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Why did my dryer stop spinning? Causes and fixes

By: Reliable Parts • July 2026

A dryer that hums or heats but whose drum won’t turn is most often caused by a broken drive belt, a failed idler pulley, or seized drum support rollers. The quickest test: turn the drum by hand. If it spins with no resistance, the belt is broken. If it barely moves, the rollers or pulley have seized. Identify your dryer’s model number to order the correct replacement parts.

Need step-by-step instructions for your specific brand and model? Visit our DIY Repair Guide and filter by appliance and brand.

Safety information

Unplug the dryer at the outlet before opening the cabinet - the breaker alone is not sufficient. Electric dryer heating circuits carry 240 volts. On gas models, do not move the dryer beyond its flex line without shutting the gas valve; if you smell gas, stop, leave the area, and contact your gas utility.

Most common causes

  1. Broken drive belt — the single most common cause; the motor runs but the drum sits still and turns freely by hand.
  2. Failed idler pulley — a seized pulley burns through the belt or lets it slip off the motor shaft.
  3. Seized drum support rollers — rollers that lock up hold the drum with heavy resistance and often squeal before failing.
  4. Broken belt switch — on many models a broken belt trips a switch that stops the motor entirely, so the dryer won’t run at all.
  5. Failed drive motor — the motor hums and trips its overload instead of running; less common than belt failures.
  6. Obstruction between drum and bulkhead — a sock or garment wedged in the gap can stall the drum.

Step-by-step diagnosis

  1. Turn the drum by hand with the dryer off. Free spinning with no resistance means the belt is broken. Heavy resistance means seized rollers, a jammed pulley, or an obstruction. Normal belt-tension resistance points elsewhere - motor or switch.
  2. Unplug the dryer, open the cabinet, and inspect the belt. A broken belt is usually lying in the base. Note the belt routing before removing the old one - ribbed side against the drum, looped through the idler and motor pulley.
  3. Check the idler pulley while the belt is off. It should spin freely and quietly with no wobble. A seized or rough pulley must be replaced - it will destroy a new belt within weeks.
  4. Inspect the drum support rollers. Spin each by hand and replace the full set if any roller is seized, flat-spotted, or wobbling on its shaft.
  5. Check the gap between the drum and the front and rear bulkheads for wedged clothing or debris, and confirm the drum turns freely before reinstalling the belt.
  6. Test the belt switch if the dryer won’t run at all. On models with a belt-break switch, a snapped belt opens the motor circuit. The switch sits near the idler; test continuity with the belt tensioned.
  7. Evaluate the motor last. If the belt, pulley, and rollers are good but the motor hums and shuts off, its start winding or centrifugal switch has failed. Replace the motor.

Replacement parts to consider

Common parts for a drum that won’t turn: drum belt, idler pulley, drum support roller kit, belt switch, drive motor. Enter your dryer’s model number on reliableparts.com for the exact parts for your specific model.

Related FAQs

How do I know if my dryer belt is broken?

Turn the drum by hand with the dryer off. A drum that spins freely with almost no resistance means the belt is snapped - an intact belt gives noticeable drag. Confirming takes opening the cabinet; the broken belt is usually lying in the base of the machine.

How much does it cost to replace a dryer belt?

A drum belt typically costs $10-25 and replacement is a common DIY job: open the cabinet, route the new belt around the drum, and thread it through the idler pulley and motor shaft. Professional replacement generally runs $100-200 including labor.

Why does my dryer hum but not spin?

Humming without drum movement means the motor is receiving power but can’t do its job: the belt is broken, the drum is jammed by seized rollers or an obstruction, or the motor itself has failed and is tripping its internal overload. Start with the hand-spin test.

Should I replace the idler pulley with the belt?

Yes, if the pulley shows any roughness, noise, or wobble - and many technicians replace it on any belt job past the five-year mark. Maintenance kits pairing the belt, idler pulley, and rollers cost little more than the belt alone and prevent an early repeat failure.

Can I run my dryer without the drum turning to test it?

Only briefly with the drum empty. Running heat with a stationary drum concentrates temperature in one spot and can scorch the drum and trip the thermal fuse. Do diagnosis with the heat setting on air-dry, or keep powered tests to a few seconds.

Why does my dryer hum but the drum won't turn?

A hum with a stationary drum means the motor has power but can’t spin it: a broken belt (drum spins freely by hand), a seized idler pulley or drum roller (drum resists), or a motor with a failed start winding. The hand-spin test at the top of this guide splits those in ten seconds — start there.