Grate wobble

This step-by-step repair guide walks you through fixing grate wobble on your LG LRG4115ST (Gas 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 suggest your LG LRG4115ST is experiencing grate wobble on one or more burner grates.

A cast iron grate rocks noticeably when a pot or pan is placed on it
Cookware slides or shifts unexpectedly during cooking on the front-left or front-right burner
A clicking or scraping sound occurs when the grate moves against the cooktop surface
The grate sits unevenly, with one corner visibly raised off the burner cap

Grate wobble on the LRG4115ST is most commonly caused by worn or chipped rubber feet on the underside of the grate, a warped cast iron grate from heat stress, or debris buildup around the burner cap preventing the grate from seating flush.

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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

Remove all grates from the cooktop, flip them over, and inspect the rubber foot pads on the underside. These small pads are what keep each grate sitting level and stable — if even one is missing, cracked, or hardened with age, the grate will rock on the cast iron surface. Pay close attention to corners, as those pads take the most load and wear out first.

Step 2

Carefully remove any damaged or deteriorated pads using a flat-head screwdriver for adhesive-mounted types, taking care not to gouge the cast iron. Once removed, clean each mounting surface thoroughly with isopropyl alcohol and let it dry completely — residual grease or old adhesive will prevent the new pads from bonding correctly and they’ll peel off quickly under heat cycles.

Step 3

Peel the backing from each new rubber foot pad and press it firmly onto its mounting surface for at least 30 seconds per pad to ensure a strong bond. New pads restore the cushioned gap between the grate and cooktop surface that prevents metal-on-metal rocking. Pro tip: use pads rated for high-temperature adhesion, since standard foam pads can soften and fail near burner heat.

Step 4

For grates that span two burners, wobble can also be caused by an unlevel cooktop surface rather than worn pads, so place a bubble level across the cooktop in both directions to check. If the surface is off, adjust the front leveling feet at the base of the range — typically turned by hand or with a wrench — until the cooktop reads level. An unlevel range also affects cookware stability and can cause oil or liquids to pool to one side during cooking.

Step 5

Place the grates back onto the cooktop and press down firmly on each corner to verify contact. You should feel firm, cushioned resistance at every point with zero rocking — any remaining movement at this stage points to a pad that didn’t bond fully or a leveling issue that needs further adjustment. Re-check all four corners systematically rather than just pressing the center, since edge contact is where failures show up first.

Step 6

Perform a final load test by setting a heavy cast iron pan on each grate and applying downward pressure while nudging it side to side. A properly restored grate will not rock, shift, or click under load — if it does, remove the grate and identify whether the issue is a pad or a leveling problem before using the range. This test matters for safety, as a rocking grate under a full pot of boiling water is a genuine tip-over risk.

Where to Buy Replacement Parts

Find genuine OEM and aftermarket replacement parts for your LG LRG4115ST (Gas 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 or adjusting grates on the LG LRG4115ST typically costs $20–$80 in parts if you do it yourself, depending on whether you need new rubber feet or full replacement grates. A professional service call for this repair usually runs $150–$300 including labor. Tackling this fix yourself can save you $100 or more.

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Frequently Asked Questions

Why does my LG LRG4115ST grate wobble after cleaning?

Food debris or residue buildup under the grate feet is the most common cause after cleaning. Make sure the cooktop surface and grate rubber feet are completely dry and free of grease before replacing them.

Can a worn rubber foot cause grate wobble on this model?

Yes, the small rubber feet on the bottom of each grate can wear down or fall off over time. Replacement feet are inexpensive and restore a stable, level fit.

Is grate wobble on the LG LRG4115ST a safety concern?

A wobbly grate can tip cookware, which is a burn and spill hazard. Address the issue promptly to keep your cooking surface safe and stable.

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