SunPower-branded systems use either SunPower’s own inverter hardware or OEM units depending on install year. Error codes display on the inverter unit or through the SunPower monitoring app, when it’s still accessible.

Common SunPower Error Codes

Arc Fault Detected: A safety-critical fault, not a routine performance issue. See our guide on arc fault errors for what this means and why it should be treated urgently.

Ground Fault: Indicates reduced DC-side insulation resistance — often from moisture intrusion or aging wiring at the panel or conduit level.

Grid Fault / Voltage Fault: The inverter has detected out-of-range grid conditions. Infrequent occurrences are typically transient.

Communication Fault / Monitoring Offline: Especially common now — many SunPower monitoring portals have become unreliable or inaccessible following the company’s bankruptcy, even when the inverter itself is functioning normally.

No Display, No Output: A hard inverter failure requiring on-site diagnosis and likely replacement.

What SunPower’s Bankruptcy Means for Your Service Options

SunPower filed for bankruptcy in 2024, which has significantly disrupted manufacturer-based warranty support, monitoring platform reliability, and parts availability for existing systems. If you own a SunPower system, this changes how a failure should be handled:

  • Manufacturer warranty claims are difficult or impossible to process through normal channels
  • Monitoring outages don’t necessarily mean your system has stopped producing — verification by a technician is the only reliable way to know
  • Third-party licensed technicians can still diagnose, repair, and replace SunPower equipment

For a full breakdown of your options, see our dedicated page: SunPower Bankruptcy Help

Related Reading

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Sources & Further Reading