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Red LED glowing

Red LED glowing — Event occurred

SMA · SUNNY BOY Solar Inverters

What does Red LED glowing mean?

A red LED glowing steadily indicates that an event or error has occurred with the inverter. More details about the event, including type, number, date, and time, will be shown on the inverter's display.

Common Causes

  • Internal fault in the inverter.
  • External fault with the PV system or grid.
  • Configuration error.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the inverter's display immediately for the specific event type and number.

  2. 2

    Consult the troubleshooting section of the manual using the event number for detailed corrective measures.

  3. 3

    If the display shows 'Error', refer to the manual's troubleshooting section or contact a qualified installer/service technician.

Browse all codes in this manual (31)
Verified technical data. Last updated: April 2026

Related Faults

1501Event 1501 — Reconnection fault, grid data mismatch301Event 301 — Grid fault, voltage out of range3301, 3303Event 3301 or 3303 — Unstable operation, insufficient DC power
Source: SMA SUNNY BOY Solar Inverters
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