How to Fix Drum not turning on LG DLE3400W (Electric)

Drum not turning

This step-by-step repair guide walks you through fixing drum not turning on your LG DLE3400W (Electric). With the right tools and parts, most homeowners can complete this repair in 1–2 hours and avoid a costly service call.

Part of our Top 20 Dryer Models & Common Repair Issues Guide. Browse all dryer repair guides for related models and issues.

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Common Symptoms & Causes

If your LG DLE3400W drum has stopped turning, you may notice one or more of the following signs during normal operation.

The dryer powers on and produces heat, but the drum remains completely still
You hear a humming or buzzing sound when the cycle starts, but nothing rotates
Clothes come out damp after a full cycle despite the dryer running
A loud squealing or thumping noise occurs just before the drum stops moving

These symptoms are most commonly caused by a broken or stretched drive belt, a worn idler pulley, or a failed drum motor — all of which are standard wear-related failures on electric dryers.

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Safety First

Unplug the dryer from the power outlet before starting any repair — never work on a live appliance.
Wear work gloves when handling metal brackets, sheet metal edges, or sharp components.
Take photos with your phone before disconnecting any wiring harnesses or connectors.
Work in a well-lit area with enough floor space to lay removed panels flat.

Tools & Parts Needed

Essential Tools

Phillips #2 screwdriver
¼” nut driver
Putty knife
Multimeter
Work gloves

Replacement Parts

Step-by-Step Repair Instructions

Step 1

Unplug the dryer before touching anything, then open the door and rotate the drum by hand. A drum that spins freely with zero resistance means the drive belt has snapped; a drum that won’t budge at all points to a seized support roller or idler pulley. Identifying which failure you have before disassembly saves you from ordering the wrong part.

Step 2

Remove the rear panel by taking out the five ¼-inch hex screws, then reach inside to visually confirm whether the belt is broken or simply thrown off the pulleys. While you’re in there, grab the idler pulley and spin it by hand — rough grinding or a pulley that won’t rotate means the bearing has seized and will destroy a new belt quickly if not replaced. Pro tip: photograph the original belt routing before removing anything so you have a reference when reinstalling.

Step 3

Slide the drum straight rearward to lift it free from the support rollers, then inspect all four rollers — two on the rear panel and two on the front bulkhead. You’re looking for flat spots, excessive wobble, or rollers that are locked and won’t spin freely, any of which cause loud thumping and uneven belt wear. Always replace the rollers as a complete set; mixing old and new rollers creates uneven load and shortens the life of the new parts.

Step 4

Loop the new drive belt around the drum with the ribbed side facing inward against the drum surface, which is what gives the belt traction to turn the drum. Thread the belt under the idler pulley and then over the motor pulley so the assembly forms a Z-shape when viewed from the side — the idler sits beneath the belt to apply outward tension and keep the belt from slipping. If the belt ribs face the wrong direction or the routing is reversed, the drum will either slip or the belt will wear through within a few cycles.

Step 5

Lower the drum back into the cabinet and seat it firmly onto all four support rollers before releasing it. Check that the belt sits centered in the drum’s belt groove all the way around; a belt riding toward either edge will fray and break prematurely. Spin the drum slowly by hand one full rotation to confirm the belt tracks straight and the idler pulley moves freely under tension.

Step 6

Reinstall the rear panel and tighten all five screws snugly but without over-torquing, which can strip the sheet-metal threads. Plug the dryer back in and run a ten-minute timed cycle, listening for quiet, steady rotation with no squealing, thumping, or grinding. Any abnormal noise during this test cycle means a roller or pulley is still suspect and should be re-inspected before regular use.

Where to Buy Replacement Parts

Find genuine OEM and aftermarket replacement parts for your LG DLE3400W (Electric) on Amazon:

When to Call a Professional

If the issue persists after completing all steps above, the problem may involve the sealed refrigerant system, a failed main control board, or wiring that requires specialized diagnostic equipment. Contact a licensed appliance technician — attempting sealed-system repairs without EPA 608 certification is illegal and unsafe.

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How Much Does This Repair Cost?

DIY parts for fixing a drum not turning on your LG DLE3400W typically cost between $15–$80, depending on whether you need a drive belt, motor, or idler pulley. A professional repair service call usually runs $150–$300 once you factor in labor and diagnostic fees. Tackling this repair yourself can save you $100 or more.

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Frequently Asked Questions

How do I know if the drive belt is the cause of my LG DLE3400W drum not turning?

Open the dryer door and try spinning the drum by hand — if it spins with almost no resistance, the drive belt is likely broken. A functioning belt creates noticeable tension when you rotate the drum manually.

Can the LG DLE3400W drum stop turning even if the dryer still produces heat?

Yes, the heating circuit and drum motor operate independently, so your dryer can generate heat while the drum stays completely still. This usually points to a failed drive belt, motor, or idler pulley.

Is it safe to run my LG DLE3400W if the drum isn’t turning?

No, running the dryer with a stationary drum is a fire hazard because clothes sit directly against the heating element without moving. Stop using the appliance immediately and complete the repair before running another cycle.

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