What does LG Microwave Making Loud Noise - Causes & Fix mean?

Usually caused by a misaligned turntable or debris on the roller ring. Remove the tray and support, clean the cavity and wheels, then reseat all parts correctly.

How do I fix LG Microwave Making Loud Noise - Causes & Fix?

Work through the step-by-step fix below. Start with the quick reset and the most common cause, then check the specific part this guide points to. Most fixes need only basic hand tools and the right replacement part.

Can I keep using my LG appliance with this error showing?

Usually not. LG appliances show this error when a part or safety circuit is out of range, so running it can stop the cycle or make the problem worse. Diagnose and clear the error before normal use.

What part is most commonly replaced for LG Microwave Making Loud Noise - Causes & Fix?

The parts that most often fix LG Microwave Making Loud Noise - Causes & Fix are listed in the parts section of this guide. Match the part to your exact model and serial number before you buy.

Is LG Microwave Making Loud Noise - Causes & Fix a DIY repair or do I need a technician?

Many fixes are DIY-friendly with basic tools, such as door switches, drain pumps, water inlet valves, thermostats, heating elements, and filters. Sealed-system, refrigerant, gas, or high-voltage work should go to a licensed technician for safety.

LG Microwave Making Loud Noise - Causes & Fix

LG Microwave Making Loud Noise — What’s Happening

LG treats loud noise as an abnormal-noise symptom rather than a fault code. The company states that a microwave normally produces about 45 to 50 dB of vibration noise while generating high-frequency waves, so some sound is expected during operation. If the noise is unusually loud, LG directs you to check the turntable and supporting stand placement, debris on the rotation axis or wheels, and whether the unit sits on an uneven surface.

For inverter models, LG notes that a noise after cooking is often the cooling fan running during the cooldown cycle and is considered normal. When the noise is truly abnormal, common culprits include improper turntable installation, food buildup inside the oven, incorrect cookware (especially anything with metallic trim or patterns), or a microwave placed on an unstable counter. If basic checks do not resolve the issue, the noise may come from a failing component such as the fan motor, magnetron, or high-voltage parts, which require professional diagnosis.

Jump to Fix

Most Likely Causes

Turntable or supporting stand not seated correctly LG lists mispositioned or misaligned turntable parts as the most common cause of abnormal noise during rotation.
Debris or food residue on rotation axis or wheels Buildup on the wheels, axis, or inside the cavity creates drag or rattling that amplifies during operation.
Microwave on an uneven or unstable surface LG directs technicians to check for rocking or an uneven countertop, which causes vibration and cabinet resonance.
Improper cookware with metallic trim or patterns Metal-lined or metallic-pattern cookware can spark or create loud noise, and LG specifically flags this as a cause.
Cooling fan running on inverter models LG states that a post-cooking noise is often the cooling fan during the cooldown process and is normal behavior.
Failed fan motor or magnetron If the noise is a true mechanical or electrical failure rather than a normal sound, the cooling fan motor or magnetron are common sources of loud buzzing or humming.
Defective high-voltage component (diode, capacitor, or transformer) Third-party repair guidance points to high-voltage parts as potential sources of abnormal electrical noise when they fail.

How to Diagnose and Fix

Identify whether the noise is normal or abnormal by comparing it to LG’s statement that normal operating vibration is about 45 to 50 dB, and on inverter models confirm whether the sound is simply the cooling fan during cooldown.
Remove the turntable tray and supporting stand, then inspect both for cracks, chips, or warping and verify that the rotating plate and support are designed for your model.
Clean the cavity and rotation path by wiping down the rotation axis, wheels, and interior surfaces to remove any food buildup or debris that could bind or rattle.
Reinstall the turntable support on the rotation axis so it sits flat and centered, then place the tray on top and spin it by hand to check for wobble or binding.
Verify cookware by running the microwave with only manufacturer-approved nonmetallic dishes and removing anything with metallic trim, foil, or decorative metal patterns.
Level the appliance by checking for rocking on the countertop and relocating or shimming the microwave if the surface is uneven.
Isolate the noise source by running the oven empty (with a cup of water for load) and listening to determine whether the sound comes from the turntable area, the rear cooling fan, or the high-voltage section.
If the noise persists after all basic checks, note the exact timing and character of the sound (grinding, buzzing, humming, or rattling) and call for service, because LG states that continuing abnormal noise requires professional diagnosis and component replacement.

Parts You Might Need

Part	Notes
LG microwave turntable tray	Amazon \| The rotating glass plate that sits on the support ring.
LG microwave turntable support or roller ring	Amazon \| The plastic ring with wheels that sits on the rotation axis and supports the tray.
LG microwave cooling fan motor	Amazon \| Used in inverter models to cool internal components after cooking.

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

When to Call a Pro

Call a qualified appliance technician if the noise continues after you have cleaned and reseated the turntable system, verified your cookware, and leveled the unit. LG states that if parts are damaged or broken you should order replacements, and if the noise persists after basic checks, service is required for proper diagnosis. Any repair involving the magnetron, high-voltage diode, capacitor, or transformer requires a trained professional with the tools and knowledge to safely discharge and test live electrical components.