How to Fix LG Microwave Error F3

Error Code: F3 Difficulty: Moderate

Problem: There is a control panel malfunction or a key error. It can also indicate a temperature sensor error.

How to Fix F3 Error (Step-by-Step)

1. Unplug the microwave from the wall outlet to ensure your safety.
2. Open the microwave door and look for screws along the frame that hold the control panel assembly in place.
3. After removing the screws, gently pry the control panel assembly away from the microwave body.
4. Be careful not to pull too hard, as it is connected by a delicate ribbon cable to the main board.
5. Release the clip on the connector and detach the ribbon cable from the old keypad controller.
6. Replace the old keypad assembly with the new one (part ACM74119046 or ACM74119039).
7. Reconnect the ribbon cable, snap the control panel back into position, replace the screws, and test functionality.
8. Turn the appliance off, wait about 2 minutes, then turn it back on.

Next Steps and Parts

Still Not Working?
If the replacement part didn’t fix the issue, you may have a wiring problem or main board failure.