Watchdog Error

What does F67 mean?

This Manual Fault signals a critical internal software or hardware malfunction detected by the watchdog timer. This error requires specialized attention to resolve.

• Software infinite loop or hang in the main control program, preventing the watchdog timer from being reset.
• Critical hardware failure on the control board (e.g., CPU, memory, clock oscillator) preventing normal program execution.
• Severe electromagnetic interference (EMI) causing processor lockout or memory corruption.
• Power supply instability to the control board's digital circuits (e.g., 3.3V or 5V rail drop).
• Firmware bug causing an unhandled exception or stack overflow condition.

Click steps to track your progress.

1. 1

   1. Perform a hard power cycle of the inverter by completely disconnecting AC and DC power sources for at least 5 minutes before re-applying.

2. 2

   2. Monitor input AC and DC voltages for stability using a power quality analyzer to rule out external power supply issues affecting the control board.

3. 3

   3. Update the inverter's firmware to the latest available version, as this often includes patches for software bugs and stability improvements.

4. 4

   4. Check the device's internal event log (if accessible) for any preceding errors or diagnostic messages that might indicate the root cause.

5. 5

   5. If the error persists after a hard reset and firmware update, prepare to replace the main control board as it indicates a likely hardware failure.