What does LG Microwave LOC Error Code - Causes & Fix mean?

LOC means the control lock (child lock) is enabled. Press and hold STOP/CLEAR until LOC disappears to unlock the keypad and resume use.

How do I fix LG Microwave LOC Error Code - Causes & Fix?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Can I keep running the equipment with this fault active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for LG Microwave LOC Error Code - Causes & Fix?

The most frequently replaced parts for LG Microwave LOC Error Code - Causes & Fix are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is LG Microwave LOC Error Code - Causes & Fix a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

LG Microwave LOC Error Code - Causes & Fix

LG Microwave LOC Error Code — What It Means

LOC on an LG microwave is not an error code. It indicates the control lock or child lock feature is turned on. This safety function locks the keypad to prevent unintended operation, especially when small children are present. The display shows LOC whenever the lock is active, and the control panel will not respond to button presses until you disable it.

LG states that LOC is normal behavior and can be cleared by pressing and holding the STOP/CLEAR button until the display returns to normal. If the lock will not disengage using the standard unlock command, the issue is usually a stuck key on the touchpad or a contaminated keypad membrane. A failed control board can also prevent normal lock toggling, but that represents a hardware failure rather than the meaning of LOC itself.

Jump to Fix

Common Causes

Lock feature was enabled intentionally A user activated the child lock by pressing and holding STOP/CLEAR, or the microwave was left in lock mode after cleaning.
Stuck or jammed keypad button A mechanically stuck STOP/CLEAR or other key continuously signals the lock command and prevents normal unlock.
Contaminated touchpad membrane Spills, grease, or moisture under the keypad overlay create a short circuit that mimics a persistent lock state.
Failed display or user interface board The control board cannot process the unlock command or update the display, leaving LOC visible even when the lock should be off.

Step-by-Step Fix

Verify the display shows LOC and that the microwave otherwise has power and the interior light or clock is visible.
Press and hold the STOP/CLEAR button for three to five seconds until LOC disappears from the display, which is LG’s official unlock method.
Unplug the microwave for 60 seconds if the code does not clear, then restore power and attempt the unlock command again to reset the control state.
Inspect the touchpad for stuck buttons by pressing each key firmly and listening for a click or tactile response, paying special attention to STOP/CLEAR.
Clean the keypad surface with a damp cloth and mild detergent, then dry thoroughly to remove any grease or residue that could short the membrane contacts.
Check for immediate LOC return after clearing, which suggests a shorted touchpad assembly or a button that remains mechanically depressed.
Test the control board response by attempting to start a cook cycle or change settings after unlock. If the panel remains unresponsive or LOC reappears instantly, replace the user interface board or main control board as needed.

Parts Often Needed

Part	Notes
LG microwave touchpad assembly	Amazon \| When a button is stuck or the membrane is shorted and cleaning does not resolve LOC.
LG microwave display control board	Amazon \| When the panel cannot clear lock mode or does not respond to any input after unlock attempts.

When to Call a Pro

Call a technician if LOC will not clear after you have held STOP/CLEAR, power-cycled the unit, and cleaned the keypad. Persistent LOC that returns immediately after clearing or a control panel that remains completely unresponsive indicates a failed touchpad assembly or control board. Board-level diagnosis and replacement require disassembly and proper handling of high-voltage components inside the microwave cabinet. If your microwave is under warranty, contact LG support before attempting any repair to preserve coverage.