Alarm Code Overview for Solis Inverters


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 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 name to view the troubleshooting article specific to that alarm. 


Alarm Code or IssueBrief Explanation of Alarm
Basic Troubleshooting Steps 
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 modeInverter 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
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 AlarmInverter 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 AlarmInverter 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
frequency as too low

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 AlarmInverter 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 DCVTest – 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 highInverter 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 lowInverter detects low DC voltage on the internal busTest
• 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 circuitConsult the article because this one is  more complex
GRID-INTF: unstable grid or faulty power boardInverter 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 - faulty internal component RMA
G-IMPHigh 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
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
ARC-Fault: An arc fault has been detectedInverter 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-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 IssueFailure DescriptionSolution
AC OvercurrentHigh current demand from the backup loads or a faulty outletThere 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 currentAC Transient OvercurrentCheck if the backup port is shorted, restart the inverter
LmtByPLmt
Output power reduced due to Export Power configurationOutput 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 voltageIf 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-IIGBT OvercurrentRestart the inverter
OV-IgTrGrid Transient OvercurrentRestart the inverter
OV-Vbatt-HBattery Hardware OvercurrentCheck if the battery is correctly connected or the battery contactor is disconnected, restart the battery, restart the inverter
OV-ILLCLLC Hardware OvercurrentRestart the inverter
OV-VbattBattery OvervoltageCheck if the battery overvoltage setting is reasonable, if the battery reaches its end of life
UN-VbattBattery UndervoltageCheck if the battery undervoltage setting is reasonable, if the battery reaches its end of life
DSP-B-FAULTSlave DSP Check ErrorRestart the inverter
NO-BatteryBattery Not ConnectedCheck if the battery is correctly connected or the battery contactor is disconnected, Restart the battery
OV-VbackupInverting OvervoltageRestart the inverter
Over-LoadBackup OverloadCheck if the backup port is shorted or the load is larger than the limitation
FailSafeInverter 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 communicatingMake sure the RS485 between the inverter and meter is installed properly. If no meter is installed, change to "No Meter"
CAN_Comm_FAILBattery CAN FailCheck if the CAN cable is correctly connected or the cables are broken/loosen
DSP_Comm_FAILDSP COM FailRestart the inverter
Alarm-BMSBattery BMS AlarmRetart 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 selectedCheck 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-OVLG Battery overvoltage Turn both battery breaker off and then back on again after ten minutes. 
LG-Comm-FAILLG Battery Com FailCheck the RS485 cable of LG battery. Ensure it is correctly connected without broken insulation
LG-BMS-FaultLG BMS is having it's own fault and the inverter is just relaying the messageRestart the battery. If the fault still exists, contact LG for assistance


T
Travis is the author of this solution article.

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