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3501, 3601, or 3701

Event 3501, 3601, or 3701 with red LED glowing — Ground fault detected in PV system

SMA · Sunny Boy Inverters

What does 3501, 3601, or 3701 mean?

The red LED is glowing and one of these event numbers is displayed, indicating a ground fault in your PV system. This means the electrical insulation from the PV system to ground is defective or insufficient.

Common Causes

  • Damage to PV array cables or insulation
  • Moisture or debris compromising insulation
  • Faulty PV module or string

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Immediately turn off the DC load-break switch on the inverter.

  2. 2

    Do not touch any parts of the PV array substructure or frame.

  3. 3

    Only touch PV array cables on their insulation.

  4. 4

    Contact a qualified installer or SMA Service to diagnose and repair the ground fault safely.

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 80)Search more codes in this manual