To reset the EC (Error Code) on a Sub-Zero 611 refrigerator, follow these steps:
1. Locate the control panel on the refrigerator. It is usually on the top inside the fridge section or on the front grille.
2. Press and hold the "Alarm" and "Ice" buttons simultaneously for about 5-10 seconds.
3. Keep holding the buttons until you hear a beep or see the EC error code disappear from the display.
4. Release the buttons after the reset is complete.
5. The refrigerator should now be reset, and the EC error code should be cleared.
If the EC error code persists or if you encounter other issues, consult the refrigerator's user manual or contact Sub-Zero customer support for further assistance and troubleshooting.