![]() ![]() Disconnect the oven from the power source, and turn off the gas if you have a gas oven.The thermal fuse can be tested with a multimeter or visually checked for damage to see if it needs to be replaced. If the thermostat has melted, then it is also likely that the thermal fuse is defective. The thermostat causing the F9 error is usually located at the back of the oven. It is often easy to tell that the thermostat needs to be replaced because it will have melted with the high heat. The thermostat is often damaged when the oven overheats after a cleaning cycle. The thermostat is a switch that opens and closes depending on the temperature it senses. Remove and replace a faulty relay board.Īnother of the more common reasons for the F9 error is a faulty thermostat.Test the relay board with a multimeter.Release the retaining clips to detach the relay board.Remove the screws holding the board in place.Before removing, snap a picture to remember how to reconnect it. Disconnect the wiring harness from the relay board.Remove the screws holding the panel in place and lift the panel to remove it.Remove the screws holding the rear access panel brackets in place then carefully remove the brackets.If you have a gas oven, turn the gas off as well. Disconnect the oven from the power source.You will need to pull the oven out to access and remove the rear panel.įollow these steps to access and replace the relay board: If you have a gas oven, the relay board is usually located behind the range, at the top right. If you have an electric oven, the relay board is usually located behind the range at the bottom right of the oven. If the oven is turning on but not heating sufficiently and flashing an F9 error, you will need to test the relay board with a multimeter to determine if it needs to be replaced. The relay control board responds to signals from the microprocessor display control board in the control panel by opening and closing relays to control voltage going to the burners, elements, or oven. Relay BoardĪ faulty relay board is the most common cause of the F9 error. Resetting the oven by disconnecting the power for five minutes will demagnetize the circuitry and resolve the F9 error. ![]() Sometimes, the F9 error code is the result of an electrical fault that has magnetized the circuitry. There are a number of causes and solutions to the issue, which will depend on whether you have an electric or gas oven. An F9 error code on an LG oven means that the oven has failed to exceed 150 degrees Fahrenheit after five minutes of preheating. If you were planning to cook dinner in your LG oven but your LG oven is displaying an F9 error code, you will probably need to make alternative dinner plans. ![]()
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