When an LG dryer sounds like it is running but the drum does not move, the issue is almost always in the drive system. LG uses a single belt routed around the drum, an idler pulley for tension, and a motor pulley that drives the assembly. If any of these parts fail, the drum will rotate easily by hand but refuse to turn under power. This problem shows up across many LG families, including ThinQ, Ultra Large Capacity, and older Sensor Dry models.
Got a different LG Dryer Issue? Check out our troubleshooting guide here.
Early Signs and Why This Happens
Most owners notice that the dryer still heats and blows air, but clothes remain in the same position after a few minutes. In some cases a faint burning smell or a light scraping sound occurs right before the drum stops turning. LG belts stretch with age and eventually snap. The idler pulley can seize if its bearing dries out, and the motor switch can wear down after many years of cycling. Any of these failures disconnect the drum from the motor even though the machine appears to run normally.
Initial Checks
| Symptom | Likely Cause | Quick Check |
|---|---|---|
| Drum spins freely by hand | Broken belt | No resistance when spinning drum; belt not visible on drum |
| Drum still won’t turn but belt intact | Seized idler pulley | Pulley feels rough, wobbly, or doesn’t spin smoothly |
| Burning smell before drum stopped | Pulley overheating or belt slipping | Scorch marks on belt area, rubber dust in cabinet |
| Motor runs but drum never engages | Failing motor switch | Drum stays still despite normal motor hum |
| Clunking or scraping just before failure | Pulley bearing or belt degradation | Noise right before drum stopped tumbling |
The first step is to turn the drum by hand. If it moves easily with almost no resistance, the belt has likely broken. A working belt always adds some drag. A technician can unplug the dryer and remove the lower front access panel. LG’s front panels come off with a few screws, and once removed they can see whether the belt is still wrapped around the drum.
If the belt is intact, they’ll check the idler pulley next. The pulley should spin smoothly and put firm tension on the belt. A pulley that wobbles, binds, or feels gritty can stop the drum even if the belt looks fine. Because the belt relies on that tension to grip the motor pulley, a seized idler pulley will make the drum stop turning even while the motor continues running.
If both parts look normal, the dryer’s motor switch becomes a likely suspect. This switch engages the heater circuit and the drum drive once the motor reaches full speed. When the switch begins to fail, the motor can run but the drum never engages. Testing this switch requires access to the motor assembly and is best handled by a licensed professional.
Basic Diagnostic Steps
Start the dryer on a timed cycle and listen closely. If you hear the motor humming normally but do not see any movement inside the drum, the drive system is not engaged. A technician will inspect the belt path, the idler pulley, and the motor pulley. They can check the inside of the cabinet for broken belt pieces, since LG belts often leave rubber dust or strands when they fail. Look for signs of overheating near the idler pulley, because a dragging pulley can leave small scorch marks on the belt before it fails completely.
Typical Repairs and What They Cost
Replacing the belt is usually the simplest fix and stays within a lower cost range. Replacing the idler pulley takes slightly more time but is straightforward once the front panel is removed. A failed motor switch or worn motor pulley costs more, but these issues are far less common on LG dryers compared with belt or pulley wear. Check out this article to get an exact breakdown of what these failures will cost. In most cases the repair is worth doing, since LG motors and drums tend to last a long time once the drive system is restored.
When Repair Makes Sense
If the dryer still heats and the motor runs smoothly, repairing the drive system almost always makes financial sense. LG’s drive components are affordable, widely available, and designed for straightforward replacement. Once the belt and pulley system is refreshed, most LG dryers continue running reliably for many more years. You can see the average lifespan of LG dryers in our full guide. If you’re looking to replace your unit however, check out our guides on the most reliable dryer brands and the most sustainable dryer brands.