Event 3401, 3402, 3407 and rapid flashing LEDs — DC overvoltage detected

What does 3401, 3402, 3407 mean?

The inverter has detected overvoltage at its DC input, which is additionally signaled by rapidly flashing LEDs. This is a critical error as sustained overvoltage can permanently damage the inverter, requiring immediate attention.

• DC voltage from the PV array exceeds the maximum input voltage of the inverter.
• PV array incorrectly rated or wired for the inverter.

Click steps to track your progress.

1. 1

   Disconnect the inverter from all voltage sources IMMEDIATELY (refer to your installation manual for safe disconnection procedure).

2. 2

   After disconnection, check if the DC voltage is below the maximum input voltage of the inverter.

3. 3

   If the DC voltage is below the maximum, reconnect the terminal block with the DC conductors to the inverter.

4. 4

   If the DC voltage exceeds the maximum input voltage, ensure the PV array has been correctly rated or contact your PV array installer.

5. 5

   If this message repeats frequently, contact SMA Service for further assistance.