On the gas supply pipe to your oven, there will be a small valve that controls the gas. Make sure the handle lines up with the pipe (on), and is not turned so it is 90 degrees to the pipe (off). If this doesn't solve the problem, make sure you turn this gas OFF before proceeding to the rest of these troubleshooting steps.. On LG gas oven models, the F9 code means that the oven was unable to exceed 150°F degrees after the initial 5-minute preheating sequence. On LG electric ovens, the F9 code could signal issues with components like the temperature sensor, relay control board, thermostat, or damaged heating elements - all causing irregular heat patterns.

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If you have an electric oven, the relay board is usually located behind the range at the bottom right of the oven. If you have a gas oven, the relay board is usually located behind the range, at the top right. You will need to pull the oven out to access and remove the rear panel. Follow these steps to access and replace the relay board:. The oven control PCB is defective. Wiring issue between the oven temperature sensor and the control PCB. One of the oven elements open.