Troubleshooting · 366 of 366 articles
Solar troubleshooting knowledge for every installer and system owner
Practical troubleshooting guides from Solar Works Pakistan for installers and system owners across Punjab, throughout Pakistan, and around the world. Search the articles below by symptom or system issue to understand possible causes, work through relevant checks, and make more informed decisions on site.
All areas · 366 articles Inverter trips on high or low grid voltageThe inverter keeps disconnecting from the grid and reconnecting a few minutes later. In most cases it is protecting itself and your wiring from unstable grid voltage, exactly as it should. INVERTER FAULTS Overvoltage trips on sunny afternoonsThe system trips on clear, bright afternoons, exactly when it should be producing most. The usual cause is local grid voltage rising as many rooftop systems export at once. INVERTER FAULTS Isolation or ground fault after rainAfter rain, heavy dew or panel washing, the inverter shows an isolation, insulation or ground fault and will not start until the array dries. Moisture is finding a path to earth somewhere on the DC side. INVERTER FAULTS Inverter overheating and derating in summerOn hot afternoons output flattens or drops even though the sun is strong. The inverter is reducing power to protect itself from heat, which is called derating. INVERTER FAULTS Inverter display is blank with no lightsThe screen is dark and no lights are on. Sometimes this is normal, early in the morning or late in the evening. At midday it usually means the inverter is not receiving power from either side. INVERTER FAULTS How to read an inverter fault codeEach brand uses its own fault codes, but they fall into a handful of families. Knowing which family a code belongs to tells you whether to wait, check something simple or call us. INVERTER FAULTS Arc fault warnings and burnt MC4 connectorsAn arc fault means the inverter has detected electrical sparking somewhere on the solar side. It shuts down to stop the sparking. Treat it seriously: the usual cause is a loose or badly made connector. INVERTER FAULTS Faults that only appear after sunsetEverything works during the day, but alarms, cut-outs or beeping start in the evening. On a hybrid system this almost always involves the battery or the evening load. INVERTER FAULTS Firmware glitches and false error codesOccasionally an inverter shows a code that makes no sense, freezes its screen or reports impossible values. Software can be the cause, and manufacturers fix known bugs through firmware updates. INVERTER FAULTS Inverter fan noise, humming or vibrationSome hum and fan noise is normal, especially at full power on a hot afternoon. New or louder noises such as rattling, clicking, grinding or a buzz that keeps rising are worth reporting. INVERTER FAULTS Battery is connected but the inverter cannot see itThe battery is installed and switched on, but the inverter shows no battery, a communication alarm or a state of charge stuck at zero. The cells are usually fine. The problem is almost always the link between the battery and the inverter. BATTERIES Why “supports CAN or RS485” does not mean compatibleMany batteries and inverters list the same communication ports, yet still refuse to work together. Having the same socket is not the same as speaking the same language. BATTERIES Is my inverter compatible with a Dyness battery?Dyness publishes a list of the inverters it has confirmed can work with its low voltage batteries, such as the DL5.0C and PowerBrick. The latest version we have is dated 14 January 2026. If your exact inverter model is not on it, treat the pair as unconfirmed until Dyness or the inverter maker confirms it. BATTERIES Battery percentage jumps or driftsThe battery shows full and then suddenly drops, sits at one number for hours, or reads differently on the battery and the inverter. The percentage is an estimate, and it depends on good communication and regular full charges. BATTERIES “BMS offline” alarms that come and goThe app briefly reports the battery or BMS as offline, then it reconnects by itself. The battery often keeps working during the dropout, but the alarm should not be ignored. BATTERIES Dust, smog and monsoon lossesPakistan’s dust, winter smog and monsoon storms all cut generation. Some of the loss is weather you cannot change, and some is dirt you can wash off. PANELS AND GENERATION Output lower than usual at middayA healthy system peaks between late morning and mid-afternoon. If that peak shrinks, flattens or develops dips without a change in weather, something is reducing output. PANELS AND GENERATION Hot spots on solar panelsA hot spot is a patch of a panel that runs much hotter than the rest. It wastes power and, left alone, can damage the glass and backsheet. It needs a technician, not a DIY fix. PANELS AND GENERATION PID: the slow, hidden power lossPotential induced degradation (PID) is a gradual loss of panel output caused by voltage stress, heat and humidity. It creeps in over years and is easy to mistake for normal ageing. PANELS AND GENERATION Normal degradation or a real fault?All panels lose a little output every year. The question is whether your loss is inside the manufacturer’s warranted rate or faster than it. PANELS AND GENERATION Solar panel junction box failuresThe junction box on the back of each panel is where the cables leave the panel and where its bypass diodes sit. When it fails, the panel loses output and can overheat. PANELS AND GENERATION Monitoring offline after a router changeThe app shows your plant as offline, but the system is still generating. Almost always the WiFi dongle has lost its connection, usually because the router, network name or password changed. MONITORING AND BILLING Exported units do not match the billYour app says you exported a certain number of units, but the DISCO bill credits fewer, or none. Small differences are normal. Large gaps usually come from meter readings, billing dates or a meter setup problem. MONITORING AND BILLING Why output drops in Lahore’s smog seasonBetween November and January, smog and haze over Lahore reduce the sunlight reaching your panels. A lower winter total is expected. The question is whether your drop is weather or a fault. PANELS AND GENERATION Waiting for a LESCO green meter after paying the demand noticeIn September 2026 LESCO was reported to have paused issuing bidirectional (green) meters because of a shortage. If you have paid your demand notice and are still waiting, here is what that means and what to keep ready. MONITORING AND BILLING Billed under net billing when you signed for net meteringSome LESCO consumers who applied and signed under the net metering policy received bills calculated under net billing instead. LESCO has started reviewing and correcting qualifying cases. MONITORING AND BILLING White stains on panels after washingWashing with hard tap water can leave white mineral spots on the glass. Over time they build up into a film that blocks light and resists normal cleaning. PANELS AND GENERATION Cracked panels after a hailstormHail in Punjab this year cracked panels on homes and tubewells. A cracked panel may still produce power, but it is no longer weatherproof and needs replacing. PANELS AND GENERATION Checking your panel structure before storm seasonStorms in Lahore have torn loose rooftop panels, and authorities have urged owners to secure them. A few checks before the pre-monsoon and monsoon storms can prevent damage to your roof, your neighbours and people below. PANELS AND GENERATION Voltage spikes when power returns after load-sheddingThe moment grid power comes back after load-shedding is when the worst voltage spikes happen. Repeated spikes can trip or damage the inverter and other appliances. INVERTER FAULTS Textile lint and industrial dust on Faisalabad rooftops PANELS AND GENERATION Inverter trips when looms or large motors start INVERTER FAULTS Why commercial files above 25 kW take longer at FESCO MONITORING AND BILLING Sawtooth shed roofs: shading and cleaning access PANELS AND GENERATION Factory solar: using it yourself versus exporting MONITORING AND BILLING Housekeeping around solar on textile rooftops PANELS AND GENERATION Generator and changeover safety with solar INVERTER FAULTS Why does an on-grid inverter stop during load-shedding? BACKUP AND LOAD-SHEDDING Hybrid inverter is running, but backup circuits have no power BACKUP AND LOAD-SHEDDING Load division: choosing which appliances run on solar backup BACKUP AND LOAD-SHEDDING Why do computers and routers restart during solar backup changeover? BACKUP AND LOAD-SHEDDING Why does solar backup stop when clouds pass? BACKUP AND LOAD-SHEDDING Why won’t a hybrid inverter restart after the battery runs flat? BACKUP AND LOAD-SHEDDING Why does an existing UPS behave strangely on solar backup? BACKUP AND LOAD-SHEDDING Why do appliances work on grid electricity but struggle on solar backup? BACKUP AND LOAD-SHEDDING Why do lights flicker only on battery backup? BACKUP AND LOAD-SHEDDING Can a hybrid inverter provide daytime backup without batteries? BACKUP AND LOAD-SHEDDING Why are the solar panels generating but the battery is not charging? BATTERY CHARGING Why is the battery charging from the grid on a sunny day? BATTERY CHARGING Why is the battery charging more slowly than expected? BATTERY CHARGING Why does battery charging stop before reaching full? BATTERY CHARGING Why does the system export electricity before charging the battery? BATTERY CHARGING Why does battery charging pause when the battery room gets hot? BATTERY CHARGING Why is battery charging limited on cold mornings? BATTERY CHARGING Why does scheduled battery charging fail to start? BATTERY CHARGING Why does one parallel battery charge more slowly than the others? BATTERY CHARGING Why does the battery keep switching between charging and discharging during the day? BATTERY CHARGING Why is battery backup shorter than the estimated duration? BATTERIES Why does the battery drain when the house or business appears switched off? BATTERIES Why does the system use grid electricity when the battery still has charge? BATTERIES Why can’t I run more appliances after adding another battery? BATTERIES Can I add a new lithium battery to an older battery bank? BATTERIES Why is some battery capacity missing after an expansion? BATTERIES What does a battery cell-imbalance alarm mean? BATTERIES Why does the battery breaker trip when the inverter starts? BATTERIES What should I do if a battery swells, leaks or gives off an unusual smell? BATTERIES How should a solar battery be stored and restarted after months without use? BATTERIES Why does a three-phase inverter show overload when total load looks low? THREE-PHASE SYSTEMS Why does solar stop when one grid phase goes missing? THREE-PHASE SYSTEMS Why does one phase import electricity while another exports it? THREE-PHASE SYSTEMS Can a three-phase inverter supply its full rated power on one phase? THREE-PHASE SYSTEMS Why do two solar inverters at the same property produce different amounts? PANELS AND GENERATION Why do parallel hybrid inverters appear to share the load unevenly? INVERTER FAULTS Why does a PV overvoltage warning appear on cold mornings? INVERTER FAULTS What is the difference between a grid-frequency fault and a grid-voltage fault? INVERTER FAULTS What happens when the inverter loses communication with its meter or export controller? INVERTER FAULTS Why does the inverter report a relay self-check fault? INVERTER FAULTS Why does the AC breaker trip when the inverter shows no fault? WIRING AND ELECTRICAL SAFETY Why does the earth-leakage device trip only on solar backup? WIRING AND ELECTRICAL SAFETY What should I do about buzzing, a burning smell or scorch marks at the electrical board? WIRING AND ELECTRICAL SAFETY Why do taps, appliances or metalwork give an electric tingle? WIRING AND ELECTRICAL SAFETY What should I do if solar cables are exposed or the conduit is cracked? WIRING AND ELECTRICAL SAFETY What should I do if rodents have damaged solar wiring? WIRING AND ELECTRICAL SAFETY What should happen if roof renovation disturbs the solar system? ROOF AND STRUCTURE Why is fitting a bigger breaker not a fix for repeated tripping? WIRING AND ELECTRICAL SAFETY Can a long AC cable cause voltage problems or energy losses? WIRING AND ELECTRICAL SAFETY What if my solar installation has no earthing test records? WIRING AND ELECTRICAL SAFETY Why do solar panels not always produce their nameplate wattage? PANELS AND GENERATION Is a flat solar production curve normal clipping or a fault? PANELS AND GENERATION Why does one PV string or inverter input show zero? PANELS AND GENERATION Why did solar production fall after adding more panels? PANELS AND GENERATION Why am I seeing little extra generation from bifacial panels? PANELS AND GENERATION What are the dark lines or snail trails appearing on my panels? PANELS AND GENERATION Why is a solar panel bubbling, peeling or turning yellow? PANELS AND GENERATION What should I do about birds nesting beneath solar panels? PANELS AND GENERATION Could handling or roof work have caused microcracks in my panels? PANELS AND GENERATION How can a discontinued solar panel be replaced correctly? PANELS AND GENERATION What should I do if my roof leaks after solar installation? ROOF AND STRUCTURE Should solar structure base plates be fixed to tiles or the structural slab? ROOF AND STRUCTURE What do cracks or crumbling concrete around solar supports mean? ROOF AND STRUCTURE Can a solar structure block roof drainage or cause standing water? ROOF AND STRUCTURE Why must roof access and maintenance space be planned around solar panels? ROOF AND STRUCTURE Why does rust return after a solar structure has been repainted? ROOF AND STRUCTURE Corrosion checks for humid sites in Faisalabad and Lahore ROOF AND STRUCTURE Can solar panels be installed on an old or apparently weak roof? ROOF AND STRUCTURE Is it safe for solar panels to extend beyond a roof or support frame? ROOF AND STRUCTURE What should be agreed before removing and reinstalling solar panels for roof repairs? ROOF AND STRUCTURE Why does the solar app show negative household consumption? MONITORING AND BILLING Why do solar, battery, grid and load figures not add up in the app? MONITORING AND BILLING Can missing solar history be recovered after an internet outage? MONITORING AND BILLING Why does solar production appear at the wrong time or on the wrong date? MONITORING AND BILLING Why does my inverter or logger say it is already registered? MONITORING AND BILLING How can I recover access to my solar monitoring account? MONITORING AND BILLING Can I change the installer linked to my solar monitoring account? MONITORING AND BILLING Why does the app lag behind the inverter screen? MONITORING AND BILLING Why did I receive no notification when my solar system developed a fault? MONITORING AND BILLING Why are old or duplicate devices still visible in the solar app? MONITORING AND BILLING Why is my electricity bill still high after installing solar? MONITORING AND BILLING Why does the house import electricity while the sun is shining? MONITORING AND BILLING What should I do if the electricity meter’s display goes blank? MONITORING AND BILLING Which readings should I keep when the utility replaces my electricity meter? MONITORING AND BILLING Why is my electricity bill based on an estimate when solar monitoring is available? MONITORING AND BILLING How do arrears and adjustments affect the bill after solar installation? MONITORING AND BILLING Why has my factory’s maximum-demand charge not fallen with solar generation? MONITORING AND BILLING Why can a factory’s power factor become worse after solar installation? MONITORING AND BILLING How should a landlord and tenant check a shared solar electricity statement? MONITORING AND BILLING Why does a zero-export system occasionally show electricity going to the grid? MONITORING AND BILLING What should I record when a solar fault keeps coming back? WARRANTY, RECORDS AND SERVICE What should be checked when buying or taking over a property with solar? WARRANTY, RECORDS AND SERVICE What evidence helps an inverter warranty claim? WARRANTY, RECORDS AND SERVICE What is the difference between a solar panel’s product and performance warranties? WARRANTY, RECORDS AND SERVICE What should a solar repair or replacement quotation include? WARRANTY, RECORDS AND SERVICE What if my solar installation’s handover documents are missing? WARRANTY, RECORDS AND SERVICE What does a cooling-system alarm on an industrial battery cabinet mean? BATTERIES What should staff do when an energy-storage cabinet gives a fire or gas alarm? BATTERIES Why is a solar water pump running but delivering less water? PUMPS, GENERATORS AND OTHER LOADS Why does an EV charger stop or slow down on solar backup? PUMPS, GENERATORS AND OTHER LOADS Should I give a technician remote access to my solar system? MONITORING AND BILLING What should be checked after an inverter firmware update? INVERTER FAULTS What needs to be checked after replacing a solar inverter? WARRANTY, RECORDS AND SERVICE How can I check inverter and battery identification before accepting delivery? WARRANTY, RECORDS AND SERVICE Does a battery’s advertised cycle life tell me how long its warranty lasts? WARRANTY, RECORDS AND SERVICE Why is the generator still running after solar starts producing power? PUMPS, GENERATORS AND OTHER LOADS Can compressed-air leaks reduce the benefit of factory solar? PUMPS, GENERATORS AND OTHER LOADS Can solar equipment be restarted after floodwater or roof water gets inside? WIRING AND ELECTRICAL SAFETY What should be checked after a fire near a solar installation? WIRING AND ELECTRICAL SAFETY Does an IP rating mean an inverter or battery can tolerate any outdoor condition? WIRING AND ELECTRICAL SAFETY How should I check a contractor’s solar-panel cleaning method? PANELS AND GENERATION Why did production change after a water tank, wall or nearby building was added? PANELS AND GENERATION Why does switching off the main breaker not make the whole solar system safe? WIRING AND ELECTRICAL SAFETY Who pays for a solar service visit when a component is under warranty? WARRANTY, RECORDS AND SERVICE What should a completed solar repair report tell me? WARRANTY, RECORDS AND SERVICE Solis Inverter Error Codes and Alarms Explained INVERTER FAULTS Huawei Inverter Alarm Codes Explained (SUN2000 and LUNA2000) INVERTER FAULTS GoodWe Inverter Error Codes Explained INVERTER FAULTS Sungrow Inverter Error Codes Explained INVERTER FAULTS Inverex Inverter Error Codes and Fault Meanings INVERTER FAULTS Knox Inverter Fault Codes: What the Alarms Mean and What to Check INVERTER FAULTS SAJ Inverter Error Codes: R5 and R6 Faults Explained INVERTER FAULTS SolarMax Hybrid Inverter Error Codes: SM-3.6K and SM-5K-H1P INVERTER FAULTS Sineng Inverter Alarm Codes: SN50PT and SN60PT INVERTER FAULTS Soluna Battery Alarms: What Each Level Means BATTERIES ABi-Solar Inverter Fault Codes: GT 3K and 5K INVERTER FAULTS Primax Inverter Error Codes: What the Alarms Mean and What to Do INVERTER FAULTS Luminey Battery Problems: Alarms, BMS Faults and What to Check BATTERIES Inverter Battery Low Voltage Alarm: What It Means and What to Check BATTERIES Lithium Battery Not Turning On: BMS Sleep and Deep Discharge BATTERIES Inverter Not Turning On: What to Check INVERTER FAULTS Inverter Bypass Mode: Why Your Inverter Is Stuck in Line Mode BACKUP AND LOAD-SHEDDING Inverter Not Taking Solar Power (PV Input Zero) PANELS AND GENERATION Inverter Keeps Restarting or Switching Off and On INVERTER FAULTS Generator Not Working With Inverter: Hybrid Inverter Causes and Checks PUMPS, GENERATORS AND OTHER LOADS Inverter Damaged by Lightning: What to Do Next WIRING AND ELECTRICAL SAFETY AC Not Running on Solar: Common Causes and Fixes PUMPS, GENERATORS AND OTHER LOADS Stabilizer With Solar Inverter: Do You Need One, and Where Does It Go? WIRING AND ELECTRICAL SAFETY One String Low Output: Why PV1 and PV2 Show Different Readings PANELS AND GENERATION Lithium Battery Beeping: What the Alarm Sound Means BATTERIES Parallel Inverter Error: Why Parallel Inverters Stop Syncing INVERTER FAULTS Inverter Starting Late in Morning? Causes and Checks for On-Grid Systems PANELS AND GENERATION Solar System After Flood: Safe Restart Steps for Homes and Factories WIRING AND ELECTRICAL SAFETY How to Restart Solar Inverter Safely: The Correct Shutdown and Start-Up Order INVERTER FAULTS Sungrow inverter shows Grid Overvoltage (code 2, 3, 14 or 15) INVERTER FAULTS Sungrow inverter shows Grid Undervoltage (code 4 or 5) INVERTER FAULTS Sungrow inverter shows Grid Power Outage (code 10) BACKUP AND LOAD-SHEDDING Sungrow inverter shows Grid Overfrequency or Underfrequency (code 8 or 9) INVERTER FAULTS Sungrow inverter shows Grid Abnormal (code 13) INVERTER FAULTS Sungrow three-phase inverter shows Grid Voltage Imbalance (code 17) THREE-PHASE SYSTEMS Sungrow inverter shows Low System Insulation Resistance (code 39) INVERTER FAULTS Sungrow inverter shows Excess Leakage Current (code 12) INVERTER FAULTS Sungrow inverter shows Grounding Cable Fault (code 106) WIRING AND ELECTRICAL SAFETY Sungrow inverter shows Excessively High Ambient Temperature (code 37) INVERTER FAULTS Sungrow inverter shows PV Reverse Connection (codes 28, 29, 264–283, 448–479, 532–579) PANELS AND GENERATION Sungrow inverter shows PV Abnormal Alarm (codes 548–563, 580–595) PANELS AND GENERATION Sungrow inverter shows String Current Reflux (codes 1548–1579) PANELS AND GENERATION Sungrow inverter shows PV Grounding Fault (1600–1615, 1632–1655) or System Hardware Fault (1616) WIRING AND ELECTRICAL SAFETY Sungrow inverter shows Electric Arc Fault (code 88) WIRING AND ELECTRICAL SAFETY Sungrow shows Reverse Connection Alarm of the Meter/CT (code 84) MONITORING AND BILLING Sungrow shows Meter Communication Abnormal Alarm (code 514) MONITORING AND BILLING Sungrow hybrid shows Off-Grid Load OverPower (code 51) BACKUP AND LOAD-SHEDDING Sungrow hybrid shows Grid Confrontation (code 323) BACKUP AND LOAD-SHEDDING Sungrow hybrid shows BMS Communication Fault (714) or Abnormal Battery Connection (716) BATTERIES Sungrow hybrid shows Battery Alarm or Battery Fault: what is the difference? BATTERIES Sungrow inverter shows System Fault or System Alarm INVERTER FAULTS Sungrow inverter light is red or flashing blue: what does it mean? INVERTER FAULTS Sungrow microinverter shows a red light or one panel stops producing INVERTER FAULTS Sungrow hybrid backup stopped during load-shedding and the battery will not discharge BACKUP AND LOAD-SHEDDING SOFAR inverter shows GridOVP (ID001, ID009, ID010) or VoltDerating (ID116) INVERTER FAULTS SOFAR inverter shows GridUVP (ID002) or VoltLoading (ID117) INVERTER FAULTS SOFAR inverter shows GridOFP or GridUFP (ID003, ID004) INVERTER FAULTS SOFAR inverter shows IslandFault (ID008) during load-shedding BACKUP AND LOAD-SHEDDING SOFAR inverter shows GFCI Fault (ID005) INVERTER FAULTS SOFAR inverter shows IsoFault (ID042, low insulation) INVERTER FAULTS SOFAR inverter shows PEConnectFault (ID043) or N-PE fault (ID032) WIRING AND ELECTRICAL SAFETY SOFAR inverter shows PV Reverse Connection (ID046) PANELS AND GENERATION SOFAR inverter shows PVOVP (ID069, PV over-voltage) PANELS AND GENERATION SOFAR inverter shows PV Config Error (ID044) or IpvUnbalance (ID087) PANELS AND GENERATION SOFAR inverter shows a temperature fault (ID050–ID061) or OverTempDerating (ID113) INVERTER FAULTS SOFAR inverter shows FanFault (ID169–ID174) INVERTER FAULTS SOFAR shows CT error (ID045) or Meter Comm Lose (ID105) MONITORING AND BILLING SOFAR hybrid shows Overload (ID110–ID112) or EPS short circuit (ID094) BACKUP AND LOAD-SHEDDING SOFAR hybrid shows BMS Communication Fault (ID157) or BMS version error (ID183–ID185) BATTERIES SOFAR hybrid stops charging or discharging: battery temperature protection (ID186–ID190, ID179, ID180) BATTERY CHARGING SOFAR hybrid shows Low battery (ID124, ID158) or Battery prohibition discharge (ID125) BATTERIES SOFAR hybrid shows BMS OVP, UVP, OCP or Short alarm (ID177–ID182) BATTERIES SOFAR inverter shows an internal fault: what to do INVERTER FAULTS SOFAR inverter shows RelayFail (ID041) or grid relay failure (ID140, ID144) INVERTER FAULTS SOFAR inverter shows AFCI Arc Fault (ID089) WIRING AND ELECTRICAL SAFETY SOFAR inverter shows DC or AC SPD failure (ID142, ID143) after a storm WIRING AND ELECTRICAL SAFETY SOFAR inverter shows WifiFault (ID146) or the app is offline MONITORING AND BILLING SOFAR shows ForceShutdown, RemoteShutdown or Feed-in Limitation derating (ID161–ID167) INVERTER FAULTS SOFAR hybrid shows GenStartupFail (ID108) or Generator Overload (ID109) PUMPS, GENERATORS AND OTHER LOADS Growatt inverter shows AC V Outrange (Error 300) INVERTER FAULTS Growatt inverter shows No AC Connection (Error 302) BACKUP AND LOAD-SHEDDING Growatt inverter shows AC F Outrange (Error 304) INVERTER FAULTS Growatt inverter shows PV Isolation Low (Error 203) INVERTER FAULTS Growatt inverter shows Residual I High (Error 201) INVERTER FAULTS Growatt inverter shows PV Voltage High (Error 202) PANELS AND GENERATION Growatt inverter shows PE abnormal or NE abnormal (Error 303) WIRING AND ELECTRICAL SAFETY Growatt inverter shows AFCI Fault (Error 200) or AFCI self-test fault (Error 425) WIRING AND ELECTRICAL SAFETY Growatt shows Warning 401 meter fault, CT LN Reversed (Error 306) or pairing errors (307, 308) MONITORING AND BILLING Growatt shows PV1 or PV2 Circuit short (Warning 203) PANELS AND GENERATION Growatt inverter shows Over Temperature or NTC Temperature too high (Error 408) INVERTER FAULTS Growatt inverter shows an internal error (Error 402–420) INVERTER FAULTS Growatt SPH hybrid shows BMS COM Fault (Error 500), Battery Open (506) or Battery reversed (505) BATTERIES Growatt SPH backup cuts out: EPS Over Load (Error 607) or EPS Volt Low (604) BACKUP AND LOAD-SHEDDING Growatt SPF shows Overload (Warning 07, Fault 07) or Output short circuit (Fault 05) BACKUP AND LOAD-SHEDDING Growatt SPF shows Low battery (Warning 04) or shuts down at start-up BATTERIES Growatt SPF shows Battery over-charged (Fault 03) or Bus voltage high (Fault 08) BATTERY CHARGING Growatt SPF shows Fan locked (01) or Over temperature (02) INVERTER FAULTS Growatt SPF shows BMS communication error (Warning 20, 33) or lithium battery warnings (34–45) BATTERIES Growatt SPF runs on battery even though WAPDA is on BACKUP AND LOAD-SHEDDING Growatt SPF solar not charging: Warning 12, 13 or 14 BATTERY CHARGING Growatt SPF parallel system faults (Warning 15–17, Fault 60, 80, 81) INVERTER FAULTS Huawei SUN2000 shows Grid Overvoltage (2034) or Transient AC Overvoltage (2072) INVERTER FAULTS Huawei SUN2000 shows Grid Undervoltage (2033) INVERTER FAULTS Huawei SUN2000 shows Grid Loss (2032) BACKUP AND LOAD-SHEDDING Huawei SUN2000 shows Grid Overfrequency, Underfrequency or Unstable Frequency (2036, 2037, 2038) INVERTER FAULTS Huawei three-phase inverter shows Grid Voltage Imbalance (2035) THREE-PHASE SYSTEMS Huawei SUN2000 shows Low Insulation Resistance (2062) INVERTER FAULTS Huawei SUN2000 shows Abnormal Residual Current (2051) INVERTER FAULTS Huawei SUN2000 shows Abnormal Grounding (2061) or Phase Wire Short-Circuited to PE (2031) WIRING AND ELECTRICAL SAFETY Huawei SUN2000 shows High String Input Voltage (2001) PANELS AND GENERATION Huawei SUN2000 shows String Reverse Connection (2011) PANELS AND GENERATION Huawei SUN2000 shows String Current Backfeed (2012) PANELS AND GENERATION Huawei SUN2000 shows DC Arc Fault (2002) or AFCI Self-Check Failure (2021) WIRING AND ELECTRICAL SAFETY Huawei SUN2000 shows Cabinet Overtemperature (2063) INVERTER FAULTS Huawei SUN2000 shows Device Fault (2064) or all three lights steady red INVERTER FAULTS Huawei SUN2000 shows Faulty Power Collector (2067): meter disconnected MONITORING AND BILLING Huawei SUN2000 shows Upgrade Failed or Version Mismatch (2065) MONITORING AND BILLING Huawei SUN2000 shows Abnormal PV Module Configuration (2080) or Optimizer Fault (2081) PANELS AND GENERATION Huawei SUN2000-L1 backup keeps cutting out: off-grid overload BACKUP AND LOAD-SHEDDING Huawei SUN2000 LED lights: green, orange and red explained INVERTER FAULTS Huawei SUN2000 shows Output Overcurrent (2039) or Output DC Component Overhigh (2040) INVERTER FAULTS GoodWe inverter shows Grid Power Outage (F01) or Anti-islanding Protection (F09) BACKUP AND LOAD-SHEDDING GoodWe inverter shows Grid Overvoltage (F02, F04) or 10-minute Overvoltage (F05) INVERTER FAULTS GoodWe inverter shows Grid Undervoltage (F03) INVERTER FAULTS GoodWe inverter shows Grid Overfrequency, Underfrequency or Frequency Instability (F06, F07, F08) INVERTER FAULTS GoodWe three-phase inverter shows Grid Phase Loss (F44), Voltage Imbalance (F45) or Phase Sequence Failure (F46) THREE-PHASE SYSTEMS GoodWe inverter shows Low Insulation Resistance (F18, F155) INVERTER FAULTS GoodWe inverter shows GFCI Protection (F12–F15) INVERTER FAULTS GoodWe inverter shows Grounding Abnormal (F19), PE Loss (F145) or L-PE Short Circuit (F49) WIRING AND ELECTRICAL SAFETY GoodWe inverter shows PV Input Overvoltage (F37) PANELS AND GENERATION GoodWe inverter shows PV String Mismatch (F142) or PV String Loss (F99, F100) PANELS AND GENERATION GoodWe inverter shows DC Arcing Failure (F42) or AFCI Check Failure (F34) WIRING AND ELECTRICAL SAFETY GoodWe inverter shows Cabinet or Module Overtemperature (F35, F65–F68) INVERTER FAULTS GoodWe inverter shows Internal or External Fan Abnormal (F132, F133) INVERTER FAULTS GoodWe inverter shows Relay Check Abnormal (F32) or Relay Failure (F64) INVERTER FAULTS GoodWe inverter shows an internal fault (Bus, IGBT, CPU, HCT or Internal Comm Loss) INVERTER FAULTS GoodWe shows Meter Comm Loss (F140), CT Not Connected (F143) or CT Reversed (F144) MONITORING AND BILLING GoodWe hybrid backup cuts out: Back-up Output Overload (F55) BACKUP AND LOAD-SHEDDING GoodWe hybrid battery faults: reversed (F124), abnormal input (F126), over-temperature (F127), low voltage (F152) BATTERIES GoodWe inverter shows AC or DC SPD Failure (F130, F131) WIRING AND ELECTRICAL SAFETY GoodWe hybrid shows generator faults (F22–F27) PUMPS, GENERATORS AND OTHER LOADS Solis inverter shows NO-Grid BACKUP AND LOAD-SHEDDING Solis inverter shows OV-G-V (grid overvoltage) INVERTER FAULTS Solis inverter shows UN-G-V (grid undervoltage) INVERTER FAULTS Solis inverter shows OV-G-F or UN-G-F (grid frequency) INVERTER FAULTS Solis inverter shows PV ISO-PRO01 or PV ISO-PRO02 (ground fault) INVERTER FAULTS Solis inverter shows ILeak-PRO (leakage current) INVERTER FAULTS Solis inverter shows OV-DC01 or OV-DC02 (PV input overvoltage) PANELS AND GENERATION Solis inverter shows OV-TEM or LmtByTemp (overheating) INVERTER FAULTS Solis hybrid backup cuts out: Over-Load, OV-Vbackup or OV-ILLC BACKUP AND LOAD-SHEDDING Solis hybrid shows CAN Fail, NO-Battery or BatName-FAIL BATTERIES Solis hybrid shows OV-Vbatt or UN-Vbatt (battery voltage) BATTERIES Solis inverter shows ARC-FAULT or AFCI-Check WIRING AND ELECTRICAL SAFETY Solis shows Fail safe or Meter Comm Fail MONITORING AND BILLING Solis screen shows LmtByVg, LmtByFreq, LmtByTemp or LmtByEPM: why is power limited? PANELS AND GENERATION Solis S6-EO off-grid inverter alarms: No Battery, BMS alarms, Output Short Circuit BATTERIES Fronus on-grid inverter shows Grid Lost Fault BACKUP AND LOAD-SHEDDING Fronus inverter shows Grid Volt Fault, Grid Freq Fault or Grid Volt M Fault INVERTER FAULTS Fronus inverter shows IsoFault or ISO_FAIL (insulation) INVERTER FAULTS Fronus inverter shows PV Volt Fault or PV_01_VOLT_HIGH PANELS AND GENERATION Fronus inverter shows PV_01_REVERSE or PvConnDirFault (panels wired the wrong way) PANELS AND GENERATION Fronus Genki hybrid backup cuts out: EPS_OVERLOAD or EPS_OVERLOAD_LOCK BACKUP AND LOAD-SHEDDING Fronus Genki shows BAT_BMS_COMM_FAULT or BAT_TYPR_CFG_ERR BATTERIES Fronus Genki shows BAT_SOC_LOW or BMS low voltage faults BATTERIES Fronus battery shows BMS_TEMP_OVER_FAULT or BMS_TEMP_LOW_FAULT BATTERY CHARGING Fronus battery shows BMS relay, cell or system faults BATTERIES Fronus inverter shows OverTempFault, FanFault or AcTerminalOTP INVERTER FAULTS Fronus inverter shows TzFault, BusVoltFault, relay or other internal faults INVERTER FAULTS Fronus shows Meter Fault or NO_PWR_METER MONITORING AND BILLING Sineng inverter shows Alarm 1: Power grid voltage exception INVERTER FAULTS Sineng inverter shows Alarm 4: Power grid frequency exception INVERTER FAULTS Sineng inverter shows Alarm 5: No mains BACKUP AND LOAD-SHEDDING Sineng three-phase inverter shows Alarm 6: Phase reversed / Grid Sequence THREE-PHASE SYSTEMS Sineng inverter shows Alarm 7 GFCI fault or Alarm 8 ISO fault INVERTER FAULTS Sineng inverter shows Alarm 10: NPE voltage exception WIRING AND ELECTRICAL SAFETY Sineng inverter shows Alarm 23: High temperature INVERTER FAULTS Sineng inverter shows Alarm 40 PV over-voltage or Alarm 42 PV More Panels PANELS AND GENERATION Sineng inverter shows Alarm 41: PV reversely connected PANELS AND GENERATION Sineng inverter shows Alarm 39: AFCI fault WIRING AND ELECTRICAL SAFETY Sineng hybrid shows Alarm 12 EPS Overload or Alarm 55 EPS over current BACKUP AND LOAD-SHEDDING Sineng inverter shows Alarm 21 Device fault, 25 Communication or 33 Bus over-voltage INVERTER FAULTS SolaX inverter shows IE 50 Grid_Loss BACKUP AND LOAD-SHEDDING SolaX inverter shows IE 51, IE 53, IE 55 or IE 56 (grid voltage) INVERTER FAULTS SolaX inverter shows IE 57 (grid frequency) INVERTER FAULTS SolaX inverter shows IE 00 ISO_Fail (insulation) INVERTER FAULTS SolaX inverter shows IE 04 Gnd_Conn_Err (grounding fault) WIRING AND ELECTRICAL SAFETY SolaX inverter shows IE 11 PV_Reverse PANELS AND GENERATION SolaX inverter shows IE 20 PV_VolHigh PANELS AND GENERATION SolaX inverter shows IE 01 Meter_Oppsite (meter direction wrong) MONITORING AND BILLING SolaX inverter shows IE 80–85 (temperature) or IE 94/95 (fan) INVERTER FAULTS SolaX inverter shows IE 78 GFCI_Err or IE 77 GFCI_CT_Err INVERTER FAULTS SolaX inverter shows IE 96 or IE 97 (lightning protection) WIRING AND ELECTRICAL SAFETY SolaX inverter shows bus, relay or internal faults (IE 60–76, IE 91–93) INVERTER FAULTS Solplanet inverter shows E34 (grid voltage) INVERTER FAULTS Solplanet inverter shows E35 (grid not available) BACKUP AND LOAD-SHEDDING Solplanet inverter shows E33 (grid frequency) INVERTER FAULTS Solplanet inverter shows E38 (PV insulation) INVERTER FAULTS Solplanet inverter shows E36 or E65 (grounding) WIRING AND ELECTRICAL SAFETY Solplanet inverter shows E37 or E46 (PV voltage) PANELS AND GENERATION Solplanet inverter shows E40 (over temperature) INVERTER FAULTS Solplanet inverter shows a permanent fault (E01–E10) or E56–E58 INVERTER FAULTS Solplanet warning codes 31–174: what they mean PANELS AND GENERATION SAJ inverter shows Phase Voltage High or Low (codes 9–15) INVERTER FAULTS SAJ inverter shows No Grid Error (24) or Islanding (37) BACKUP AND LOAD-SHEDDING SAJ inverter shows Grid Frequency High or Low (18, 19) INVERTER FAULTS SAJ inverter shows ISO Error (31) or GFCI Error (27) INVERTER FAULTS SAJ inverter shows Master Relay Error (1) INVERTER FAULTS SAJ inverter shows Temperature High (3) or Fan Error (45–48) INVERTER FAULTS SAJ inverter shows DC Reverse Connect Error (25) PANELS AND GENERATION SAJ inverter shows Bus Voltage High (33) or PV Voltage High (36) PANELS AND GENERATION SAJ H2 hybrid shows OffGrid Voltage Low (16) or Output Shorter (17) BACKUP AND LOAD-SHEDDING SAJ H2 hybrid shows BMS Lost Connection (55) or battery faults (54, 89–104) BATTERIES SAJ inverter shows Arc Error (87) or Arc Device fault (83) WIRING AND ELECTRICAL SAFETY SAJ shows Lost Communication between inverter and meter (59) MONITORING AND BILLING
Safety
Never open the DC side yourself.
Solar strings stay live whenever there is daylight, even with the inverter switched off. Leave DC isolators, MC4 connectors and battery terminals to us. Switching off the AC supply does not make the DC side safe.
Support for systems we installed is part of the deal. If someone else installed yours, we will still look at it, and we will tell you what it needs.