What does LG Dishwasher Smells Bad - Causes & Fix mean?

Most often caused by food debris trapped in the filter or sump. Clean the filter assembly under running water and run a citric acid cycle.

How do I fix LG Dishwasher Smells Bad - 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 Dishwasher Smells Bad - Causes & Fix?

The most frequently replaced parts for LG Dishwasher Smells Bad - 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 Dishwasher Smells Bad - 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 Dishwasher Smells Bad - Causes & Fix

LG Dishwasher Smells Bad — What’s Happening

A bad smell in an LG dishwasher is a maintenance condition, not an electronic fault code. LG’s own odor guidance points to food residue stuck in the filter, tub, drain area, or spray arms as the main issue in an older unit. For a newly installed dishwasher, a burning-like smell from new rubber, plastics, internal coils, and damping materials can be normal and should decrease after about 10 to 20 uses.

When the dishwasher has been in use for a while, the odor typically comes from food debris that accumulates in narrow gaps, the filter assembly, the bottom of the tub, or inside the spray arm passages. Standing residue near the bottom of the machine or poor drainage encourages odor buildup. LG treats this as a cleaning and maintenance issue rather than a defect.

Jump to Fix

Most Likely Causes

Food debris in the filter or sump area LG identifies trapped food residue in the filter and the bottom of the unit as the most common source of dishwasher odor.
Residue trapped in spray arms or narrow internal gaps Food particles lodge in spray arm holes and tight internal crevices where they are not fully flushed during wash and drain cycles.
Unclean tub and interior surfaces Buildup on the tub walls, door gasket, and corners accumulates over time and creates persistent odor.
Standing residue or poor drainage near the bottom Water and food particles that do not drain completely sit in the base and develop odor between cycles.
New-unit off-gassing or burning-like odor LG states that a burning smell during the first 10 to 20 uses is normal and comes from new rubber, plastics, coils, and damping materials.

How to Diagnose and Fix

Confirm whether the dishwasher is newly installed. If the unit has been used fewer than 20 times and the smell is burning-like, LG says this is normal off-gassing and should lessen with continued use.
Remove the bottom rack and take out the filter assembly. Clean the filter under running water with a soft brush to remove all trapped food particles.
Inspect the bottom of the tub and the drain area for visible food debris. Remove any buildup by hand or with a damp cloth.
Check the spray arms for blockage. Remove each spray arm and clear any clogged holes so water can flow freely, then wipe off residue from the interior surfaces.
Wipe down the door gasket, tub walls, and corners with a cloth to remove any film or residue.
Run an odor-cleaning cycle. Place 3 tablespoons (1.5 oz) of citric acid powder in the main wash compartment or place about 7 to 10 oz of white vinegar in a shallow bowl on the upper rack. Do not pour vinegar directly into the base.
Start an Auto cycle with no detergent. LG specifies this method for deodorizing the interior.
Verify the odor after the cleaning cycle completes. If the smell returns quickly, re-check for hidden debris in the sump, drain path, filter screen, and spray arm passages.

Parts You Might Need

Part	Notes
LG dishwasher filter assembly	Amazon \| Replace if the filter is damaged or cannot be cleaned and odor persists.
LG dishwasher spray arm	Amazon \| Replace if the arm is cracked, heavily scaled, or rotation is obstructed after cleaning.

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

When to Call a Pro

If you have cleaned the filter, tub, spray arms, and drain area and run a full citric acid or vinegar cycle but the odor returns within a few uses, call a technician. Persistent smell after thorough cleaning can indicate hidden debris in the sump assembly, a partially clogged drain path, or a problem with the drain pump that prevents complete water evacuation. A professional can disassemble the lower sump area, inspect the drain pump and hose for blockage, and verify that all internal passages are clear.