Where do these Solis fault codes come from?

Compiled from publicly available Solis inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with Solis.

Which of these can I clear on site?

Some clear on their own once grid or environmental conditions return to normal. Anything involving DC isolation, AC switching, wiring or opening the unit is licensed electrical work. Isolate safely, follow AS/NZS 5033 and AS/NZS 3000 procedure and use appropriate PPE before touching a live system.

The exact code isn't listed. Why not?

Firmware and model variants differ, and manufacturers revise their code tables. We document the most common ones; for a variant that isn't here, check the unit's current manual or the manufacturer's service portal.

How current is this reference?

This reference was last reviewed on 2 August 2026. We revise entries when the underlying manufacturer documentation changes.

Inverter Fault Library

Solis Alarm Codes

Solis alarm vocabulary from official service material, with owner-safe and installer guidance while exact Australian model and firmware applicability remains blank.

Sources listedReviewed August 2026Source: Manufacturer documentationOur methodology

Manufacturer: Solis (Ginlong)
Codes documented: 30
Source: Manufacturer documentation
Scope: Official North American service vocabulary; Australian model and firmware applicability not confirmed

30 of 30 codes

About this fault librarySources · scope

Solis alarm names vary by inverter family and firmware. The reviewed remedies use Solis's official North American complete alarm list plus its global no-display article. That establishes manufacturer provenance, but it does not confirm an Australian variant, a single model family or a firmware range; those fields remain blank. Confirm the exact model and displayed wording before applying an entry. Safety note: owners should record the alarm and safely visible conditions. DC/AC isolation, measurements, connectors, wiring, settings and internal work are licensed-installer tasks performed to the exact model manual.

Key takeaways

30 Solis (Ginlong) fault and alarm codes, documented for the trade.
Compiled from published documentation and field references; Wattbench is independent and not affiliated with Solis (Ginlong).
Codes involving DC/AC isolation, wiring or opening the unit are licensed electrical work. Isolate safely and follow AS/NZS procedure.

Resolution text is manufacturer/service context, not permission for an owner to perform electrical work. Stop at visible observations unless the exact product instructions identify an owner control. Isolation, configuration, testing, opening equipment and wiring are for an appropriately licensed worker and, where required, an SAA-accredited person. Where a card says Product fit is unknown, treat it as brand-level guidance and confirm the exact model, role, regional variant, firmware and current manual before acting.

LCD blank
No display / inverter will not turn on
The LCD or indicators remain blank and the inverter is not starting.
Product fit · Unknown
Show field stepsHide field steps for LCD blank: No display / inverter will not turn on
Product fit · Unknown
Safe checks now
Record that the display and indicators are blank. Do not operate DC equipment or test live circuits; contact the installer to follow the Solis no-display procedure.
Installer remedy
Use the Solis no-display procedure to verify DC input, polarity and start voltage for the exact model under safe isolation. Escalate if valid input is present and the inverter remains dark.
Remedy sourceSolis no-display guide
Manufacturer / escalation handoff
Waiting / SoftRun (init loop)
Waiting or SoftRun does not clear
The inverter remains in a documented start-up state rather than progressing to generation. This is not the same as the separate INI-FAULT alarm.
Product fit · Unknown
Show field stepsHide field steps for Waiting / SoftRun (init loop): Waiting or SoftRun does not clear
Product fit · Unknown
Safe checks now
Record the exact displayed message and system state. Do not change settings, operate isolators or open equipment; contact the installer if the condition remains.
Installer remedy
Follow the matching entry in the Solis alarm list for the exact product and displayed wording. Preserve configuration as found and escalate if the documented checks do not clear the condition.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
OV-G-V01–04
Over grid voltage
The measured grid voltage is above the configured protection limit.
Product fit · Unknown
Show field stepsHide field steps for OV-G-V01–04: Over grid voltage
Product fit · Unknown
Safe checks now
Record the alarm, time and whether the premises supply appears normal. Do not change the grid standard or protection settings; contact the installer if the alarm repeats.
Installer remedy
Check the measured grid condition, AC connection and selected standard using the Solis alarm-list procedure. Preserve approved settings and obtain network approval before any protection-point change.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
UN-G-V01/02
Under grid voltage
The measured grid voltage is below the configured protection limit.
Product fit · Unknown
Show field stepsHide field steps for UN-G-V01/02: Under grid voltage
Product fit · Unknown
Safe checks now
Record the alarm, time and whether the premises supply appears normal. Do not change the grid standard or protection settings; contact the installer if the alarm repeats.
Installer remedy
Check the measured grid condition, AC connection and selected standard using the Solis alarm-list procedure. Preserve approved settings and obtain network approval before any protection-point change.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
OV-G-F01/02
Over grid frequency
The measured grid frequency is above the configured protection limit.
Product fit · Unknown
Show field stepsHide field steps for OV-G-F01/02: Over grid frequency
Product fit · Unknown
Safe checks now
Record the alarm, time and whether the premises supply appears normal. Do not change the grid standard or protection settings; contact the installer if the alarm repeats.
Installer remedy
Check the measured grid condition, AC connection and selected standard using the Solis alarm-list procedure. Preserve approved settings and obtain network approval before any protection-point change.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
UN-G-F01/02
Under grid frequency
The measured grid frequency is below the configured protection limit.
Product fit · Unknown
Show field stepsHide field steps for UN-G-F01/02: Under grid frequency
Product fit · Unknown
Safe checks now
Record the alarm, time and whether the premises supply appears normal. Do not change the grid standard or protection settings; contact the installer if the alarm repeats.
Installer remedy
Check the measured grid condition, AC connection and selected standard using the Solis alarm-list procedure. Preserve approved settings and obtain network approval before any protection-point change.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
Reverse-GRID
AC polarity incorrect
The inverter detects an incorrect AC connection polarity.
Product fit · Unknown
Show field stepsHide field steps for Reverse-GRID: AC polarity incorrect
Product fit · Unknown
Safe checks now
Record the exact displayed message and system state. Do not change settings, operate isolators or open equipment; contact the installer if the condition remains.
Installer remedy
Follow the matching entry in the Solis alarm list for the exact product and displayed wording. Preserve configuration as found and escalate if the documented checks do not clear the condition.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
Reverse-DC
DC polarity reversed
The inverter detects reverse polarity at a DC input.
Product fit · Unknown
Show field stepsHide field steps for Reverse-DC: DC polarity reversed
Product fit · Unknown
Safe checks now
Record the exact alarm and weather conditions, keep clear of the array and do not reset the inverter or operate DC equipment. Arrange a licensed inspection promptly.
Installer remedy
Follow the Solis alarm-list checks for polarity, PV voltage, insulation, leakage or arcing under the exact model's safe-isolation procedure. Rectify the cause before returning the system to service.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
NO-GRID
No grid detected
The inverter cannot detect an acceptable grid supply.
Product fit · Unknown
Show field stepsHide field steps for NO-GRID: No grid detected
Product fit · Unknown
Safe checks now
Record the alarm, time and whether the premises supply appears normal. Do not change the grid standard or protection settings; contact the installer if the alarm repeats.
Installer remedy
Check the measured grid condition, AC connection and selected standard using the Solis alarm-list procedure. Preserve approved settings and obtain network approval before any protection-point change.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
OV-DC01–04
Over DC voltage
The DC input voltage is above the inverter's permitted limit.
Product fit · Unknown
Show field stepsHide field steps for OV-DC01–04: Over DC voltage
Product fit · Unknown
Safe checks now
Record the exact alarm and weather conditions, keep clear of the array and do not reset the inverter or operate DC equipment. Arrange a licensed inspection promptly.
Installer remedy
Follow the Solis alarm-list checks for polarity, PV voltage, insulation, leakage or arcing under the exact model's safe-isolation procedure. Rectify the cause before returning the system to service.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
OV-BUS
Over DC bus voltage
The inverter's internal DC bus voltage is too high.
Product fit · Unknown
Show field stepsHide field steps for OV-BUS: Over DC bus voltage
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
UN-BUS01/02
Under DC bus voltage
The inverter's internal DC bus voltage is too low.
Product fit · Unknown
Show field stepsHide field steps for UN-BUS01/02: Under DC bus voltage
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
GRID-INTF01/02
Grid interference
The inverter detected interference or instability on the grid connection.
Product fit · Unknown
Show field stepsHide field steps for GRID-INTF01/02: Grid interference
Product fit · Unknown
Safe checks now
Record the alarm, time and whether the premises supply appears normal. Do not change the grid standard or protection settings; contact the installer if the alarm repeats.
Installer remedy
Check the measured grid condition, AC connection and selected standard using the Solis alarm-list procedure. Preserve approved settings and obtain network approval before any protection-point change.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
OV-G-I
Over grid current
The inverter measured AC output current above its allowed limit.
Product fit · Unknown
Show field stepsHide field steps for OV-G-I: Over grid current
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
IGBT-OV-I
Over IGBT current
The inverter detected excessive current in its power-conversion stage.
Product fit · Unknown
Show field stepsHide field steps for IGBT-OV-I: Over IGBT current
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
G-IMP
High grid impedance
The inverter measured grid impedance outside its permitted range.
Product fit · Unknown
Show field stepsHide field steps for G-IMP: High grid impedance
Product fit · Unknown
Safe checks now
Record the alarm, time and whether the premises supply appears normal. Do not change the grid standard or protection settings; contact the installer if the alarm repeats.
Installer remedy
Check the measured grid condition, AC connection and selected standard using the Solis alarm-list procedure. Preserve approved settings and obtain network approval before any protection-point change.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
DC-INTF / OV-DCA-I
DC input over-current
The inverter detected excessive current at a DC input or MPPT.
Product fit · Unknown
Show field stepsHide field steps for DC-INTF / OV-DCA-I: DC input over-current
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
IGFOL-F
Grid-current tracking failed
The inverter could not correctly track the grid current.
Product fit · Unknown
Show field stepsHide field steps for IGFOL-F: Grid-current tracking failed
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
IG-AD
Grid-current sampling failed
The inverter detected a fault in its grid-current sampling circuit.
Product fit · Unknown
Show field stepsHide field steps for IG-AD: Grid-current sampling failed
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
OV-TEM
Over temperature
The inverter temperature exceeded its permitted operating range.
Product fit · Unknown
Show field stepsHide field steps for OV-TEM: Over temperature
Product fit · Unknown
Safe checks now
From a safe position, keep the area around the inverter clear and note direct sun, unusual heat or visibly blocked airflow. Do not open the unit; contact the installer if it remains.
Installer remedy
Check ambient conditions, installation clearances and cooling against the exact Solis model instructions. If conditions are normal and the alarm persists, follow the manufacturer escalation path.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
INI-FAULT
Initialisation system fault
The inverter detected a system fault during initialisation.
Product fit · Unknown
Show field stepsHide field steps for INI-FAULT: Initialisation system fault
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
DSP-B-FAULT
Main–slave DSP communication failure
Communication between the inverter's internal control processors failed.
Product fit · Unknown
Show field stepsHide field steps for DSP-B-FAULT: Main–slave DSP communication failure
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
12power-FAULT
12 V power-supply fault
The inverter detected a fault in its internal 12 V supply.
Product fit · Unknown
Show field stepsHide field steps for 12power-FAULT: 12 V power-supply fault
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
PV ISO-PRO01/02
PV insulation protection
The inverter measured low insulation resistance between the PV circuit and earth.
Product fit · Unknown
Show field stepsHide field steps for PV ISO-PRO01/02: PV insulation protection
Product fit · Unknown
Safe checks now
Record the exact alarm and weather conditions, keep clear of the array and do not reset the inverter or operate DC equipment. Arrange a licensed inspection promptly.
Installer remedy
Follow the Solis alarm-list checks for polarity, PV voltage, insulation, leakage or arcing under the exact model's safe-isolation procedure. Rectify the cause before returning the system to service.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
ILeak-PRO01–04
Leakage-current protection
The measured residual current exceeded the protection limit.
Product fit · Unknown
Show field stepsHide field steps for ILeak-PRO01–04: Leakage-current protection
Product fit · Unknown
Safe checks now
Record the exact alarm and weather conditions, keep clear of the array and do not reset the inverter or operate DC equipment. Arrange a licensed inspection promptly.
Installer remedy
Follow the Solis alarm-list checks for polarity, PV voltage, insulation, leakage or arcing under the exact model's safe-isolation procedure. Rectify the cause before returning the system to service.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
RelayChk-FAIL
Relay check failed
The inverter's internal relay self-check did not pass.
Product fit · Unknown
Show field stepsHide field steps for RelayChk-FAIL: Relay check failed
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
DCinj-FAULT
High DC injection current
The measured DC component of the AC output exceeded its protection limit.
Product fit · Unknown
Show field stepsHide field steps for DCinj-FAULT: High DC injection current
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
Screen off
Screen off with DC present
The display is off even though the PV circuit may still be energised; the inverter may have an internal fault.
Product fit · Unknown
Show field stepsHide field steps for Screen off: Screen off with DC present
Product fit · Unknown
Safe checks now
Record the exact alarm, model and time. Do not repeatedly restart the inverter, operate isolators or open equipment; contact the installer if the alarm does not clear.
Installer remedy
Use the current Solis alarm-list procedure for the exact message, including one controlled restart only where documented. Escalate a persistent internal sensing, bus, relay or current fault to Solis.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
AFCI self-test
AFCI self-detection fault
The arc-fault detection module did not pass its self-check.
Product fit · Unknown
Show field stepsHide field steps for AFCI self-test: AFCI self-detection fault
Product fit · Unknown
Safe checks now
Record the exact alarm and weather conditions, keep clear of the array and do not reset the inverter or operate DC equipment. Arrange a licensed inspection promptly.
Installer remedy
Follow the Solis alarm-list checks for polarity, PV voltage, insulation, leakage or arcing under the exact model's safe-isolation procedure. Rectify the cause before returning the system to service.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff
Arcing
Arc detected in DC circuit
The inverter's arc-fault protection detected a possible DC arc.
Product fit · Unknown
Show field stepsHide field steps for Arcing: Arc detected in DC circuit
Product fit · Unknown
Safe checks now
Record the exact alarm and weather conditions, keep clear of the array and do not reset the inverter or operate DC equipment. Arrange a licensed inspection promptly.
Installer remedy
Follow the Solis alarm-list checks for polarity, PV voltage, insulation, leakage or arcing under the exact model's safe-isolation procedure. Rectify the cause before returning the system to service.
Remedy sourceSolis alarm list (NA)
Manufacturer / escalation handoff

Sources

ManufacturerSolis Inverter Alarm Codes — Complete List, North America service centre
ManufacturerSolis service guide: inverter will not turn on

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Good to know

Frequently asked

Where do these Solis fault codes come from?: Compiled from publicly available Solis inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with Solis.
Which of these can I clear on site?: Some clear on their own once grid or environmental conditions return to normal. Anything involving DC isolation, AC switching, wiring or opening the unit is licensed electrical work. Isolate safely, follow AS/NZS 5033 and AS/NZS 3000 procedure and use appropriate PPE before touching a live system.
The exact code isn't listed. Why not?: Firmware and model variants differ, and manufacturers revise their code tables. We document the most common ones; for a variant that isn't here, check the unit's current manual or the manufacturer's service portal.
How current is this reference?: This reference was last reviewed on 2 August 2026. We revise entries when the underlying manufacturer documentation changes.

Keep exploring

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No display / inverter will not turn on

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Over grid voltage

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Under grid voltage

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Over grid frequency

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AC polarity incorrect

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No grid detected

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Over DC voltage

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Over DC bus voltage

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Under DC bus voltage

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Grid interference

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Over grid current

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Over IGBT current

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High grid impedance

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DC input over-current

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Grid-current tracking failed

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Grid-current sampling failed

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Over temperature

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Initialisation system fault

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Main–slave DSP communication failure

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12 V power-supply fault

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PV insulation protection

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Leakage-current protection

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Relay check failed

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High DC injection current

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