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Red and Yellow LEDs are on

Red and Yellow LEDs are on — Ground fault in PV system

SMA · Sunny Boy Inverters

What does Red and Yellow LEDs are on mean?

Both the Red and Yellow LEDs are illuminated, indicating that the inverter has detected a ground fault in the PV system and has disconnected from the grid. The inverter will not restart automatically until the ground fault is located and fixed.

Common Causes

  • Ground fault in the PV system.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Contact your installer immediately to report the ground fault.

  2. 2

    Your installer must locate and fix the ground fault in the PV system before the inverter can resume normal operation.

  3. 3

    Refer to the inverter installation guide for information on solving PV array ground faults, which your installer will use.

Browse all codes in this manual (70)
Verified technical data. Last updated: April 2026

Related Faults

!PV-Overvoltage!!PV-Overvoltage! !DISCONNECT DC! — Overvoltage at DC input10251Event 10251 — Communication status to network switch or DHCP server changed10252Event 10252 — Communication disrupted
Source: SMA Sunny Boy Inverters
Open Manual (Page 16)Search more codes in this manual