Where do these Enphase fault codes come from?

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

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 3 August 2026. We revise entries when the underlying manufacturer documentation changes.

Inverter Fault Library

Enphase Microinverter Error Codes

Enphase IQ event reference with current official remedies separated from legacy event vocabulary retained through labelled secondary sources.

Sources listedReviewed August 2026Source: Manufacturer documentationOur methodology

Manufacturer: Enphase (IQ-series microinverters)
Codes documented: 13
Source: Manufacturer documentation
Scope: IQ-series event reference; current official remedies and legacy secondary event vocabulary kept separate

13 of 13 codes

About this fault librarySources · scope

Enphase IQ-series microinverters report plain-language events through the IQ Gateway rather than one universal numeric table. Current official Enphase material supports the reviewed remedies for IQ8 DC Resistance Low, Microinverter Failed to Report and Gateway Not Reporting. The remaining event vocabulary is retained from manufacturer-authored material available through secondary mirrors; those entries deliberately have no reviewed remedy until an official Enphase source is recovered. Australian product availability does not prove that every event label or firmware behaviour applies to every installed IQ family. Safety note: owners should stay off the roof and stop at app observations. Array, AC and DC work is for a licensed electrician and, where solar accreditation is required, an SAA-accredited person.

Key takeaways

13 Enphase (IQ-series microinverters) fault and alarm codes, documented for the trade.
Compiled from published documentation and field references; Wattbench is independent and not affiliated with Enphase (IQ-series microinverters).
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.

AC Voltage Out Of Range
Grid voltage too high or too low
The microinverter is measuring AC (grid) voltage outside the limits set by its grid profile, so it disconnects and stops exporting until the grid settles back within range. In Australia high readings are extremely common on long suburban streets at midday when lots of solar is exporting and pushing local voltage up.
AC Frequency Out Of Range
Grid frequency too high or too low
The microinverter is measuring a grid frequency outside its safe operating band (nominal 50 Hz in Australia) and goes offline as required by grid-protection rules. It must stay off until the grid has been continuously within limits for a set period; if frequency strays again during that window, the timer restarts.
Grid Gone
No grid / AC supply detected
The microinverter has disconnected from the grid/mains because it cannot detect a valid supply, so it shuts down. Enphase units are anti-islanding by design and will not produce power without a stable grid present. This appears during a blackout, or when an AC isolator, breaker or RCD on the solar circuit has been switched off.
DC Voltage Too Low
Not enough DC input from the panel
The microinverter is seeing DC input voltage from its solar module below the level needed to operate. This is completely normal early morning, late evening, in heavy shade, or on very overcast days. If it appears in good daylight, it can indicate a poor or broken DC connection between the panel and the microinverter, or, on a new system, that a grid profile still needs to be applied at commissioning before the units will produce.
DC Power Too Low
Panel producing too little power
Closely related to DC Voltage Too Low. The microinverter is measuring DC power below its operating threshold. Most often this is just low light (dawn, dusk, shade, cloud). If it occurs in full sun, it can point to a shaded, soiled or underperforming panel, or a degraded DC connection.
DC Voltage Too High
Too much DC input from the panel
The microinverter reports DC input voltage from the solar module above its rated maximum. On a correctly matched panel/microinverter pairing this is unusual and generally suggests a microinverter malfunction or a module/wiring mismatch.
GFI Tripped
Ground-fault current detected
The microinverter's built-in ground-fault (GFI) sensor has detected leakage current to earth during normal operation and has opened the circuit to protect against a fault. It can be triggered by moisture/weather, but a persistent trip points to damaged module insulation (such as cracked module glass), a damaged connector or cable, or water ingress.
DC Resistance Low - Power Off
Insulation resistance to earth too low
An insulation-resistance (IR) sensor in the microinverter measures the resistance to earth from the positive and negative DC inputs. If it drops below the acceptable threshold (around 7 kΩ on IQ units), the unit stops producing and latches off. On IQ8 units this shows as a solid red status LED (after DC power has been cycled), and the gateway keeps reporting the fault until it is cleared. Common causes are moisture ingress, damaged cabling/connectors, or degraded module insulation.
Product fit · Family-level · IQ8 Series
Show field stepsHide field steps for DC Resistance Low - Power Off: Insulation resistance to earth too low
Product fit
- IQ8 Series · Role not confirmed
  Family-level · Manual IOM-00068-3.0-EN · AU/region not confirmed · Firmware not documented
Safe checks now
Record the event, affected panel and weather conditions. Do not go onto the roof, reset the device or touch array wiring; contact the installer because the IQ8 remains power-off for this condition.
Installer remedy
Use the IQ8 manual's DC-resistance troubleshooting path to inspect the affected module and DC connection under safe isolation. Rectify the insulation condition before clearing the event or returning the unit to service.
Remedy sourceIQ8 manual
Manufacturer / escalation handoff
Over Temperature / Critical Temperature
Microinverter running too hot
An internal temperature measurement inside the microinverter is above its normal range. To protect itself it automatically reduces (derates) its power output, and in extreme cases shuts down, until it cools; full power resumes once the temperature falls to an acceptable level. Note this is an internal reading, not ambient air temperature (IQ8 units run at full power up to about 50 °C ambient and derate above that). It can be driven by very high roof temperatures or restricted airflow behind the panel.
Microinverter Failed to Report
Gateway has lost contact with a microinverter
The IQ Gateway is no longer receiving data from one or more microinverters over the powerline communication (PLC) link, so the panel shows grey (not reporting). It can be caused by powerline-communication interference (e.g. a surge strip, noise source, or the gateway being plugged into a power board rather than a wall outlet), a tripped solar breaker/isolator, an AC wiring issue, or a failed unit. It does not necessarily mean the panel has stopped producing.
Product fit · Unknown
Show field stepsHide field steps for Microinverter Failed to Report: Gateway has lost contact with a microinverter
Product fit · Unknown
Safe checks now
Check the affected panel's last-report time in the Enphase app and wait for a short-lived communication interruption to clear. If it remains beyond 24 hours, contact the installer; do not operate solar breakers.
Installer remedy
Follow Enphase's microinverter-not-reporting workflow, separating power-line communication interference from AC, wiring or device faults. Document the result before replacement or warranty escalation.
Remedy sourceCurrent troubleshooting
Manufacturer / escalation handoff
Microinverter Not Detected / Not Found
New microinverter not discovered during commissioning
During or after installation the IQ Gateway / Enphase Installer App cannot find a microinverter to add it to the system. This is a commissioning-stage condition (the device shows as "not discovered") rather than a logged operational fault, and usually means the unit isn't yet powered, hasn't been given time to be discovered, or its serial wasn't scanned correctly.
Device Produced No Power
No energy generated in the last 24 hours
A microinverter that previously produced has generated no power within the last 24 hours. Causes range across the grid (a profile/voltage/frequency condition keeping it off), the AC side (a tripped breaker or isolator), or a failed unit.
Gateway / Envoy Not Reporting
IQ Gateway not sending data to Enphase
The IQ Gateway (Envoy) itself has stopped uploading data to the Enphase cloud, so the whole system appears offline in the app. This is almost always an internet/connectivity problem (router, Wi-Fi, or the gateway's own connection) rather than a solar production fault. Your panels may still be generating normally.
Product fit · Unknown
Show field stepsHide field steps for Gateway / Envoy Not Reporting: IQ Gateway not sending data to Enphase
Product fit · Unknown
Safe checks now
Confirm the home internet is working and follow the Gateway Not Reporting steps presented in the Enphase app. This monitoring fault does not by itself prove that solar production has stopped.
Installer remedy
Confirm gateway power and its Wi-Fi or Ethernet path, then use the current Enphase gateway reconnection workflow. Escalate if the gateway remains offline after the documented connectivity checks.
Remedy sourceCurrent troubleshooting
Manufacturer / escalation handoff

Sources

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Inverter Not Producing PowerPlaybook

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Good to know

Frequently asked

Where do these Enphase fault codes come from?: Compiled from publicly available Enphase inverter and battery documentation and field references, then rewritten for the trade. Wattbench is independent and not affiliated with Enphase.
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 3 August 2026. We revise entries when the underlying manufacturer documentation changes.

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Microinverter Fault Library

Enphase Microinverter Error Codes

Grid voltage too high or too low

Grid frequency too high or too low

No grid / AC supply detected

Not enough DC input from the panel

Panel producing too little power

Too much DC input from the panel

Ground-fault current detected

Insulation resistance to earth too low

Product fit

Safe checks now

Installer remedy

Microinverter running too hot

Gateway has lost contact with a microinverter

Safe checks now

Installer remedy

New microinverter not discovered during commissioning

No energy generated in the last 24 hours

IQ Gateway not sending data to Enphase

Safe checks now

Installer remedy

Sources

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