LG Dishwasher Vent Fan
Wet plastics on the top rack do not mean your fan has failed — that is how condensation drying behaves. Check the rinse aid level first, then hold a hand near the vent slot during the drying phase. No airflow at all, or wet ceramics and glass as well, points at the vent fan motor: part 4681A20064U, behind the door…
What this fan is and is not#
It is not the wash motor and it has nothing to do with circulating water. It is a small, low-wattage motor in the vent assembly, mounted either on the door or at the top of the tub.
LG dries differently from brands that fit a dedicated heated element. The final rinse heats the water; once that drains, the fan runs to draw humid air across the stainless tub walls, where the moisture condenses and drains away. The fan is not blowing hot air at your dishes — it is moving damp air out of the way. That is why the motor runs slowly, quietly, and on very little power.
The reason LG made that choice is energy: a drying element draws 500-700W for half an hour or more, while this fan uses under 20W. It is why these machines rate well on Energy Star and why they disappoint anyone expecting oven-dry results.
Is it broken, or is it working as designed?#
| What you observe | Verdict |
|---|---|
| Plastics wet, glass and ceramic dry | Normal. Plastic holds no heat from the final rinse, so nothing evaporates off it |
| Everything wet, including ceramics | Suspect the fan |
| Everything wet and the rinse aid is empty | Refill first — without it droplets bead instead of sheeting off, and no fan can fix that |
| No airflow at the vent slot during drying | Fan motor |
| Buzzing from the vent but no rotation | Bearing failure in the motor |
| Musty smell between cycles | Stagnant humid air sitting in the tub, which grows mould |
Some newer models watch drying fan operation and will raise a code about it. Selecting Extra Dry lengthens the fan run and helps considerably; on models with Turbo Dry, that feature uses the auto door-open mechanism rather than any heater.
Do You Have the Right Tools?
Water pressure gauge ($60), spray arm tester, float switch multimeter ($85), and drain inspection camera. Our technician arrives with $3,000+ in professional tools — your diagnostic is free.
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Replacing the motor#
Turn the breaker off. Open the door and locate the vent assembly — upper-right corner of the door panel on most models, or at the top of the tub cavity toward the rear. You need a Torx T15 for the outer panel, a Phillips #2 for the motor screws, and a flashlight, because the space is tight. A multimeter is optional but will confirm a dead motor before you spend anything.
Door-mounted: take out the 8 Torx T15 screws and lift the outer panel away. The motor sits in a plastic vent housing on the inner panel. Unplug the 2-pin connector, back out the 2-3 mounting screws and draw the assembly out. If the new part does not include the vent duct, transfer it across from the old one.
Top-mounted: the upper spray arm and rack may have to come out to reach the housing on the tub ceiling. The motor is behind a cover plate held by 2 Phillips screws.
The assembly normally arrives as motor, fan blade and mounting bracket together. On some models the fan is integrated into the vent duct, in which case the larger assembly is the part.
Testing the repair honestly#
Run a Normal cycle with a deliberately mixed load — ceramic, glass and a few plastic items. Plastics on the top rack are the acid test. If those come out dry, the fan is doing everything it can.
Safety First — Know the Risks
Live 120V wiring in a wet environment is one of the most dangerous DIY scenarios. Water + electricity = serious shock risk. Our techs are licensed and insured — let them handle the risk.
Licensed & Insured · 90-Day Warranty · Same-Day Service
How long it should last#
Typically 10-15 years. The motor turns slowly under almost no load, so bearings wear very gradually. What actually kills these early is moisture reaching the windings: once the vent duct seal degrades, humid air contacts the motor directly. Worth a look at that seal any time the panel is off.
One thing not to attempt — retrofitting a heated drying element. The tub, harness and control board do not support it, and LG never designed for it.
No airflow at the vent and rinse aid topped up? Request a technician.
Appliance Repair Technician · 8 years experience
Experienced technician with 8 years specializing in dishwasher repairs and European appliance brands including Bosch and Thermador.
