This article serves as an overview of all Solis alarm codes. Please use it to quickly find the article that you need depending on the alarm code you are experiencing.
For the Solis RHI-1P(5-10)K-HVES-5G-US (hybrid energy storage) inverter alarms, please scroll down and use the second chart.
Click or tap the Alarm Code/Issue name to see the troubleshooting guide specific to that issue
| Alarm Code or Issue | Possible Cause(s) | Basic Troubleshooting Steps |
| AFCI: an arc-fault is detected | • Loose connection/termination • Damaged PV module • MLRSD failure/incompatibility | Test - DC switch OFF • Check PV strings with a megger • Plug one string in at a time to see which string causes arc-fault • Check all connection points and modules with a thermal camera |
| No Information - Blank Screen | • DC input voltage low/missing • DC string polarity reversed • Internal DC short - RMA | Test – DC switch OFF • Check string polarity to make sure it is not reversed • Check DC string voltages >120V Single, >350V three Test – DC Switch ON • Check DC string voltages again >120V Single, >350V three • If DC voltage is “0” replace inverter - internal DC short - RMA If DC voltages are all normal but inverter won't turn on - RMA |
| Inverter stuck displaying "Initializing" | • Inverter is waiting for the | • Contact Solis Support (RMA) • Contact he inverter is not receiving a signal from the DSP board or it has a faulty internal power board |
| OV-G-V: AC voltage is over the limit | • The wrong grid standard has been selected (must be US) • The grid voltage is high • The inverter is measuring the voltage as higher than it actually is | Test – DC switch OFF • Check AC at the inverter • If AC measures high, adjust upper limit with permission from utility Test – DC Switch ON, full power • Check AC at inverter test points • Compare with LCD • If AC measures high, cables between inverter and interconnect are too small • Check ampacity and voltage drop calculations |
| UN-G-V: AC voltage is under the limit | • The wrong grid standard has been selected (must be US) • The grid voltage is low • The inverter is measuring the voltage as lower than it actually is | Test – DC switch OFF • Check AC at the inverter test points • If AC measures low, adjust lower limit with permission from utility • Check LCD voltage reading, may be a bad measurement circuit Test – DC Switch ON • Check grid standard • Replace inverter |
| OV-G-F: grid frequency is over the limit | • The wrong grid standard has been selected (must be US) • The grid frequency is high • The inverter is measuring the frequency as higher than it actually is | Test – DC switch OFF • Check frequency at the inverter test points • If frequency measures high, adjust upper limit with permission from utility • Check LCD reading, may be a bad measurement circuit Test – DC Switch ON • Check grid standard • Replace inverter |
| UN-G-F: grid frequency is under the limit | • The wrong grid standard has been selected (must be US) • The grid frequency is low • The inverter is measuring the frequency as lower than it actually is | Test – DC switch OFF • Check frequency at the inverter test points • If frequency measures low, adjust upper limit with permission from utility • Check LCD reading, may be a bad measurement circuit Test – DC Switch ON • Check grid standard • Replace inverter |
| NO-Grid: inverter does not detect any AC voltage | • The AC switch/breaker is off • The DC switch was turned on before the AC switch - sometimes this results in the inverter stuck displaying "No-Grid" | Potential Resolution: Turn the DC switch off and leave it off until the screen goes blank. Then turn on the AC switch followed by the DC switch. Wait to make sure the system begins generating after five minutes. If this does not work, proceed with the steps below. Test – DC switch OFF • Measure the AC voltage at the AC grid input terminals • L1-L2, L1-L3, L2-L3, L1-GND, L2-GND, L3-GND • Check the AC voltages found in the Information menu, if they do not match your multimeter - RMA (send a photo of this) |
| OV-DC: PV voltage is over the limit | • PV string voltage is too high • Internal DC voltage sensors are faulty | Test – DC switch OFF • Check DC at the inverter test points • If DCV is high, too many panels in the string Test – DC Switch ON • Check LCD reading, may be a bad measurement circuit • Replace inverter |
| OV-BUS: DC bus voltage is too high | • Internal component failure is likely | Test • Measure DC and AC voltages with a multimeter • Compare with voltages found in the Information menu • If multimeter and display voltages do not match - RMA • If the values do match, ensure that they do not exceed the inverter specifications. If they do, reconfigure your PV strings to have lower voltage so that it is within spec |
| UN-BUS: DC bus voltage is too low | • PV string voltage is too low • Internal component failure is likely | Test • Measure DC and AC voltages with a multimeter • Compare with voltages found in the Information menu • If multimeter and display voltages do not match - RMA • If the values do match, ensure that they do not exceed the inverter specifications. If they do, reconfigure your PV strings to have lower voltage so that it is within spec |
| ILeak-PRO: current leakage to ground detected | • An exposed AC or DC conductor making contact with something metallic • A faulty PV module could be causing a leakage to ground | • See the guide - tap/click the link to be taken to it |
| Fan-Fail: an internal or an external fan has stopped working | • A fan has become clogged with debris such as grass or a bug nest • If the temperature is at or below freezing, a fan may have some ice build-up • The fan may connection may be loose | Test - DC switch ON
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| PID Repairing: low DC voltage or DSP issues | • Low/no DC voltage with AC switched turned on • Missing/corrupt DSP firmware • Faulty DSP board | • Check the DC voltage - if it is lower than the startup voltage this is why PID Repairing is displayed - fix the DC voltage, then power-cycle the inverter • If the DC voltage is normal and the DC switch is ON but PID Repairing is still displayed, see the article by clicking the link |
| GRID-INTF: harmonic distortion (line noise) on the AC-side | • Could be inverter, the utility, or local nonlinear electrical equipment causing the noise | Test – With DC Switch OFF • Measure AC voltage • Test AC line for THD • Test – With DC Switch ON Test AC line for THD • Multiple inverters/turn one off • Impedance matching adjustment or box • Internal damage • Wire came loose in shipping |
| DC-INTF: abnormality on the DC side of the system | • Ground-fault • DC interference caused by a faulty internal component • DC interference caused by a faulty external component (such as module-level rapid shutdown equipment) | Test – With DC Switch OFF
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| G-IMP | • High grid impedance detected | Use the User-Define grid standard so you can adjust the protection limit if it is allowed by the utility |
| INI-FAULT: Initialization Protection | • Master and Slave DSP have different values | Reset Inverter • DC switch OFF • Wait until all lights/LCD turn off • DC switch ON • Replace inverter |
| OV-TEM: inverter internal temperature is too high | • Inverter detects high ambient temperature >60C | Inspect installation • Check heatsink for obstructions/ventilation • Is inverter in direct sunshine • Measure ambient temperature near inverter • If temp is in range replace inverter |
| PV ISO-PRO: ground-fault detected on the DC side | • Inverter detects low DC insulation resistance - ground fault on one of the PV strings | Inspect installation • Reset inverter • Note weather conditions when alarm occurs • Measure insulation resistance • If normal, measure in SAME weather as alarm • Physically check cables • Replace inverter |
| IG-AD: grid current sampling failure | • Internal component failure | • Contact Solis Support (RMA) |
| LimByVg: power curtailed due to grid voltage | • Power is being curtailed because of the grid voltage being too high or too low | • Inspect panel junction boxes • Inspect cable connections • Reset inverter • Replace inverter |
| LimbyTem: power curtailed due to extreme temperature | • Power is being curtailed because the internal temperature is too high or too low | • Check the internal temperature of the inverter through Advanced Information > Running Status • Temperature must be between -17°C and 40°C for 100% of max. power output (1.4°F and 104°F) • Inverter will derate above/below those temperatures |
| Relay-PRO | • An inverter internal relay has malfunctioned | • Power-cycle the inverter • If the alarm persists, contact Solis Support (RMA) |
| DCinj-Fault | • High DC injection current | • Power-cycle the inverter |
| Softrun: inverter is running w/ relays open until the grid voltage & frequency is matched | • As the inverter starts up, it is common for the Softrun message to display | • If the inverter gets stuck displaying Softrun, please see the guide by following the link |
| IGFOL-F | Grid Current Tracking Error | Restart the inverter - if the alarm persists, RMA |
For the RHI-1P(5-10)K-HVES-5G-US series, please use the chart below for any alarms not listed above - these alarms are unique to the hybrid inverter series and will not be seen on any other Solis inverter models.
***Click or tap the Alarm Code name to see the on how to troubleshoot that specific alarm***
| Alarm Codes and Issues for Solis RHI-1P(5-10)K-HVES-5G-US | ||
| Alarm Code or Issue | Failure Description | Solution |
| AC Overcurrent | High current demand from the backup loads or a faulty outlet | There is too much draw on the backup loads panel > 25A reduce the current draw or install a 25A supply breaker so there is an OCPD in place - check to make sure no outlets are tripping |
| AC Transient over current | AC Transient Overcurrent | Check if the backup port is shorted, restart the inverter |
| LmtByPLmt | Output power reduced due to Export Power configuration | Output power is being limited because the system is currently set up for minimum export. Please see Export Power Set on how to change this if you want the system to be exporting power. |
| LimByVg | Limited by grid voltage | If Rule 21 is unnecessary, then set working mode to "NULL" but if Rule 21 is required, know that this code is designed to protect the inverter and is normal but if the code is given for long periods of time then it could mean there is an issue with the inverter or grid. |
| IGBT-OV-I | IGBT Overcurrent | Restart the inverter |
| OV-IgTr | Grid Transient Overcurrent | Restart the inverter |
| OV-Vbatt-H | Battery Hardware Overcurrent | Check if the battery is correctly connected or the battery contactor is disconnected, restart the battery, restart the inverter |
| OV-ILLC | LLC Hardware Overcurrent | Restart the inverter |
| OV-Vbatt | Battery Overvoltage | Check if the battery overvoltage setting is reasonable, if the battery reaches its end of life |
| UN-Vbatt | Battery Undervoltage | Check if the battery undervoltage setting is reasonable, if the battery reaches its end of life |
| DSP-B-FAULT | Slave DSP Check Error | Restart the inverter |
| NO-Battery | Battery Not Connected | Check if the battery is correctly connected or the battery contactor is disconnected, Restart the battery |
| OV-Vbackup | Inverting Overvoltage | Restart the inverter |
| Over-Load | Backup Overload | Check if the backup port is shorted or the load is larger than the limitation |
| FailSafe | Inverter and meter communication failure -FailSafe is enabled | Troubleshoot communication between the inverter and meter. See the article FailSafe on how to disable this setting if you do not want it enabled. |
| MET_Comm-FAIL | Inverter and external (Acrel) meter are not communicating | Make sure the RS485 between the inverter and meter is installed properly. If no meter is installed, change to "No Meter" |
| CAN_Comm_FAIL | Battery CAN Fail | Check if the CAN cable is correctly connected or the cables are broken/loosen |
| DSP_Comm_FAIL | DSP COM Fail | Restart the inverter |
| Alarm-BMS | Battery BMS Alarm | Retart the battery, if fault still exists, please contact battery manufacturer or installer |
| BAT_Comm-FAIL | No communication between the inverter and battery OR the wrong battery is selected | Check the RS485 or CAN wire between the inverter and battery. Verify that the correct battery has been selected in the Battery Select submenu of Advanced Settings |
| LG-DDC-OV | LG Battery overvoltage | Turn both battery breaker off and then back on again after ten minutes. |
| LG-Comm-FAIL | LG Battery Com Fail | Check the RS485 cable of LG battery. Ensure it is correctly connected without broken insulation |
| LG-BMS-Fault | LG BMS is having it's own fault and the inverter is just relaying the message | Restart the battery. If the fault still exists, contact LG for assistance |