How to troubleshoot the F1 error on an LG induction cooktop

If you’re seeing the F1 error on your LG induction cooktop, it usually means there’s a problem with the left burner temperature sensor. But don’t worry – you can troubleshoot this error code yourself without spending on an expensive service call.

Let’s walk through the steps together so you can clear the F1 error for good.

If you find out that you need any replacement parts for your LG cooktop 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.

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.

What causes the F1 error message?

The F1 error code on LG cooktops usually signals a specific issue with the left front burner temperature sensor. This sensor reads the temperature when the burner is turned on and heating and communicates this information to the generator control board.

When the cooktop detects a problem with this sensor, it throws the F1 error to alert the user that a repair is needed. Some potential causes include:

A faulty sensor

This is the most common cause of the F1 error. Over time, sensors may degrade or fail, which can lead to inaccurate temperature readings.

A voltage problem at the left generator board

If there’s not enough voltage getting to the sensor from the generator board, then there could be a problem on the control board or an issue with the wiring from the board to the sensor.

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

How to troubleshoot the F1 error code

Follow these steps to resolve the F1 fault code on your LG induction cooktop.

Step 1: Test the temperature sensor for the left burner

1. Unplug the cooktop from the outlet.
2. Remove the rear panel, control panel and screws holding the cooktop.
3. Find the sensor on the left burner coil.
4. Set a multimeter to measure resistance (Ω).
5. Place the multimeter probes on the sensor terminals.
6. Check the meter reading. At room temperature, the resistance should be around 500-550KΩ. Any reading that’s significantly different from this value indicates a problem with the sensor, which would need to be replaced.

If the sensor tests within the expected resistance range, move on to the next step.

Step 2: Check the wiring at the control board

1. Check the wiring at the control board. Look for any loose connections or damage such as burn marks or frayed wires. Reseat any loose wires. If you see any damage, replace the wiring.
2. If the wiring looks OK, set a multimeter to check it for continuity.
3. Use the meter probes to check the wiring. The meter should read closed and make a beeping sound to show continuity.

If there isn’t any damage to the wiring and it tests OK, replace the control board as a last resort.

Read more: Fall Appliance Checklist: Prepare for Winter

Additional information

Thank you for reading! We hope this guide helped you get your LG cooktop 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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