A symptom tells you how the dryer is misbehaving, not which part failed. These are the usual causes behind each one; the diagnosis at your home confirms which applies.
Not Heating
The drum turns but the air stays cold or barely warm. On an electric dryer, the heater needs both legs of a 240-volt supply; on a gas dryer, the igniter has to light the burner and the flame has to stay lit.
Likely causes
- Thermal fuse blown, usually because the vent is restricted
- Electric heating element open
- Cycling thermostat or high-limit thermostat failed
- Gas igniter, flame sensor or gas valve coils failed on gas models
- A tripped breaker on one leg of the 240-volt circuit on electric models
How we narrow it down: Airflow at the outside vent is checked first, because a restricted vent is the usual reason a thermal fuse blows. Then the fuse, thermostats and element or gas ignition parts are tested. On a gas dryer, watching the igniter separates an igniter fault (no glow) from a valve-coil fault (glows, lights, then won't relight).
Taking Too Long to Dry, or Two Cycles per Load
Clothes come out damp and need a second cycle, even though the dryer heats. This is usually an airflow problem, not a heating problem.
Likely causes
- Lint packed in the vent, especially long runs to the roof
- Crushed or kinked transition hose behind the dryer
- Outside vent flap stuck or clogged, or a bird's nest in the duct
- Heating element partly failed, or one gas valve coil weak
- Moisture sensor coated with residue, ending auto-dry early
How we narrow it down: Air is checked at the outside vent with the dryer running; it should push the flap open firmly. The transition hose and duct are inspected, and the heat output and cycling are measured. In many slab-built homes the vent runs up through the attic to the roof, and those long vertical runs clog faster.
Weak Airflow at the Outside Vent, or Lint Behind the Dryer
The outside vent barely opens, lint collects around the dryer or the outside hood, or the laundry room gets hot and humid. A restricted vent makes the dryer run hotter than it should, and lint is flammable.
Likely causes
- Lint buildup along the duct
- Transition hose crushed behind the dryer
- Plastic or foil hose that sags and traps lint
- Duct disconnected in a wall or attic, venting into the house
- Vent hood damper stuck or screened over
How we narrow it down: The duct is checked from the dryer connection to the outside hood, including attic and wall runs where they're accessible. Damaged or disconnected ductwork is identified, and the dryer's thermostats and fuse are checked for heat damage. A long or complex run may need a dedicated duct cleaning service.
Running Too Hot, or Cabinet Hot to the TouchSafety
Clothes come out too hot to handle, the top or sides of the dryer are unusually hot, or synthetic fabrics shrink or melt. Stop using the dryer until it's checked: overheating is a fire risk.
Likely causes
- Vent restricted, so heat can't leave
- Cycling thermostat stuck closed
- Heating element shorted to the housing, so it heats nonstop
- Blower wheel loose or clogged with lint
- Gas valve not closing between cycles
How we narrow it down: Airflow is checked first, then the cycling and high-limit thermostats are tested. On electric dryers the element is tested for a short to ground; on gas models the valve is checked for shutting off. The blower wheel is inspected. Every part involved in the overheating is replaced, not only the one that failed last.
Burning Smell or SmokeSafety
A burning smell, visible smoke, or a hot-electrical smell while the dryer runs. Turn it off at once. A faint dusty smell the first time it runs after a long break can be normal; a strong or recurring smell is not.
Likely causes
- Lint collected around the heater or burner
- Drive belt slipping on a seized pulley or drum
- Motor overheating
- Terminal block burned at the power cord connection
- Item such as a sock caught near the heater
How we narrow it down: The dryer is opened and the heater area, blower and base cleaned of lint. The belt, idler and rollers are checked for seizing, the motor tested, and the power cord terminal block inspected for scorching. The damaged parts are replaced before the dryer runs again.
Gas Smell from a Gas DryerSafety
A smell of gas near a gas dryer. Don't switch anything on or off. Leave the house and call CPS Energy or your gas provider from outside. A repair visit comes once the utility has made it safe.
Likely causes
- Loose or damaged gas connector behind the dryer
- Shut-off valve or fitting leaking
- Gas valve on the dryer leaking
- Burner not lighting while gas flows
How we narrow it down: After the utility has cleared the site, every gas joint is leak-tested, the connector checked for age and damage, and the dryer's gas valve and ignition tested. Any fitting or connector that's disturbed is leak-tested again before the dryer goes back into use.
Drum Not Turning
The motor hums or runs but the drum stays still, or it turns only with a push.
Likely causes
- Drive belt broken or slipped off
- Idler pulley seized
- Drum rollers or glides worn or seized
- Motor failed or its start switch stuck
- Door switch not signalling closed
How we narrow it down: The drum is turned by hand to feel for drag and a broken belt. The idler, rollers and glides are inspected with the cabinet open, and the motor tested. Worn drum support parts are replaced together.
Won't Start or No Power
Nothing happens when you press start, or the display lights but the drum never turns.
Likely causes
- Breaker tripped, or only one leg of a 240-volt breaker tripped
- Door switch failed
- Thermal fuse blown (on many models this stops the motor, not just the heat)
- Start switch or control fault
- Motor failed
How we narrow it down: Power at the outlet is checked, including both legs on an electric dryer. The door switch, thermal fuse, start switch and motor are tested in order. On models where the thermal fuse cuts the motor, a blown fuse also means checking the vent.
Squealing, Thumping or Scraping Noise
A squeal as the drum turns, a rhythmic thump, or a scraping sound.
Likely causes
- Drum rollers worn
- Idler pulley bearing worn
- Drum glides or felt seal worn, so the drum rubs
- Blower wheel loose or holding debris
- Belt worn with a flat spot
How we narrow it down: The drum is turned by hand and the noise traced with the cabinet open. Rollers, idler, glides and belt are inspected and the worn parts replaced. Worn support parts are usually replaced together so the next one doesn't fail shortly after.
Stops Mid-Cycle and Won't Restart Right Away
The dryer shuts off partway through, then starts again only after cooling down for a while.
Likely causes
- Motor overheating from lint buildup or worn bearings
- Restricted vent tripping a thermal safety
- Door switch making intermittent contact
- Control board fault
How we narrow it down: Airflow and lint buildup in the motor area are checked, and the motor is tested for overheating. The door switch is checked under movement. The part causing the shutdown is replaced, and the vent cleared if it contributed.
Auto-Dry Ending Too Early or Running Too Long
Sensor or auto-dry cycles end with clothes still damp, or keep running long after they're dry.
Likely causes
- Moisture sensor bars coated with fabric softener residue
- Moisture sensor wiring or control fault
- Dryness setting too low
- Restricted vent confusing the sensor with humid air
How we narrow it down: The moisture sensor bars inside the drum are cleaned with a little rubbing alcohol, then tested for continuity with a damp cloth. The vent is checked and the dryness level setting reviewed. A faulty sensor or control is replaced.
Door Won't Latch or Drum Won't Start with Door Shut
The door won't stay closed, or it closes but the dryer acts as though it's open.
Likely causes
- Door catch or strike worn
- Door switch failed
- Door hinge bent or loose
- Door seal pulling the door open
How we narrow it down: The latch and strike are checked for wear and alignment, and the door switch tested for continuity. Hinges are tightened or replaced. The failed switch or catch is replaced.
Error Code or Vent Warning
A code or a check-vent or restricted-airflow warning appears. Many newer dryers measure airflow or temperature and warn when the vent is restricted.
Likely causes
- Vent restricted enough to trigger the airflow warning
- Thermistor open or shorted
- Heater circuit fault
- Door or motor signal fault
- Control fault
How we narrow it down: The code is read against the model's service data. For airflow warnings, the vent is checked before anything else; for sensor codes, the thermistor and wiring are tested. The code is cleared only after its cause is fixed.
Timer Not Advancing
On a dryer with a mechanical dial, the dial stays in the same place and the cycle never ends, or it skips ahead.
Likely causes
- Timer motor failed
- Cycling thermostat not cycling, so the timer never advances on auto-dry
- Heater not heating, so auto-dry never senses dry
- Timer contacts worn
How we narrow it down: The heater and cycling thermostat are checked first, because on auto-dry the timer only advances when the heat cycles. Then the timer motor is tested. A failed timer is replaced.
Tripping the Breaker
The dryer trips its breaker as soon as it starts, when the heat comes on, or partway through the cycle.
Likely causes
- Heating element shorted to the housing
- Motor shorted or seizing
- Power cord or terminal block damaged
- Worn or undersized breaker
- Moisture in wiring from a leak nearby
How we narrow it down: The element, motor and terminal block are tested for shorts. When the trip happens is a clue: at start points to the motor, when heat engages points to the heater. Problems with the breaker or house wiring are for a licensed electrician.
