Solis PV inverter displaying a fault code?
Sometimes a problem indicated can be resolved without the need to call anyone out or replace hardware. If not then it might give a clue as to what the root cause could be.
- Check to see if your fault code is in the list below.
- All fault codes shown are manufacturer supplied.
- Follow any manufacturers advice indicated next to your error code.
- Many inverters will show an error indicating an internal failure, this usually means a replacement is required, call us for advice or a quote.
- If your inverter does not have a screen and is off-line you could try our home troubleshooting guide to try to get your solution working again.
- If all else fails we would be happy to take your call on 0330 345 3400
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These Solis fault codes are for most recent models/revisions, 4G, 5G, S6
| Alarm Code or Issue | Brief Explanation of Alarm | Basic Troubleshooting Steps |
| AFCI Check FAULT | • AFCI module self check fault | Reset Inverter • DC switch OFF • Wait until all lights/ LCD turn off • DC switch ON • Replace inverter |
| 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 |
| Initializing: Inverter stuck in this mode | Inverter is waiting for the driving signal from the DSP | RMA – the inverter is not receiving a signal from the DSP board or it has a faulty internal power board |
| OV-G-V: Over-Grid-Voltage Alarm | Inverter detects the grid voltage as too high – has multiple iterations: V01, V02, V03, V04, and V05 | 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: Under-Grid-Voltage Alarm | Inverter detects the grid voltage as too low | 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: Over-Grid-Frequency Alarm | Inverter detects the grid frequency as too high | 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: Under-Grid-Frequency Alarm | Inverter detects the grid | 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 Alarm | Inverter does not detect any grid voltage | 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: DC voltage is too high | • Inverter detects High DCV | 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 | Inverter detects high DC voltage on the internal bus | 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 | Inverter detects low DC voltage on the internal bus | 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 01/02/03/04: Current leakage to ground | Current leakage on the AC or the DC circuit | Consult the article because this one is more complex |
| Fan-Fail | One or more of the inverter fans is not operating | Test – DC switch ON
|
| GRID-INTF: unstable grid or faulty power board | Inverter detects grid instability, internal fault current high | 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: DC Interference Fault | DC interference – faulty internal component | Test – With DC Switch OFF
|
| G-IMP | High grid impedance | 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: Temperature Protection | • 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 01/02: 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 |
| ARC-Fault: An arc fault has been detected | Inverter detects an arc in the DC circuit | Inspect installation • Physically check cables • Inspect panel junction boxes • Inspect cable connections • Reset inverter • Replace inverter |
| IG-AD: Grid current sampling failure | Internal component failure | Fault caused by internal component failure – 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 |
| LimbyTemp | Temp Below 17C. Inv Could limit power to 50% | 1. Wait until internal temperature rises above 17C |
| Relay-Fault | Relay check fault | Restart inverter or contact installer. |
| DCinj-Fault | High DC injection current | Restart inverter or contact installer. |
| Stuck in Soft Run Mode | RMA | |
| IGFOL-F | Grid Current Tracking Error | Restart the inverter – if the alarm persists, RMA |
For the RHI-1P(5-10)K-HVES-5G series
Alarm Code or Issue | Failure Description | Solution |
High current demand from the backup loads or a faulty outlet | There is too much draw on the backup loads panel > 25A reduce the | |
AC Transient over current | AC Transient Overcurrent | Check if the backup port is shorted, restart the inverter |
Output power reduced due to Export Power configuration | Output power is being limited because the system is currently set up | |
Limited by grid voltage | If Rule 21 is unnecessary, then set working mode to “NULL” | |
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 |
OV-ILLC | LLC Hardware Overcurrent | Restart the inverter |
OV-Vbatt | Battery Overvoltage | Check if the battery overvoltage setting is reasonable, if the battery |
UN-Vbatt | Battery Undervoltage | Check if the battery undervoltage setting is reasonable, if the |
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 |
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 |
FailSafe | Inverter and meter communication failure -FailSafe is enabled | Troubleshoot communication between the inverter and meter. See the |
Inverter and external (Acrel) meter are not communicating | Make sure the RS485 between the inverter and meter is installed | |
CAN_Comm_FAIL | Battery CAN Fail | Check if the CAN cable is correctly connected or the cables are |
DSP_Comm_FAIL | DSP COM Fail | Restart the inverter |
Alarm-BMS | Battery BMS Alarm | Retart the battery, if fault still exists, please contact battery |
No communication between the inverter and battery OR the wrong battery | Check the RS485 or CAN wire between the inverter and battery. Verify | |
LG-DDC-OV | LG Battery overvoltage | Turn both battery breaker off and then back on again after ten |
LG-Comm-FAIL | LG Battery Com Fail | Check the RS485 cable of LG battery. Ensure it is correctly connected |
LG-BMS-Fault | LG BMS is having it’s own fault and the inverter is just relaying the | Restart the battery. If the fault still exists, contact LG for assistance |
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 |
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 |
LimByVg | Limited by grid voltage | If Rule 21 is unnecessary, then set working mode to “NULL” |
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 |
OV-ILLC | LLC Hardware Overcurrent | Restart the inverter |
OV-Vbatt | Battery Overvoltage | Check if the battery overvoltage setting is reasonable, if the battery |
UN-Vbatt | Battery Undervoltage | Check if the battery undervoltage setting is reasonable, if the |
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 |
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 |
FailSafe | Inverter and meter communication failure -FailSafe is enabled | Troubleshoot communication between the inverter and meter. See the |
MET_Comm-FAIL | Inverter and external (Acrel) meter are not communicating | Make sure the RS485 between the inverter and meter is installed |
CAN_Comm_FAIL | Battery CAN Fail | Check if the CAN cable is correctly connected or the cables are |
DSP_Comm_FAIL | DSP COM Fail | Restart the inverter |
Alarm-BMS | Battery BMS Alarm | Retart the battery, if fault still exists, please contact battery |
BAT_Comm-FAIL | No communication between the inverter and battery OR the wrong battery | Check the RS485 or CAN wire between the inverter and battery. Verify |
LG-DDC-OV | LG Battery overvoltage | Turn both battery breaker off and then back on again after ten |
LG-Comm-FAIL | LG Battery Com Fail | Check the RS485 cable of LG battery. Ensure it is correctly connected |
LG-BMS-Fault | LG BMS is having it’s own fault and the inverter is just relaying the | Restart the battery. If the fault still exists, contact LG for assistance |
Alarm Code or Issue | Failure Description | Solution |
High current demand from the backup loads or a faulty outlet | There is too much draw on the backup loads panel > 25A reduce the | |
AC Transient over current | AC Transient Overcurrent | Check if the backup port is shorted, restart the inverter |
Output power reduced due to Export Power configuration | Output power is being limited because the system is currently set up | |
Limited by grid voltage | If Rule 21 is unnecessary, then set working mode to “NULL” | |
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 |
OV-ILLC | LLC Hardware Overcurrent | Restart the inverter |
OV-Vbatt | Battery Overvoltage | Check if the battery overvoltage setting is reasonable, if the battery |
UN-Vbatt | Battery Undervoltage | Check if the battery undervoltage setting is reasonable, if the |
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 |
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 |
FailSafe | Inverter and meter communication failure -FailSafe is enabled | Troubleshoot communication between the inverter and meter. See the |
Inverter and external (Acrel) meter are not communicating | Make sure the RS485 between the inverter and meter is installed | |
CAN_Comm_FAIL | Battery CAN Fail | Check if the CAN cable is correctly connected or the cables are |
DSP_Comm_FAIL | DSP COM Fail | Restart the inverter |
Alarm-BMS | Battery BMS Alarm | Retart the battery, if fault still exists, please contact battery |
No communication between the inverter and battery OR the wrong battery | Check the RS485 or CAN wire between the inverter and battery. Verify | |
LG-DDC-OV | LG Battery overvoltage | Turn both battery breaker off and then back on again after ten |
LG-Comm-FAIL | LG Battery Com Fail | Check the RS485 cable of LG battery. Ensure it is correctly connected |
LG-BMS-Fault | LG BMS is having it’s own fault and the inverter is just relaying the | Restart the battery. If the fault still exists, contact LG for assistance |
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 |
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 |
LimByVg | Limited by grid voltage | If Rule 21 is unnecessary, then set working mode to “NULL” |
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 |
OV-ILLC | LLC Hardware Overcurrent | Restart the inverter |
OV-Vbatt | Battery Overvoltage | Check if the battery overvoltage setting is reasonable, if the battery |
UN-Vbatt | Battery Undervoltage | Check if the battery undervoltage setting is reasonable, if the |
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 |
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 |
FailSafe | Inverter and meter communication failure -FailSafe is enabled | Troubleshoot communication between the inverter and meter. See the |
MET_Comm-FAIL | Inverter and external (Acrel) meter are not communicating | Make sure the RS485 between the inverter and meter is installed |
CAN_Comm_FAIL | Battery CAN Fail | Check if the CAN cable is correctly connected or the cables are |
DSP_Comm_FAIL | DSP COM Fail | Restart the inverter |
Alarm-BMS | Battery BMS Alarm | Retart the battery, if fault still exists, please contact battery |
BAT_Comm-FAIL | No communication between the inverter and battery OR the wrong battery | Check the RS485 or CAN wire between the inverter and battery. Verify |
LG-DDC-OV | LG Battery overvoltage | Turn both battery breaker off and then back on again after ten |
LG-Comm-FAIL | LG Battery Com Fail | Check the RS485 cable of LG battery. Ensure it is correctly connected |
LG-BMS-Fault | LG BMS is having it’s own fault and the inverter is just relaying the | Restart the battery. If the fault still exists, contact LG for assistance |
Remember, our engineering staff are never more than an hour away and can have you back up and running in no time
Give us a call, we will take your details, arrange an engineer, and aim to resolve your solar problem as soon as possible.
Photos are always an effective way to show us your problem too.
Call Bolido Solar on 0330 345 3400 or use the inquiry form and we will call you back
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4 weeks ago
Scott designed and carried out a PV cell installation recently. The quote was competitive and the correspondence quick and concise. The fitting was arranged within a week, once the specification was agreed. On site, assisted by Mike, they were helpful and friendly and despite a difficult routing for the cable they came up with a successful solution. The end result is a very tidy, externally & internally, solar fit for the property. Great job and communication throughout, overall I'm very satisfied with their service and would recommend them.
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3 weeks ago
Thank you for your outstanding service we received with regards to our solar panels which needed a new inverter. In next to no time, the problem was identified, a replacement ordered, delivered and fitted and the solar panels immediately started to record our readings. I have 100% confidence in recommending Bolido!
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2 weeks ago
Very refreshing to get such a thorough and decent service. My company, a solar installations company needed technical assistance on-site for two projects. We also needed help with some of our own IT systems particularly with providing secure internet and network access between us and our clients, primarily for sharing power generation data but also increasingly alongside power usage data. Scott and his team were great with our clients and we just left to it. They were also quick to understand exactly what we wanted to achieve. They carried out all of the work, quickly, cleanly and with the minimum of fuss. We are now in a great position network and IT wise, moving forward we are confident in being able to service bigger clients with however sophisticated a network solution they might require. Highly recommend this company.
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1 week ago
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