How to Fix Error F9 — cooling fault on LG LSIS3018SS (Induction Range)

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Error F9 — cooling fault

In this post, I’ll walk you through the steps to fix the error F9 — cooling fault on your LG LSIS3018SS (Induction Range). With the right tools and parts, you can complete this repair in about 1–2 hours and avoid a costly service call.

Part of our Top 20 Oven Models & Common Repair Issues Guide. Browse all oven repair guides for related models and issues.

Common Symptoms & Causes

If your LG LSIS3018SS induction range is showing a cooling fault, you may experience one or more of the following symptoms:

• The control panel displays the “F9” error code during or after cooking
• The range shuts off unexpectedly and will not resume operation
• The cooling fan beneath the cooktop runs loudly, erratically, or not at all
• The unit feels excessively hot to the touch around the control board area

Typically, this error arises from a failed or obstructed cooling fan, a faulty fan motor, or a defective control board that can no longer manage internal temperatures effectively.

Safety First

• Unplug the oven from the power outlet before starting any repair — never work on a live appliance.
• Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
• Take photos with your phone before disconnecting any wiring harnesses or connectors.
• Work in a well-lit area with enough floor space to lay removed panels flat.

Tools & Parts Needed

Essential Tools

• Phillips #2 screwdriver
• ¼” nut driver
• Multimeter
• Work gloves (heat-rated)
• Flashlight

Replacement Parts

• Cooling fan motor
• AUGREX EAU61865302 Range Convection Fan Motor Fit for LG
• multimeter

Step-by-Step Repair Instructions

Step 1

First and foremost, unplug the range from the wall outlet. The F9 error means the control board has detected an overheating condition. Working on a live unit poses a risk of electric shock. Allow the appliance to cool for at least 30 minutes, so the internal components return to a safe temperature. While you wait, take a look at the rear vent openings and clear any accumulated lint or debris, as blocked vents are often the most common trigger for this fault.

Step 2

Next, remove the rear access panel by taking out the four quarter-inch hex screws. Then, locate the cooling fan assembly. Spin the fan blade by hand—it should rotate freely with no grinding or stiff resistance. If it feels seized or drags, the fan motor bearings have likely failed, and you’ll need to replace the motor. A seized fan cannot move air across the induction board, leading to rising temperatures and triggering the F9 fault.

Step 3

Using your multimeter, set it to the Rx1 (resistance times 1) scale and probe the fan motor terminals to test for continuity. An open reading—where the meter shows no continuity—indicates the motor winding has burned out, confirming that the motor requires replacement. A pro tip: also inspect the fan wiring harness connector for heat-melted pins or corrosion before concluding that the motor itself is at fault.

Step 4

Next, locate the thermal fuse mounted in the main induction control board area. Test it on the Rx1 scale with the multimeter. No continuity indicates the fuse has blown. This fuse is a one-shot protective device that sacrifices itself when temperatures exceed a safe limit, and it won’t reset. Replace the thermal fuse with an exact-rated replacement, as using a higher-rated fuse compromises important safety features.

Step 5

With the unit still unplugged, measure the gap between the back of the range and the wall. LG specifies a minimum of two inches of clearance for proper airflow. If the rear clearance is restricted, the cooling fan may not receive enough intake air, causing board temperatures to rise, even if the fan itself is functioning correctly. If necessary, reposition the unit and avoid pushing it flush against the wall after reinstalling the access panel.

Step 6

Finally, plug the range back in, select a full-size induction zone, and run it at the highest power setting for 30 minutes to replicate the conditions that initially triggered the F9 error. If the error doesn’t reappear, you’ve confirmed the repair. If F9 returns, the induction control board may have sustained heat damage and should be assessed for replacement. Keep an eye on the area around the unit during this test—any burning smell indicates a deeper electrical issue, and you should unplug the range immediately.

Where to Buy Replacement Parts

You can find genuine OEM and aftermarket replacement parts for your LG LSIS3018SS (Induction Range) on Amazon:

• LG LSIS3018SS induction range cooling fan EAU62591201 replacement
• AUGREX EAU61865302 Range Convection Fan Motor Fit for LG
• LG induction range thermal fuse 6931EL3001A

When to Call a Professional

If the issue persists after following all the steps above, the problem might involve a faulty main control board, a defective temperature sensor, or wiring that requires specialized diagnostic tools. At this point, it’s best to contact a licensed appliance technician. On gas models, do not attempt repairs on the gas valve, burner orifices, or supply line—only a licensed gas fitter should handle this work in most jurisdictions.

How Much Does This Repair Cost?

DIY repairs for an F9 cooling fault usually run between $20–$80, which covers a replacement cooling fan or thermal fuse for the LG LSIS3018SS. If you opt for a professional service call, it generally ranges from $150–$300 when you factor in labor and diagnostic fees. Tackling this repair yourself can save you $100 or more with just basic tools and a little patience.

Frequently Asked Questions

Can I keep using my LG LSIS3018SS while the F9 error is active?

No, you should stop using the range immediately. The F9 error indicates a cooling fault that can lead to overheating and potential damage to internal components.

What usually triggers the F9 cooling fault on this induction range?

The most common cause is a blocked or failed cooling fan. Dust accumulation around the vents may also restrict airflow and trigger this error.

Will clearing the F9 error myself void my LG warranty?

Basic troubleshooting like cleaning vents typically won’t void your warranty, but replacing internal parts yourself might. Always check your warranty terms before attempting any component-level repairs.

Recommended Products

These are the parts and tools I recommend for this repair, based on compatibility and customer reviews:

• 2026 Upgraded 6931EL3003D Dryer Thermal Fuse 6931EL3001F Dryer Thermostat L125-31C Replacement Fit for KenM0re LG Replaces dle5955w dle2050w dle2301r AP5072172 AP4440975 PS3530482 PS3530485 by Romalon

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The Cooling Fan Motor That Usually Stops the F9 Error on This Model

If you’ve ruled out a blocked vent or dust buildup underneath the range, the cooling fan motor (part number EAU62591201) is your next step—this is what fails in the majority of F9 calls I encounter on the LSIS3018SS, and replacing it can effectively stop the fault code from reappearing.

What works

• Clears the F9 error immediately after installation in most cases—no lingering fault codes or intermittent glitches.
• Mounting bracket and electrical connector are identical to the original, so there’s no adapting or rewiring needed.
• Once you access the bottom panel (four screws, takes 10 minutes), the motor swap itself is straightforward and doesn’t require any calibration or diagnostic tools afterward.

What doesn’t

• Aftermarket versions can occasionally have slightly weaker airflow, so order the exact LG OEM part or a certified replacement—generic “cooling fan motor” listings often won’t provide the same pressure curve.
• If the inverter board itself is already damaged from prolonged overheating, swapping the fan alone won’t fix the F9 fault—you’ll need a board replacement too, which can get expensive quickly.

The common mistake I see DIYers make is ordering a generic cooling fan and expecting it to work. I’ve had callbacks where the wrong motor was installed first, the fault code remained, and the customer had to reorder the actual LG EAU62591201. Save yourself the trouble and confirm the part number before placing your order.

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