurs on a circuit inside the inverterTurn off the AC output switch and then the DC input switch. Turn them back on after 5 minutes. If the error code persists, contact Huawei technical support.
410Abnormal Auxiliary PowerThe internal power chip of the sampling control board is faultyThe inverter will automatically rectify the problem. If not, contact Huawei support.
411AFCI Self-Check failureAFCI check failsTurn off the AC output switch and then the DC input switch. Turn them back on after 5 minutes. If the error persists, contact Huawei technical support.
412DC Arc FaultThe PV string cable is in poor contact or with open circuitsReconnect the cable
504Software Version UnmatchThe version of the software loaded during inverter software upgrade is incorrectUpgrade the software to the correct version.
505Upgrade FailedThe upgrade does not end normallyPerform the upgrade again
506License ExpiredThe license has entered its grace period or will soon expireLoad the new license
61440Flash FaultThe flash memory is insufficient or has bad sectorsReplace the monitoring board. If it’s built into the monitoring device, replace the device.

Do solar inverters need maintenance?

Solar inverters are designed so that they require little to no maintenance. However, like every other home appliance, using your solar inverters with care will make them function optimally and last longer.

Here are a few maintenance tips for solar inverters.

  • Place your inverters in a shaded and well-ventilated place to prevent heating up.
  • Keep the ambient temperature cool. You may use forced cooling measures like air conditioning and fans.
  • Clean regularly. Dust can block air inlets and prevent the free escape of hot air from inside the inverter. So, ensure that you clean the inverter and free up air inlets.
  • Avoid overloading the inverter. Ensure that the appliances you connect simultaneously do not exceed the inverter’s capacity.
Finger points at LED display on solar inverter

Conclusion

Inverter error codes are generated and displayed by inverters to notify that something wrong can disrupt the normal working of the solar PV system.

The problem can be with the inverter itself, other parts of the solar system, or elements outside the system. The different inverter brands have an array of unique error codes.

True, not all inverter error codes mean a serious problem. Some are simply notifications, and some are automatically rectified. However, if an error persists, you should always seek technical support.

Contact Instyle Solar if you need technical support. Contact us today via 1300 133 556 or email [email protected].

Next Steps…

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