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.
Book free AlphaESS diagnosisHow diagnostics workThis is the second time I have used Solar tech first time a faulty Givenergy inverter, tried all sorts to get it going my last call was to Solar tech and yes they got me back up and running, today system went down again due to a firmeware update and Ron talked me through everything all whilst he was on someone’s roof sorting their system out. I would recommend this chap to every body that has problems with their system no matter what make..
Ron was brilliant. He really tried to help. He spent hours trying to fix our GivEnergy AIO and ultimately it became apparent that it needed parts to fix the BMS management system. As there appears to be no replacement parts available on the market, he gave excellent advice on what options are now available to move forward. He is incredibly helpful and knowledgeable.
Super support. Delighted I found them. System battery was down for quite a while and no one would try to fix it as GivEnergy out of business. A few hours later and I’m up and running again. Brilliant service!!! Highly recommend them.
Brilliant service from Ron - our GivEnergy inverter stopped working on Tuesday what a nightmare seen as the company who installed it are no longer in business. Through social media I found STS (Ron) he had a new inverter and it was fitted and working by Friday - what I thought was going to be a nightmare turned out not to be!!! Great guy great company - def my go to now for anything solar related - Thank you so much
Roland is a true gentleman. He provided a refurbished inverter when my givenergy one failed. The install was a pain and took him hours. I was expecting a big bill but he honoured his price despite the extra effort. While here he diagnosed a battery fault. He helped me get the battery down and recommended an excellent company who could repair the battery. Absolute legend of a person and company
Excellent support. He is extremely knowledgeable and his experience is second to none. I have GivEnergy equipment and he sorted out my solar problems remotely. He was understanding and patient and excellent to deal with. Would highly recommend. Thank you
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_faultInverter error — grid relay110004 — dc_power_alarmAlarm — grid overvoltage derating110021 — Grid Loss AlarmAlarm — no grid detected110022 — Grid Volt AlarmAlarm — grid voltage out of range110023 — Grid Freq AlarmAlarm — grid frequency out of range110024 — 10min Grid Volt AlarmAlarm — sustained voltage deviation110027 — LN Reverse Alarm Wiring fault — do not ignore110059 — grid waveform abnormal alarmAlarm — waveform distortionCodes 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_faultInverter error — insulation resistance100012 — PV_Reverse Polarity reversed — do not touch DC110014 — Pv over voltageAlarm — PV string voltage too high110048 — No Pv Input AlarmAlarm — no solar generation110049 — Input Power Limit AlarmAlarm — PV input power limitedCodes 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_OVPInverter error — battery overvoltage100026 — BAT_UVPInverter error — battery undervoltage100027 — Battery_loseInverter error — battery not detected100030 — BAT1_discharge_OCPInverter error — battery overcurrent110005 — Battery stops running alarmAlarm — battery shutdownInternal 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_OVP1Inverter error — DC bus overvoltage100038 — Output_DC_over_currentInverter error — DC output overcurrent100041 — Output_DC_over_voltageInverter error — DC output overvoltage100046 — DC_Input_DisturbanceInverter error — DC input disruption100054 — Dc_bus_undervoltInverter error — DC bus undervoltage100166 — inverter circuit abnormalInverter error — internal circuit fault100167 — boost circuit abnormalInverter error — boost converter fault110040 — Inv Volt Low AlarmAlarm — inverter voltage lowFaults 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_shortInverter error — output short circuit100043 — Output_overloadInverter error — backup overloaded100052 — Backup_ovpInverter error — backup overvoltage110050 — Output Power Limit AlarmAlarm — output power limitedGround 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 system100058 — AFCI_check_protectInverter error — arc fault protection110006 — over_temperature_alarmAlarm — inverter overheating110029 — GFCI AlarmAlarm — ground fault warning110030 — ISO AlarmAlarm — insulation monitoring110034 — Fan Abnormal AlarmAlarm — cooling fan faultInternal 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_selfcheckInverter error — DSP self-check failed100122 — EEPROM R/W FailureInverter error — memory read/write100123 — DSP communication failureInverter error — DCDC module comms100145 — 12V auxiliary power FaultInverter error — 12V supply failed100165 — data storage errorInverter error — data storage110036 — FLASH ID AlarmAlarm — flash memory ID110037 — ReadFlash AlarmAlarm — flash memory read110039 — Machine Type AlarmAlarm — firmware model mismatchAlphaESS 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.
Independent AlphaESS SMILE inverter & battery diagnostics. SMILE B BMS faults, AlphaCloud monitoring, cell balancing. Free remote diagnostic — no fix, no fee.
See AlphaESS hubDownload AlphaESS datasheets, installation manuals, warranty PDFs, app guides and wiring diagrams. SMILE series inverters and AlphaCloud monitoring.
See documentsFault code guides for the main UK solar inverter and battery brands: what each code means and what to do next. Find your brand and your code below.
See all fault codesBook your free remote solar diagnostic — no fix, no fee. Most faults resolved in a 30-minute session. Same-day response from an independent engineer.
Book diagnosisShare the numeric error code from your LCD or Alpha Cloud alarm log, describe what the system is doing, and when the fault first appeared. We'll identify the root cause and recommend whether it needs a remote fix or an on-site visit.
Due to unprecedented demand we’re currently only carrying out on-site work in Yorkshire, and replies are taking up to 7 days. Remote diagnostics continue for the whole UK as normal.
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