Why your gas LG range is displaying an F1 error code & how you can fix it

If you’re seeing an F1 fault code on your gas LG range, don’t throw it out! This is a simple issue that you can fix with some DIY troubleshooting.

If you find out that you need any replacement parts for your LG range while you’re troubleshooting, 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.

Important: The error code information provided in this article may not apply to your specific appliance model. The disassembly information is based on models starting with LRG309. 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.

What does the F1 error code mean?

An F1 error on a gas LG range usually indicates an issue with the oven temperature sensor. This sensor monitors the temperature inside the oven cavity and provides that data to the main control board. A faulty temperature sensor interrupts this process and causes the range to throw an F1 error.

What you need

• Phillips screwdriver
• Multimeter

Important: The specific tools required may vary depending on the model of your appliance and the type of fasteners used on it. Always consult the user manual or refer to any specific instructions provided by the manufacturer for the recommended tools for your appliance model.

Read more: Gas Range Smells Like Gas: Top 5 Reasons and Fixes   

Safety precautions

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 you attempt any maintenance or replacement work. This keeps you safe by eliminating any risk of electric shock.
• If the appliance has recently been used, give it plenty of time to cool down before working on it.
• Shut off the gas supply to prevent any leaks while you work.
• 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 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.
• Always take photos or make a note of wiring terminals or other connections before disconnecting them to make reassembly easier.
• Don’t test live voltage with a multimeter if you’re unfamiliar with how to prevent short-circuiting.

Read more: Gas Range Not Heating Evenly: Top 4 Reasons and Fixes

How to troubleshoot an F1 error code

Clear the F1 fault code from your LG gas range by following these easy steps.

Step 1: Access the main control board

1. Unplug the range from the power outlet.
2. Shut off the gas supply to the range.
3. Pull the range away from the wall to access the rear panel.
4. Remove the two wire covers by taking out the screws.
5. Remove the 3 screws from the rear control cover and take off the cover.
6. Remove the 16 screws from the rear back cover and take off the cover.
7. Check for a loose wiring connection or damaged wiring harness.

Reseat any loose connections. Replace the wiring harness if it’s damaged.

Step 2: Test the oven temperature sensor

1. Find the CN05 wiring connector on the main control board.
2. Set a multimeter to resistance mode (Ω).
3. Use the multimeter probes to measure the resistance between pins 1 and 2 of the CN05 connector on the control board.
4. Check the meter reading. The resistance should be approximately 1.09kΩ at 77°F.

NOTE: Generally, for every 1 degree in temperature difference, 2 Ohms could be added or subtracted. If the temperature in your home is cooler, resistance would be subtracted. 

If the resistance isn’t within the normal range, then the oven sensor needs to be replaced.

If the resistance is within the normal range, then the control board needs to be replaced.

How to replace the oven temperature sensor (if necessary)

1. Make sure the range is disconnected from the power supply.
2. Make sure the gas supply to the range is shut off.
3. Open the oven door and remove the racks.
4. Find the oven sensor on the back wall of the oven interior.
5. Remove the 2 mounting screws holding the sensor.
6. Disconnect the sensor by pulling the wire towards the oven cavity.
7. Install the new oven sensor by reattaching the wiring harness and mounting screws.

Read more: 6 tips to safely cook with a gas range  

More for you

Thank you for reading! We hope this guide helped you get your gas LG range working again.

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.

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