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Watchdog

Watchdog - Operation control triggered

SMA · Sunny Boy Series

What does Watchdog mean?

The internal watchdog timer for operation control has been triggered, indicating a potential software or system lock-up within the inverter. This is identified as a disturbance message.

Common Causes

  • Internal system malfunction
  • Software issue.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Record the exact error message displayed.

  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 the error persists after the 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 88)Search more codes in this manual