Display shows dO; door alarm sounds frequently even when doors appear closed.

Safety first: Unplug the refrigerator before removing door switch components.

Steps to address dO:

• 1. Check door alignment: Ensure the door closes squarely and fully. Adjust leveling legs so the refrigerator leans slightly back to help doors close.
• 2. Inspect door switch: Locate the door switch (usually in the top or side liner). Press it by hand; the interior light should turn off. If not, the switch may be faulty.
• 3. Test continuity: Remove the switch by gently prying it out, disconnect the wires, and test with a multimeter. The switch should show continuity when pressed and open when released.
• 4. Replace defective switch: Install a new door switch, reconnect wires, and snap it back into place.
• 5. Check wiring and board: If the switch tests good but the alarm persists, inspect wiring back to the control board. A failed input on the main control board may require board replacement.