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Also know, how do I reset my LG microwave?
Press and hold the START/ENTER key again for approximately 4 seconds. The L indicator or lock icon should disappear from the display. If the controls are still not responding, attempt a reset on the microwave by unplugging the unit for 2-3 minutes. Plug the microwave back in and attempt the use the microwave again.
Keeping this in view, why does stove say f3?
The F3 error code indicates a problem with the oven temperature sensor, the electronic oven control (EOC), or the wiring in between. To test the range someone needs to access the rear of the EOC. The 2 violet wires go from the EOC to the oven temperature sensor. The sensor has been replaced.
Turn on the heat to the oven; if the F3 error code returns, turn off the electricity to the oven again or turn off the gas supply by closing the gas cock at the oven's gas supply tube.