Bridge element failure

This step-by-step repair guide walks you through fixing bridge element failure on your LG LSIS3018SS (Induction Range). With the right tools and parts, most homeowners can complete this repair in 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.

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Common Symptoms & Causes

The following symptoms typically point to bridge element failure on the LG LSIS3018SS induction range.

The bridge cooking zone fails to activate when selected on the control panel
Only one half of the bridge element heats while the other remains completely cold
The display shows an error code such as “E6” or “F6” when the bridge function is enabled
Pots placed across the bridge zone heat unevenly or not at all despite correct cookware being used

These issues are most commonly caused by a failed bridge relay on the main power control board, a damaged induction coil, or deteriorated wiring connections between the control board and the bridge heating element.

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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

Step-by-Step Repair Instructions

Step 1

The LG LSIS3018SS bridge element combines two induction zones into a single large cooking area for oversized cookware. To confirm the bridge circuit is the problem and not the individual zones, place a large induction-compatible pot that spans both zones, then activate bridge mode — if the pot heats in single-zone mode but not bridge mode, you have isolated the fault to the bridge circuit specifically. Pro tip: use a ferrous pan and confirm it triggers the individual zones first, so you can rule out a pan-detection issue before disassembling anything.

Step 2

If both individual zones function correctly but bridge mode fails to activate or heat, the bridge drive circuit on the control board has failed. On this model, the bridge function is handled by dedicated components on the main control board rather than a separate module, so the board itself is the faulty part. This distinction matters because it tells you exactly what to order before you open the unit.

Step 3

Before accessing the control board, unplug the range and wait at least 5 minutes to allow capacitors on the induction board to discharge — touching a live induction board can cause a serious electrical shock even after power is cut. Remove the rear panel by extracting the four ¼-inch hex screws, then locate the control board and visually inspect the IGBT transistors in the bridge zone area for burn marks, carbon scoring, or a cracked component body. A failed IGBT will often show visible heat damage, confirming the board is the source of the fault.

Step 4

Because the bridge zone IGBT drivers are soldered directly onto the control board and are not sold or serviced separately, the entire control board must be replaced as a unit. Order the replacement board using your full model and serial number to ensure you receive the correct revision, as board layouts can vary between production runs. Do not attempt to reflow or replace individual IGBTs unless you have professional SMD rework equipment, as an improperly repaired induction board is a fire and shock hazard.

Step 5

Before reinstalling, carefully reconnect every wiring harness to its original connector on the new board — mismatched harnesses can cause zone errors or damage the replacement board immediately on power-up. Pro tip: photograph all harness positions before disconnecting anything during disassembly so you have a reference during reassembly. Once all connectors are seated and the rear panel is secured with its four ¼-inch hex screws, restore power to the unit.

Step 6

Test bridge mode by placing a large flat-bottom induction-compatible pan that fully spans both zones, then activating the bridge function and setting a heat level. The bridge zone should activate within a few seconds and heat the pan evenly across its full surface with no error codes displayed. Uneven heating concentrated on only one side of the pan would indicate a harness connection issue and should be investigated before returning the range to regular use.

Where to Buy Replacement Parts

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

When to Call a Professional

If the issue persists after completing all steps above, the problem may involve the sealed refrigerant system, a failed main control board, or wiring that requires specialized diagnostic equipment. Contact a licensed appliance technician — attempting sealed-system repairs without EPA 608 certification is illegal and unsafe.

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How Much Does This Repair Cost?

Replacing a bridge element on the LG LSIS3018SS yourself typically costs between $40–$120 for the replacement induction coil or control board components. A professional repair, including the service call and labor, usually runs $150–$300 or more. Tackling this repair yourself can save you $100–$200 while restoring full bridge cooking functionality.

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Frequently Asked Questions

How do I know if the bridge element on my LG LSIS3018SS has actually failed?

The most common signs are that the bridge zone won’t activate when you place a large pan across both cooking areas, or you see an error code on the display. Try power cycling the range first to rule out a temporary glitch.

Is it safe to keep using the range while the bridge element is failing?

You can typically use the individual cooking zones safely, but avoid attempting to activate the bridge function until the repair is complete to prevent further electrical damage.

Do I need a professional technician to replace the bridge element, or can I do it myself?

This repair involves high-voltage induction components and should only be attempted by someone with appliance repair experience. If you’re unsure, hiring a certified LG technician is strongly recommended.

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