Enphase systems don’t use a single string inverter – each panel has its own microinverter, so a fault typically affects one panel rather than the whole system. Status shows up in the Enlighten monitoring app or on the IQ Gateway (formerly called Envoy), not on the microinverter itself, since microinverters mount behind the panel with no display.
Common Enphase Fault Conditions
| Display Message / Condition | What It Means | Severity |
|---|---|---|
| Microinverter Not Reporting / Offline | One or more microinverters aren’t communicating with the IQ Gateway – often a networking issue, but can also indicate a failed unit. | Low-Moderate |
| IQ Gateway Offline / No Communication with Enlighten | The system may still be producing normally, but you’ve lost visibility into it – a monitoring blind spot, not necessarily a production problem. | Moderate |
| Ground Fault Detected (IQ Gateway / IQ Combiner) | System-level ground fault protection has detected reduced isolation somewhere in the array wiring. | Safety hazard |
| Arc Fault Detected (AFCI, IQ Combiner / Gateway) | System-level arc-fault circuit interrupter detected a potential arc condition. | Safety hazard |
| Q Relay or Trunk Cable Fault | Issue at the panel-to-panel connection point rather than inside a microinverter itself – often physical damage or a connector issue. | Moderate |
| Overtemperature / Derate | Microinverter has temporarily reduced output to protect itself from heat, common in units mounted with poor airflow. | Low |
This covers the fault categories homeowners encounter most often. Exact terminology and where a fault is detected (per-microinverter vs. at the IQ Gateway or IQ Combiner) varies across IQ6, IQ7, and IQ8 generations – if Enlighten is showing something not listed here, note it exactly and a technician can look it up for your specific hardware.
Ground Fault and Arc Fault: Why These Codes Are Different
Most fault conditions affect performance – annoying, but not dangerous. Ground fault and arc fault detections are different. Both are safety protections built into the system specifically to catch conditions that can cause electric shock or start a fire, and both deserve a faster response than a typical offline microinverter.
A ground fault means current is leaking outside its intended path, most often through damaged wire insulation, water intrusion, or a compromised connector somewhere in the array. An arc fault means the system’s AFCI protection detected current jumping across a gap instead of flowing through an intact conductor – arc-fault protection has been required on residential PV systems since 2011 under NFPA 70, Article 690.11.
Clearing either condition and letting the system restart production does not fix anything – it only clears the fault flag. If the underlying wiring damage, moisture intrusion, or failed connector is still there, the condition can recur, sometimes without being safely detected and interrupted the next time. Repeatedly clearing a system that keeps flagging a ground fault or arc fault, instead of having it inspected, is how a manageable wiring issue turns into a safety event. If Enlighten shows either of these conditions, treat it as a signal to schedule a diagnostic inspection – not a nuisance to dismiss.
Repair or Replace?
Enphase microinverters carry an industry-leading 25-year warranty, and because each one operates independently, a single failed unit typically only means replacing that one microinverter – not the whole system. The panel it’s attached to will show zero or reduced production until it’s swapped, but the rest of the array keeps producing normally. IQ Gateway and IQ Combiner hardware carry shorter warranty terms and are evaluated separately if they’re the source of a fault.
Important Safety and Liability Notice
This article is provided for general informational purposes only and does not replace a professional, on-site diagnosis. Solar electrical equipment operates at hazardous voltages and involves real fire and shock hazards; do not open, probe, or attempt to repair internal microinverter, IQ Gateway, or IQ Combiner components yourself. ElectriCare, Inc. makes no warranty as to the completeness or current accuracy of manufacturer fault terminology referenced here, which varies by hardware generation and firmware version, and assumes no liability for property damage, injury, or system damage resulting from actions taken based on this content. If your system displays a ground fault, arc fault, or any condition you’re unsure about, do not repeatedly clear it without inspection – contact a licensed technician for evaluation.
Related Reading
- Inverter Errors and Failures: Complete Troubleshooting Guide
- Solar Arc Fault Errors: Causes, Risks and What to Do
- Help for Orphaned Solar Systems
Get Your Enphase System Diagnosed
ElectriCare diagnoses and services Enphase microinverter systems, including single-unit replacement, IQ Gateway and IQ Combiner troubleshooting, and monitoring reconnection. Ground fault and arc fault calls are treated as priority service.
Schedule Enphase Inverter Service →
Sources and Further Reading
- Enphase Official Support
- NFPA 70, Article 690 – Solar Photovoltaic Systems
- CALSSA – California Solar and Storage Association