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Yellow LED solid (General)

Yellow LED solid - General fault in inverter or PV system

SMA · Sunny Boy Series

What does Yellow LED solid (General) mean?

A continuously lit yellow LED indicates that the SMA Sunny Boy has detected a general fault either within its internal systems or somewhere in the connected PV (photovoltaic) system. The inverter will not operate until this fault is corrected.

Common Causes

  • Internal inverter fault
  • Fault in the PV system
  • Unspecified system issue.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the LCD display for any specific error messages or codes that may provide more detail.

  2. 2

    Perform a system power cycle: turn off DC, then AC, wait a few minutes, then turn on AC, then DC.

  3. 3

    If no specific error code is found and the yellow LED remains solid after a power cycle, contact SMA America for assistance.

Browse all codes in this manual (30)
Verified technical data. Last updated: April 2026

Related Faults

Bfr-SrrBfr-Srr - Communication failure between micro-controllersDeratingDerating - Inverter reducing power due to high internal temperatureEEPROMEEPROM - Data read/write failure (non-critical)
Source: SMA Sunny Boy Series
Open Manual (Page 71)Search more codes in this manual