Control lock stuck

This step-by-step repair guide walks you through fixing control lock stuck 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

If your LG LSIS3018SS induction range has a stuck control lock, you may notice one or more of the following symptoms:

The control panel displays a persistent “LOC” or padlock icon that won’t clear
Pressing any surface burner or oven control button produces no response
Holding the Control Lock button for 3 seconds fails to disable the lock
The display remains lit and locked even after cycling the range’s power

This issue is typically caused by a glitched control board, a worn or unresponsive touch panel, or a software fault triggered by a brief power surge or interruption.

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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

Press and hold the Lock button (or Child Lock button) for 3 seconds, which is LG’s built-in control lock release sequence for this model. If the display shows a lock icon that clears after holding, the issue was a simple user-mode lock rather than a hardware fault. If nothing happens after 3 seconds, proceed to the next step rather than pressing repeatedly, as excess input will not help.

Step 2

Unplug the range from the wall outlet for 10 minutes, then restore power. A full power cycle drains residual capacitor charge on the control board, forcing the microcontroller to reboot and clearing most software-latched lock states. Pro tip: do not use the breaker for this step — physically pulling the plug ensures a complete power drop to the board.

Step 3

Remove the rear panel to access the control board and locate the ribbon cable connecting the touchpad assembly to the board. A partially unseated ribbon cable causes intermittent or permanently stuck control signals, including a lock that cannot be toggled. Before touching any internal components, confirm the range is unplugged, and press the ribbon cable connectors firmly on both ends until they click into their ZIF or clip-style locks.

Step 4

With the range still unplugged, spray a small amount of electrical contact cleaner directly onto the Lock button’s contact pad beneath the touchpad, then rapidly press the button 15 times to work the cleaner across the oxidized surface. Oxidized contacts create a high-resistance connection that the board interprets as a continuous button press, which is a common cause of a lock that appears stuck on. Allow the cleaner to fully evaporate for at least 5 minutes before restoring power.

Step 5

If the lock engages randomly, returns on its own, or still cannot be released after completing all previous steps, the control board EBR82797404 is likely faulty and must be replaced. A failed relay or damaged microcontroller trace on this board can permanently assert the lock signal regardless of button input. When sourcing the replacement, verify the EBR82797404 part number on your existing board’s label before ordering, as similar LG induction models use different board revisions.

Step 6

Restore power to the range and test the control lock by toggling it on and off at least three times to confirm consistent, repeatable behavior. Next, activate each induction zone briefly and run the oven to verify no other functions were disrupted during disassembly or the board replacement. If any zone fails to heat or the display shows an error code, note the code and cross-reference LG’s service documentation before proceeding further.

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?

DIY repairs for a stuck control lock on the LG LSIS3018SS typically cost between $0–$50, covering any replacement parts like a control board or membrane switch. A professional service call usually runs $150–$300 once you factor in labor and parts. Tackling this repair yourself can save you $100 or more.

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Frequently Asked Questions

Why is the control lock stuck on my LG LSIS3018SS and won’t turn off?

The control lock can get stuck if the touchpad is unresponsive or if the range lost power during a lock cycle. Try holding the Control Lock button for 3–5 seconds, or disconnect power for 60 seconds to reset the panel.

Will unplugging the induction range fix a stuck control lock?

Yes, a hard reset by unplugging the unit for at least one minute often clears a stuck control lock. Plug it back in and check if the lock indicator light has turned off.

Could a stuck control lock mean my LG LSIS3018SS control board needs replacing?

If the lock persists after resetting, the control board or touchpad membrane may be faulty. Contact a certified appliance technician to diagnose and replace the affected component.

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