Embedded Systems Error Code
Systems & Devices
Embedded Systems

WATCHDOG RESET | Watchdog triggered

Industry
Systems & Devices
Canonical
/systems/embedded-systems/error-codes/watchdog-reset/
Last Updated
Feb 27, 2026
Summary

The system rebooted because the watchdog timer was not serviced in time.

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What This Code Means

A “watchdog reset” indicates the watchdog timer expired, forcing a reboot because the system did not complete a required heartbeat/loop in time. It can be caused by deadlocks, long blocking operations, or timing regressions.

Where Users Usually See This Code

  • Device status screens or logs
  • During startup or initialization sequences
  • While interacting with sensors, buses, or storage
  • After firmware updates or configuration changes

Why This Code Appears

  • A safety check or assertion failed
  • The system restarted due to watchdog or power conditions
  • A bus, peripheral, or storage operation failed
  • A resource limit was reached (memory/stack)

What Typically Happens Next

  • The device may reboot or enter a fault state
  • A diagnostic message is logged
  • Service intervention may be required for field equipment

What This Code Is Not

  • It is not always user-repairable
  • It is not safe to perform electrical repairs based on guesses

Troubleshooting Checklist

  • Capture the full log output, including any stack trace or code
  • Confirm firmware version and recent configuration changes
  • Check power stability and environmental conditions
  • Isolate peripherals and buses if the fault indicates I/O
  • Use vendor diagnostics and service manuals for the exact model
  • Escalate when the fault is recurring or safety-critical

Notes And Edge Cases

Embedded error identifiers are frequently product-specific; the exact device documentation is critical.

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