What does LG Microwave Buttons Not Working - Causes & Fix mean?

Child Lock is the most common cause. Hold START/ENTER for 4 seconds to unlock, then test. If still dead, power reset or service needed.

How do I fix LG Microwave Buttons Not Working - 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 Buttons Not Working - Causes & Fix?

The most frequently replaced parts for LG Microwave Buttons Not Working - 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 Buttons Not Working - 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 Buttons Not Working - Causes & Fix

LG Microwave Buttons Not Working — What’s Happening

When your LG microwave buttons stop responding, the keypad is not registering input. This is not an error code displayed on the screen. It is a troubleshooting symptom that LG addresses in their support materials.

LG documents this as a control panel unresponsive condition. The Start button may be locked out by Child Lock, or the entire keypad may be dead due to a power glitch, moisture intrusion, or a hardware failure in the touchpad or control board.

Jump to Fix

Most Likely Causes

Child Lock is active LG lists this as the first and most common cause for a non-responding keypad or Start button.
Power interruption or logic lockup A brief power cycle clears temporary logic faults that freeze the control panel.
Moisture in or around the keypad Water or humidity on the membrane touchpad prevents signal contact.
Worn or damaged touchpad membrane Repeated use wears down the conductive traces in the overlay.
Ribbon cable or connector failure The flexible connector between the touchpad and control board can come loose or corrode.
Faulty button hardware LG’s Saudi support page lists a faulty button as a possible reason when Start does not work.
Failed main control board If the keypad signal path is intact but the board does not respond, the PCB has failed.

How to Diagnose and Fix

Verify Child Lock status by holding START/ENTER for about 4 seconds until the lock indicator appears or disappears, or check your model’s owner’s manual for the specific unlock procedure.
Unplug the microwave for 2 to 3 minutes to perform a full power reset, then restore power and retest all buttons.
Inspect the touchpad overlay for visible moisture, cracks, or contamination and wipe clean with a dry cloth if needed.
Remove the control panel cover per your model’s service manual and inspect the membrane keypad ribbon connector for corrosion or looseness.
Reseat the ribbon cable connector firmly into the main control board socket and retest the keypad.
If the keypad remains dead after reseating, replace the membrane touchpad or control panel assembly depending on your model’s design.
If a new touchpad does not restore function, replace the main control board.
If the panel is still unresponsive after these steps, LG states the unit requires service.

Parts You Might Need

Part	Notes
Membrane keypad or touchpad overlay	Amazon \| The flexible interface layer that registers button presses.
Control panel assembly	Amazon \| Includes the touchpad, overlay, and sometimes the mounting bracket.
Main control board (PCB)	Amazon \| Replace if the keypad signal path is good but the board does not respond.

If your appliance also shows a code on the display, these match this problem:

When to Call a Pro

If the Child Lock and power reset steps do not restore your keypad and you are not comfortable removing the control panel or working with ribbon connectors, call a qualified appliance technician. LG’s official guidance is that an unresponsive control panel after these basic steps requires service. If you have already replaced the touchpad and the problem persists, a technician can test the control board signal path and determine whether board replacement is needed.