F9 error on an electric LG oven: How to fix (2024)

Wondering why the F9 error code is showing on your LG oven and disrupting your cooking?

The F9 error code usually shows up in electric LG electric ovens that aren’t heating correctly. The error code can be caused by issues like a faulty element, sensor, control board, or wiring connections.

If you need any replacement parts for your LG oven you can enter your model number at AppliancePartsPros.com to order them. Most orders arrive in just two business days, and we have thousands of free guides to show you how to install your new parts.

Disclaimer: The error code information provided in this article is based on general service manuals and may not apply to your specific appliance model. While we strive to offer helpful advice for DIY appliance repairs, variations in models and configurations can lead to differences in troubleshooting steps, error codes and part replacements. For the most accurate guidance, we strongly recommend consulting the technical sheet for your specific appliance model.

Safety tips

When working on any appliance, remember to keep safety first. Here are some tips to keep in mind:

• Always power off and unplug your appliance or switch off the circuit breaker before attempting maintenance or replacement work. This keeps you safe by preventing any risk of electric shock.
• If the appliance has recently been used, give it plenty of time to cool down before working on it.
• Take your time while working to prevent accidents and personal injuries. Rushing is the enemy of precision.
• Work in a well-lit area so you can clearly see and access appliance parts.
• Keep your workspace free of clutter and other obstacles. Keep children and pets away from the work area.
• Never work on internal parts with wet hands. Make sure the work area is completely dry.
• Check the user manual to see if there are specific installation or safety instructions related to your appliance or replacement part.
• Be gentle when handling or removing parts. Excessive force might damage the appliance or cause personal injury.
• Wear insulated work gloves to protect your hands from sharp metal parts and debris.
• When working with wires, avoid touching any exposed wires or terminals. If you need to touch a wire, use a non-conductive tool or wear insulating gloves to prevent electrical shock.
• Don’t test live voltage with a multimeter if you’re unfamiliar with how to prevent short-circuiting.
• Consider wearing safety glasses and/or a dust mask when working with chemicals, dust or a large amount of debris to prevent irritation or injury.

How to troubleshoot the F9 error code

Step 1 – Check the temperature sensor

The temperature sensor helps regulate the oven’s temperature by sending continuous feedback to the main control board. Inconsistencies in this data exchange can often lead to the F9 error code, which signals that the oven isn’t heating beyond 150°F within five minutes of preheating.

To examine the sensor:

1. Turn off the power supply to the oven and unplug it from the power supply.
2. Find the sensor, which is typically protruding from a hole at the back of the oven cavity.
3. Disconnect any attached wiring and remove the sensor.
4. Look over the sensor for any physical damage or corrosion. If you find any, replace the sensor.
5. If the sensor looks good, use a multimeter to check the sensor’s resistance (has symbol Ω). If the sensor’s resistance is out of the acceptable range (check your unit’s user manual or tech sheet for specifics), replace it.

Read more: How To Use A Multimeter To Check Appliance Parts

Step 2 – Check the elements

1. Make sure the oven is turned off and unplugged.
2. Find the bake and broil elements, which are at the bottom and top of the oven.
3. Remove the elements and inspect them for any signs of damage or wear. If you see any cracks or breaks on either one, replace them.
4. Use a multimeter to test each element for resistance (in Ohms Ω). If either element is outside of the acceptable resistance range, replace it.

Step 3 – Check the wiring connections

1. Make sure the oven is turned off and unplugged.
2. Remove any panels necessary to access the relay or main control board.
3. Carefully inspect each wire connector for any signs of damage or loose connections. If you find any damage, replace the wiring.
4. Detach and reattach each wire connector to make sure each one is secure.

Step 4 – Inspect the control and relay boards

1. Make sure the oven is turned off and unplugged.
2. Find the control board, which is usually behind the panel with the display.
3. Look over the board and see if there are any burnt areas on the printed circuit board or loose or damaged wires attached to the board. If you find any damage to the board, replace it.

Read more: Don’t Get Burned! 14 Quick and Easy Oven Safety Tips

More information

Thank you for reading! We hope this guide helped you solve the F9 error on your electric LG oven.

If you have any other appliance repair needs or projects, don’t hesitate to explore our other troubleshooting guides and videos.

If you need replacement parts or some extra help with ordering them, grab your model number and head over to AppliancePartsPros.com, where you can chat with a pro, read our DIY blog, and more. We can also help you troubleshoot common oven problems here.

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