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Fault code reference · AlphaESS SMILE inverter & battery

AlphaESS Error Code Reference

Every AlphaESS SMILE inverter error code and battery alarm — the numeric code, what triggered it, and whether you need an engineer or can resolve it yourself. Look up your code below or browse by system area.

Sourced from official AlphaESS SMILE5 maintenance manual Covers SMILE5, SMILE-S5, and SMILE-BAT series Includes inverter errors (100xxx) and system alarms (110xxx)

AlphaESS Error Code Reference

Every AlphaESS SMILE inverter error code and battery alarm — the numeric code, what triggered it, and whether you need an engineer or can resolve it yourself. Look up your code below or browse by system area.
  • Sourced from official AlphaESS SMILE5 maintenance manual
  • Covers SMILE5, SMILE-S5, and SMILE-BAT series
  • Includes inverter errors (100xxx) and system alarms (110xxx)
AlphaESS error code you can't resolve?

If your AlphaESS inverter is flashing red or showing a numeric error code and you're unsure what to do next, a remote diagnostic identifies the root cause from your Alpha Cloud data — typically within 30 minutes.

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5.0
13 Trustpilot reviews
Trustpilot Google

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot

I have a GivEnergy system consisting of two batteries, two inverters and a controlling EMS (Energy Management System) which has not worked since Nov 2025. After six months I discovered Solar Tech Support, reached out to them and Ron phoned me back – how often do you get that service? Could not be more helpful – worked directly with me over the phone, outside what I would call normal working hours. Lucid explanations and we were able to discuss the issues and history using camera and email history. As this was a very rare setup, Ron was able to access an EMS expert in the field to confirm the solution. One sunny day in, I am now only paying for standing charge and a few pence for spikes in grid consumption while battery catches up with house demand.

Ian · May 2026 Trustpilot

When my GivEnergy system had an issue, I was completely left without support and had honestly lost all hope. Thankfully, I searched online and found Ron, which completely turned things around. After sending him a message, he responded incredibly fast and called me to assure me that he would get the problem fixed. I really admire his dedicated, supportive nature and his determination to find a solution. With this kind of outstanding attitude and customer service, he has absolutely secured a future customer in me.

Sree · May 2026 Trustpilot

Ron want out of is way to help, nothing was to much. He was very thorough in what he did Very knowledgeable I would highly recommend Ron and his company He did a fantastic job for me. if you have any problems, he'll do his best to help you out and resolve your problem. I wouldn't hesitate to recommend them

Dennis Brown · May 2026 Trustpilot

Ron took me through a diagnostic to confirm my GivEnergy Inverter had a fault. A common one as it turns out with the AC Inverter. As GivEnergy is defunct there is no immediate fix, aside from sourcing 2nd hand replacement. It may be that a fix becomes available over the summer which would make a lot of GivEnergy customers happy (Again)

Tony Deacon · May 2026 Trustpilot

Contacted Ron with a problem and he sorted it out quickly with no problems at all. Very knowledgeable on anything solar/ batteries. I would recommend him to anyone

Phill · May 2026 Trustpilot

I've spoken to Ron a couple of times with issues with my Givenergy installation. Such a friendly knowledge guy very highly recommended. Thank you very much for resolving my issues

michael fairhurst · May 2026 Trustpilot

Contacted Solar Tech Support in desperation. After explaining the issues I had with my system a diagnosis was made and a solution proposed. Fantastic service, even contacted a manufacturer to arrange replacement parts for me. Great communications, explained all they were doing and what I had to do, clearly and precisly. Followed up to confirm all was ok. Excellent service.

Mr Machin · May 2026 Trustpilot

After GivEnergy went into liquidation, just my luck, my battery started playing up (internal board crashed). Contacted my installer - not interested! Found Solar tech support on a Google search. Sooo glad I found this company! Ron is extremely helpful and has plenty of experience. He soon confirmed what the fault was, and helped me to get my system up and running again. Now moved my GivEnergy account to Solar tech support, and will definitely use again if I have more issues. Unusual to find such a helpful company in these times, no morons reading scripts, just direct contact with the engineer.

Keith Ballard · Apr 2026 Trustpilot

Contacted Solar Tech Support when trying to understand what my Givenergy inverter problem might be and what might be my options. Received good/honest advise which backed up my thoughts.

Hugh Speirs · Apr 2026 Trustpilot

Ron is a super star. Two months ago my GivEnergy battery failed a firmware upgrade leaving it a brick. My installer couldn't/wouldn't fix it. GivEnergy couldn't/wouldn't fix it. Then they went into administration and all hope was lost. A flurry of emails later and Ron had diagnosed the fault (failed USB flash drive, something I'd suspected) and talked me through resolving it. Two months of nothing resolved in about 3 hours. It's great to work with someone who pays attention to the details, knows that they're doing (not just following a script) and gets stuff sorted without a fuss or up-charging.

Christopher · Apr 2026 Trustpilot

I can add to the list of customers who had already 'given up' on GivEnergy due to their appalling customer service, and that was before they went into administration (their Trustpilot reviews don't lie!). So you can imagine my desperation when, having changed my ISP and my Inverter, predictably, proving to be the only device that didn't connect automatically to my new network, I found zero prospect of any customer support with GivEnergy having called in the administrators just five days earlier! The salvation came from Solar Tech Support. My IT advisor stumbled across their web site and some very helpful tips for beleaguered GivEnergy customers, as well as an offer to provide direct assistance. Nothing ventured, I decided to drop them an E-Mail, with very low expectations based on my experience of GivEnergy customer support. Within an hour Ron had responded with some pin point advice, and after a few exchanges of E-Mails he had nailed the problem, enabling the combined efforts of my IT advisor and solar installer to resolve it and reconnect my Inverter. Thank you Solar Tech Support, and Ron in particular, for coming to the aid of a deserted and despondent GivEnergy customer. Expert, razor sharp advice and first class customer service, even though I wasn't officially a customer.

customer · Apr 2026 Trustpilot

This company are a rare gem, I had a very unusual problem following a failed firmware upgrade on my GivEnergy kit. I then found out GivEnergy were in administration and had dismissed all their support staff! None of the usual fixes to try and restore my inverter comms would work, and I looked everywhere, forums, GivEnergy youtube support videos - even AI couldn't figure it out. My installer was talking about huge sums for system replacements, and being vague / evasive about if they'd even install replacement GivEnergy inverter. Enter Solar Tech Support, reassuring and knowledgeable from the very start, I've learnt loads about my solar system though the friendly chat while my engineer worked as he diagnosed the problem and figured out a fix procedure that I've not found anywhere else - amazing . If you need solar system repairs - especially if you like me have been left high and dry by GivEnergy, I cannot recommend this company enough. Give them a call.

Andy Thomas · Apr 2026 Trustpilot

I sent a message on their website regarding a problem I have on my Givenergy system. Although not supplied by Ronald, I thought it was worth an email. Within the hour on a Saturday, he phoned and we discussed the problem. He logged in remotely and gave excellent advice. I'm too far away for his on-site help but he did diagnose the problem and was happy also to chat through my thoughts about an upcoming solar/battery install I'm planning. Great bloke.... if only he was nearer!

Philip · Apr 2026 Trustpilot
How to find your error code. On the inverter LCD, press ENT → Status to view active faults. In Alpha Cloud (cloud.alphaess.com), open My System and check alarm history. AlphaESS uses numeric codes — 100xxx codes are inverter errors (the system has stopped or limited operation), while 110xxx codes are alarms (warnings that may self-clear). Note the full number before searching this index.
Grid & AC faults

Fault codes triggered by mains supply conditions — voltage deviations, frequency shifts, grid loss, and relay failures. The inverter disconnects from the grid automatically when these protections activate.

100010 — Grid_relay_fault Inverter error — grid relay
The grid relay inside the inverter has failed its self-test. If it occurs occasionally due to a short-term grid abnormality, the inverter recovers automatically. If it recurs frequently and the grid supply is normal, the internal relay may be damaged — contact AlphaESS support or book a diagnostic.
110004 — dc_power_alarm Alarm — grid overvoltage derating
The inverter has entered a derating state due to high grid voltage. Check the grid voltage reading on the LCD or Alpha Cloud — if it is consistently above 253V, the issue is with the mains supply. Contact your DNO. Confirm the Level 1 overvoltage protection threshold with AlphaESS support if needed.
110021 — Grid Loss Alarm Alarm — no grid detected
No mains supply detected. The inverter will resume automatically once the grid returns. If the alarm persists, confirm the AC breaker is on, the AC cable connections at the inverter are tight, and the consumer unit breaker for the solar circuit has not tripped. If the mains supply is present but the alarm continues, the inverter AC input circuit may be faulty.
110022 — Grid Volt Alarm Alarm — grid voltage out of range
Grid voltage is outside the acceptable operating window. Check the grid cable connection is secure. Restart the inverter and monitor whether the alarm returns. If the grid supply is consistently high or low, contact your DNO — the inverter is protecting itself correctly. Grid overvoltage guide →
110023 — Grid Freq Alarm Alarm — grid frequency out of range
Grid frequency has drifted outside the permitted range (typically 47.5–52Hz). The inverter disconnects as required by G98/G99 protection settings and will resume when the grid stabilises. If the alarm recurs frequently, contact your DNO. After obtaining permission, AlphaESS support can adjust the inverter grid protection parameters via the app.
110024 — 10min Grid Volt Alarm Alarm — sustained voltage deviation
The 10-minute sliding average of grid voltage has exceeded the allowable range. This is a more persistent overvoltage or undervoltage condition than a momentary spike. Check the grid voltage and the sliding average voltage protection settings in the inverter configuration.
110027 — LN Reverse Alarm ⚠ Wiring fault — do not ignore
The mains live and neutral wires are reversed at the inverter AC connection. This is a wiring fault that must be corrected by a qualified electrician — do not operate the system until the L/N polarity is corrected at the AC terminal block.
110059 — grid waveform abnormal alarm Alarm — waveform distortion
The grid AC waveform is distorted beyond acceptable limits. This is typically a short-term grid supply anomaly and the inverter will resume automatically. If it occurs frequently, contact your DNO and ask AlphaESS support to review the grid protection parameter settings via the app.
Solar / PV faults

Codes related to the DC input from solar panels — insulation resistance, string polarity, overvoltage from too many panels in series, and input detection failures.

100007 — Insulation_fault Inverter error — insulation resistance
PV string insulation resistance is below the safe threshold. Often caused by moisture on panel cables or junctions — check whether conditions are wet or humid. If the alarm occurs in dry weather, disconnect strings one at a time and power on to isolate the faulty string. Use a megohmmeter to test each string (normal reading is in the megohm range). Persistent insulation faults indicate degraded cable insulation or a damaged panel junction box.
100012 — PV_Reverse ⚠ Polarity reversed — do not touch DC
PV string cables are connected with reversed polarity. The positive and negative DC connectors are swapped. Switch off the PV isolator and do not touch DC cabling — a qualified engineer must reconnect the cables in the correct orientation.
110014 — Pv over voltage Alarm — PV string voltage too high
The open-circuit voltage of the PV string exceeds the maximum MPPT input voltage. Calculate the maximum open-circuit voltage at the lowest expected local temperature and compare it with the MPPT rating. If the string has too many panels in series, one or more panels will need to be removed or the string reconfigured.
110048 — No Pv Input Alarm Alarm — no solar generation
No PV input detected. If this occurs in weak light (early morning, dusk, heavy cloud) it is normal — the string voltage is simply too low to activate the MPPT tracker. If it occurs in good light, check for a short circuit or open circuit in the panel string connections. Verify the PV isolator is switched on and the string insulation resistance is adequate.
110049 — Input Power Limit Alarm Alarm — PV input power limited
PV input power has reached the inverter's maximum input capacity and is being clipped. This is normal behaviour in peak generation conditions — no action required. The inverter limits input power to protect its components.
Battery & BMS faults

Codes from the battery management system and the inverter's battery interface — covering overvoltage protection, undervoltage shutdown, communication loss, and overcurrent events during charging or discharging.

100025 — BAT_OVP Inverter error — battery overvoltage
Battery voltage has exceeded the safe upper limit. During initial installation, confirm the battery voltage is within the allowable range for the inverter model. If this occurs during normal operation, it may indicate a charging fault or BMS communication anomaly — check that battery wiring is secure and BMS communication is intact. A loose connection can cause voltage spikes that trigger this protection.
100026 — BAT_UVP Inverter error — battery undervoltage
Battery voltage has dropped below the minimum safe threshold. Confirm the battery voltage is within the allowable range and that both the inverter breaker and the battery switch are closed and on. If the alarm occurs during operation, check whether the breaker has tripped and whether the battery BMS is reporting any alarms of its own.
100027 — Battery_lose Inverter error — battery not detected
The inverter cannot detect the battery. Check that the battery DC wiring is connected correctly and securely, the DC switch is closed, and the BMS communication cable (RS485 or CAN) is in place. If the battery is powered on and the connections are correct, the BMS may have entered a lockout state — power cycle both the inverter and battery.
100030 — BAT1_discharge_OCP Inverter error — battery overcurrent
Battery discharge current has exceeded the protection limit. If the battery is over-discharged, reduce the backup load connected to the inverter and restart. Wait five minutes for the fault to automatically clear. If it persists, the battery or inverter may have a hardware issue requiring diagnosis.
110005 — Battery stops running alarm Alarm — battery shutdown
The battery has stopped operating due to a shutdown command. Contact AlphaESS support to restart the inverter and check whether it recovers. If the alarm clears after a restart but returns, unplug the communication module and confirm whether the alarm clears — if so, the communication module may need replacing.
Inverter & DC bus faults

Internal inverter errors related to the DC bus, output stage, and power electronics. Many of these recover automatically from transient grid disturbances — persistent occurrences indicate a hardware fault requiring professional diagnosis.

100005 — BUS_OVP1 Inverter error — DC bus overvoltage
Internal DC bus voltage has exceeded the safe limit. An occasional occurrence caused by a grid transient will recover automatically. If it persists, the inverter's internal voltage regulation is faulty — contact AlphaESS support for further diagnosis.
100038 — Output_DC_over_current Inverter error — DC output overcurrent
DC output current has exceeded the protection threshold. A transient grid anomaly can trigger this — the inverter should recover automatically. If it continues to appear and the inverter cannot generate power normally, the output stage may be damaged. Contact AlphaESS support.
100041 — Output_DC_over_voltage Inverter error — DC output overvoltage
DC output voltage has exceeded the protection threshold. An occasional occurrence recovers automatically. If it persists and the inverter cannot generate power, the internal circuitry may be faulty — contact AlphaESS support for further investigation.
100046 — DC_Input_Disturbance Inverter error — DC input disruption
Disturbance detected on the DC input from the PV array. Occasional occurrences from grid transients recover automatically. If it persists, check DC cable connections and PV string integrity. Contact AlphaESS support if the fault continues after verification.
100054 — Dc_bus_undervolt Inverter error — DC bus undervoltage
Internal DC bus voltage has dropped below the operating minimum. An occasional occurrence will self-recover. Persistent faults indicate the inverter's internal power supply or voltage regulation has failed — contact AlphaESS support.
100166 — inverter circuit abnormal Inverter error — internal circuit fault
The inverter circuit has failed to start normally or an internal flag is set. Try restarting the inverter. If it does not recover, contact AlphaESS support to remotely upgrade the firmware. As a last resort, fully power off the inverter (all breakers off, wait 5 minutes) and restart. If the fault still persists, the inverter requires professional inspection.
100167 — boost circuit abnormal Inverter error — boost converter fault
The inverter's boost converter circuit is not functioning correctly. Contact AlphaESS support to try a remote firmware upgrade. If the inverter does not recover, fully power off, wait 5 minutes, and restart. Persistent faults indicate a hardware issue requiring professional repair.
110040 — Inv Volt Low Alarm Alarm — inverter voltage low
Low component voltage detected inside the inverter. In weak light conditions (dawn, dusk, heavy rain) this is normal and will clear when irradiance improves. If it occurs in good sunlight, check for a short circuit or open circuit in the PV string connections.
Backup / UPS faults

Faults related to the backup (UPS) output — the secondary AC output that powers essential loads during a grid outage. Overload and overvoltage protection events on this circuit.

100042 — Output_short Inverter error — output short circuit
A short circuit has been detected on the backup output. Disconnect the backup load and restart the inverter. If the fault clears, the issue is with the connected appliance or the backup wiring — inspect the backup circuit for damage. If the fault cannot be cleared, the inverter output stage may be damaged.
100043 — Output_overload Inverter error — backup overloaded
The load connected to the backup output exceeds the inverter's UPS power rating. Check which appliances are connected to the backup circuit and remove high-draw items such as kettles, heaters, or electric ovens. Reduce the load, then restart the inverter or wait five minutes for the fault to auto-clear. If the fault persists after reducing the load, disconnect the backup load entirely and restart.
100052 — Backup_ovp Inverter error — backup overvoltage
Overvoltage detected on the backup output. An occasional occurrence will recover automatically. If persistent, the inverter's backup output voltage regulation may be faulty — contact AlphaESS support for further diagnosis.
110050 — Output Power Limit Alarm Alarm — output power limited
The inverter's output power has reached its rated limit and is being capped. Restart the system and check whether the fault clears. If the fault cannot be cleared, the inverter output stage may need inspection — contact AlphaESS support.
Safety & protection

Ground fault detection, arc fault protection, insulation monitoring, overtemperature shutdown, and fan failure alarms. These codes indicate safety-critical conditions — some require the system to be isolated before any inspection.

100008 — GFCI_fault ⚠ Ground fault — isolate system
Ground fault current detected. If accompanied by an insulation resistance alarm (100007), follow the insulation fault troubleshooting steps first. If it occurs frequently with other alarms and the inverter cannot connect to the grid, the GFCI circuit inside the inverter may be faulty — do not restart without professional assessment.
100058 — AFCI_check_protect Inverter error — arc fault protection
The arc fault detection circuit has triggered. Restart the system and check whether the fault persists. If it does, a DC arc may be present in the PV string or battery cabling — do not touch DC connectors. Contact a qualified engineer to inspect all DC connections for signs of arcing, melting, or discolouration.
110006 — over_temperature_alarm Alarm — inverter overheating
The inverter's internal temperature has exceeded its safe operating limit. Check whether the installation is in direct sunlight, whether ventilation is adequate, and whether the ambient temperature exceeds 45°C. If the environment is within limits and the alarm persists, the internal cooling fan or temperature sensor may be faulty — contact AlphaESS support.
110029 — GFCI Alarm Alarm — ground fault warning
Ground fault current interrupter has triggered at the alarm (warning) level. If accompanied by insulation fault alarms, follow the insulation fault guidance. If it occurs frequently and the inverter cannot connect to the grid, the inverter's GFCI circuit may need replacement — contact AlphaESS support.
110030 — ISO Alarm Alarm — insulation monitoring
Insulation monitoring alarm — the system has detected a potential insulation degradation event. Restart the system and check whether the fault persists. If it does, the PV string insulation may need testing by a qualified engineer with a megohmmeter.
110034 — Fan Abnormal Alarm Alarm — cooling fan fault
The inverter's cooling fan is not operating correctly. Check via the Alpha Cloud app whether the internal temperature has reached 60°C — if an external fan triggered the alarm, power off, restart, and observe whether the external fan is running. Inspect the fan for blocked vents, damage, or foreign objects. If an internal fan is faulty, the inverter will require a service visit to replace it.
System & firmware

Internal system errors related to firmware, memory, DSP communication, and the 12V auxiliary supply. These typically require AlphaESS support involvement for remote firmware updates or hardware diagnosis.

100060 — Dsp_selfcheck Inverter error — DSP self-check failed
The inverter's internal DSP processors are not compatible. This is a hardware-level fault — the inverter requires professional repair. Contact AlphaESS support to arrange a service or replacement unit.
100122 — EEPROM R/W Failure Inverter error — memory read/write
The inverter's EEPROM memory has failed a read/write operation. If a remote firmware upgrade was recently performed and the inverter is operating normally, this is a normal transient result of the upgrade process. If it persists or the inverter is not operating, contact AlphaESS support.
100123 — DSP communication failure Inverter error — DCDC module comms
Communication between the inverter and its internal DCDC module has been lost. Contact AlphaESS support to attempt a remote DCDC module firmware upgrade. If that does not restore communication, fully power off the inverter for 10 minutes and restart. Persistent faults require professional inspection.
100145 — 12V auxiliary power Fault Inverter error — 12V supply failed
The inverter's internal 12V auxiliary power supply has failed. An occasional occurrence may recover automatically. If it continues to appear, the 12V supply board inside the inverter is faulty and will require a hardware repair or replacement — contact AlphaESS support.
100165 — data storage error Inverter error — data storage
An error has occurred in the inverter's internal data storage. An occasional occurrence recovers automatically. If persistent, the inverter's storage hardware is faulty — contact AlphaESS support for diagnosis and potential replacement.
110036 — FLASH ID Alarm Alarm — flash memory ID
Flash memory identification error. Restart the system and check whether the fault persists. If it does, contact AlphaESS support — the flash memory chip may require replacement or the firmware may need to be reflashed.
110037 — ReadFlash Alarm Alarm — flash memory read
The inverter cannot read from its flash memory correctly. Restart the system. If persistent, contact AlphaESS support for a firmware reflash or hardware inspection.
110039 — Machine Type Alarm Alarm — firmware model mismatch
The firmware loaded on the inverter does not match the physical hardware model. This typically occurs after an incorrect firmware update has been applied. Contact AlphaESS support to load the correct firmware version for your inverter model.
Code not listed here?

AlphaESS may release new error codes with firmware updates, and different SMILE hardware generations can have additional codes not shown here. Share the exact numeric code from your LCD or Alpha Cloud alarm history and we'll identify it. AlphaESS also maintain support via cloud.alphaess.com.

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FAQ

AlphaESS fault code questions

Fault codes appear on the inverter LCD display and in Alpha Cloud. On the SMILE5, press ENT to enter the menu, then navigate to Status to view active alarms. In Alpha Cloud (cloud.alphaess.com), open My System and check the alarm history for timestamped error codes. Each code has a numeric identifier like 100007 or 110021 that you can look up in this index.
Many 110xxx alarm codes clear automatically once the triggering condition resolves — for example, a Grid Volt Alarm clears when mains voltage returns to normal. For persistent 100xxx error codes, a full power cycle (switch off the AC breaker, battery breaker, and PV isolator, wait five minutes for capacitors to discharge, then restore power in reverse order) can clear transient faults. If the same code returns after a power cycle, the underlying issue requires diagnosis rather than repeated restarting.
A red fault LED on the SMILE inverter indicates an active hardware or protection fault. The LCD screen shows the specific numeric error code. Common causes include grid relay faults, insulation resistance failures, battery communication loss, and DC bus voltage problems. Note the code from the display and look it up in this index before taking any action — some codes indicate conditions where the system should not be touched without a qualified engineer present.
STS offers remote diagnostic assessments from free. Our engineers can access your Alpha Cloud monitoring data remotely to analyse fault history, system performance, and configuration without visiting site. The diagnostic identifies the root cause and recommends whether a settings change, firmware update, or on-site repair is needed — saving you the cost of an unnecessary callout.
Error 100007 (Insulation_fault) is one of the most common AlphaESS alarm codes and is typically caused by moisture on PV panel cables or junction boxes — it often appears during or after rain and clears when conditions dry out. If it occurs frequently in dry weather, the insulation resistance of one or more PV strings has degraded. An engineer can isolate individual strings and test with a megohmmeter to identify the affected circuit. Persistent insulation faults should not be ignored as they indicate a potential safety issue.
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AlphaESS error code you need diagnosed?

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