Dryers troubleshooting: the cord, the breaker, then the vent.
An electric dryer has three things that go wrong in order — the cord hookup, the 240V supply and the vent. A gas dryer swaps the first two for the igniter and the gas valve. Start at the wall and work in; the vent is behind nearly every "takes forever" and "runs hot" complaint.
First use: what is normal
A new machine can do things on its first run that look like a fault and are not. Here is what the makers say is normal, what to do first, and where the line is.
Normal the first time
- An oily, burning or new-plastic smell for the first few loads. It fades with use.
- A short squeak at start-up that goes away in seconds.
- On a gas dryer, a click and a buzz when the valve opens and a low roar from the flame.
- On a heat-pump dryer, a hum from time to time.
Do this first
- 1Run it empty for 20 minutes to clear the new smell, with the door or a window open afterward.
- 2A heat-pump dryer holds coolant: let it rest for 2 hours before the first use, and empty its water container after each load unless it has a drain.
Where the line is. A burning smell that stays, a thumping sound, or a squeak that starts once it heats up is not normal: stop using it and text us.
Before you touch anything
The install rules that decide most of what follows. Check these once; they rule out the causes that look like a broken machine and are not.
No electric dryer sold in the US ships with a power cord — GE, Samsung, LG, Whirlpool, from any store. The cord is bought separately, 3-prong or 4-prong to match the wall outlet, and wired to the terminal block on the back of the dryer.
An electric dryer needs a dedicated 240V, 30A outlet. Both legs of the double breaker have to be on — one leg down and the drum turns while nothing heats.
Use rigid or semi-rigid metal duct, a short run with few elbows, and a louvered hood outside with no screen. Never white vinyl flex.
No power at all — dead when plugged in
In this order
- Is the cord wired to the terminal block? Pull the small plate on the back: each cord wire sits under its own terminal screw, tight, and the strain relief holds the cord where it enters.
- 4-prong cord: the green or bare ground wire goes to the cabinet ground screw AND the ground strap between the center (neutral) terminal and the cabinet must be removed. 3-prong cord: no ground wire, the strap stays. The wrong setup leaves the dryer dead or the cabinet live.
- Are the terminal screws the right ones? The block needs its own machine screws with the lock washers; screws borrowed from another machine rarely seat the lugs.
- Reset the double breaker fully off and then on — both legs of the 240V have to be live. Test the outlet with a meter: 240V across the two hot slots, 120V from each hot to neutral.
- Is the door switch pressed (the drum light goes off with the door closed)? A dryer with a door it reads as open does nothing.
What is usually behind it
The cord not fully wired at the terminal block (a loose lug, a wire on the wrong terminal, a missing screw), a ground strap set wrong for the cord, a double breaker with one leg out, a dead outlet, or a door switch.
What to do
With the breaker OFF, wire the cord by the diagram on the back plate: outer wires on the outer terminals, the center wire on the center terminal, the strap removed only for a 4-prong cord, every screw tight. Reset the breaker. A dead outlet with a good cord is an electrician's call; a door switch is a small part behind the top panel.
Never touch the terminal block with the breaker on. A burnt smell, a melted plug or a scorched outlet means the breaker stays off and an electrician looks first.
Runs but does not heat (electric)
In this order
- Reset the double breaker fully off and on — one tripped leg turns the drum and heats nothing.
- Is the vent clear? A blocked vent pops the thermal fuse, which kills the heat while the motor runs.
- Is the cycle set to air fluff or no heat?
What is usually behind it
One leg of the 240V out (the motor runs on 120V, the element needs 240V), a thermal fuse popped by a blocked vent, or a burnt heating element.
What to do
Reset the breaker fully. Clean the whole vent run to the outside hood. Then the fuse (a $10 part on the blower housing) or the element — both behind the back or front panel with the dryer unplugged. A fuse that pops again means the vent is still restricted.
Runs but does not heat (gas)
In this order
- Is the gas valve at the wall open?
- Watch through the lower front vent at start: does the igniter glow orange for 15–20 seconds, and does a flame follow?
- Does the igniter glow, then go dark with no flame, over and over?
What is usually behind it
A closed valve, a dead igniter (no glow), or gas valve coils that will not open (glow, then nothing — the most common gas dryer part).
What to do
Open the valve. No glow is the igniter; glow with no flame is the valve coils — both are inexpensive parts behind the lower front panel with the gas shut off and the dryer unplugged.
Gas smell: close the valve, open a window, do not run the dryer, and call.
Takes two or more cycles to dry
In this order
- Pull the dryer out, disconnect the vent and run one load venting into the room (a towel over the opening). Does it dry fast?
- Is the lint screen clean, and does water bead on it (softener film)? Wash it with soap.
- Is the outside hood flap opening when the dryer runs, and free of lint and nests?
- Is the vent run longer than 25 feet, or in vinyl flex?
What is usually behind it
A restricted vent — the lint screen's film, the duct, the elbows or the outside hood. This is the dryer complaint, nine times in ten.
What to do
Clean the entire vent path with a brush kit, replace vinyl flex with metal, shorten the run, and wash the lint screen. A dryer that dries fast venting into the room has nothing wrong with it.
Airflow or vent code on the display (Samsung C80, LG d90, Whirlpool AF, Check Vent)
In this order
- Take the vent hose off the back and run a load venting into the room (a towel over the opening). Does the code stay away?
- Put a two-foot piece of metal duct with one 90° elbow on the back and run it again. Still clean?
- Connect the real run, start the dryer and watch the hood outside — does the flap swing open and stay open?
- Is the piece behind the dryer crushed, kinked or foil flex? How long is the run, and how many bends?
What is usually behind it
The dryer is measuring restriction at its exhaust and reporting it as a percentage. With the hose off the code goes away on nearly every one; the run is too long, has too many bends, is packed with lint, or the hood outside is stuck. The sensor itself is one of the last things to fail.
What to do
Fix the run, not the dryer: rigid metal duct, every 90° counted as 5 feet, under 25 feet all together, the flex behind the dryer replaced with a short semi-rigid piece, the whole run and the hood cleaned. The full rules, the codes by maker and the two-step test are in the dryer venting guide.
The code shows with the hose off, in an open room. The restriction is inside the dryer (the blower housing, a loose inner duct, the sensor) — a service call, and on a machine we sold, a text to us first.
Runs hotter than it should, clothes come out scorching
In this order
- Vent clear and the outside hood opening?
- Is the cycling thermostat sensing (a dryer that never cycles the heat off is a thermostat)?
- Is the load very small? One item overheats in a big drum.
What is usually behind it
A restricted vent trapping the heat, or a cycling thermostat stuck closed.
What to do
Clean the vent first, always. A dryer that still runs hot with a clear vent has a stuck cycling thermostat — a cheap part on the blower housing.
A burning smell during a cycle: stop, unplug or shut the gas, clean the lint out of the cabinet and the vent before it runs again.
Thumping, squealing or grinding
In this order
- Is anything in the drum (a coin, a buckle, a shoe)?
- Thump once per drum turn: a flat spot on a drum roller. Squeal: the idler pulley or the belt. Grind: the drum glides or the blower.
- Spin the drum by hand with it unplugged — does it turn evenly and quietly?
What is usually behind it
Worn drum rollers, a dry idler pulley, a frayed belt, or worn glides — wear parts on every dryer past a few years.
What to do
A roller, idler and belt kit is an afternoon with the cabinet open and the dryer unplugged; the kit is cheap and sold for every model.
Black marks or grease on the clothes
In this order
- Is a drum baffle (the fins inside the drum) cracked or loose?
- Is the drum seal (the felt at the front and back of the drum) worn so the drum rubs the cabinet?
- Did something melt in the drum (a crayon, a pen, a plastic bag)?
What is usually behind it
A cracked baffle, a worn drum seal letting the drum edge rub, or melted debris on the drum.
What to do
Tighten or replace a baffle, replace a worn seal (a wear part), and scrub melted debris off a warm drum with a dryer sheet and some patience.
Lights on, will not start
In this order
- Is the door fully closed and the door switch clicking?
- Is the control lock on, or a delay-start set?
- Does the drum turn by hand? A seized drum trips the motor's overload.
- Press start and hold it a second — does it hum?
What is usually behind it
A door switch, a control lock, a start button or a motor overload after a seized drum or belt.
What to do
Clear the lock, close the door firmly, free the drum. A hum with no turn is the belt or the motor; no hum with the door switch clicking is the start switch or the board.
When it's a warranty call
Every unit leaves with the manufacturer's full factory warranty. These are the faults that warranty exists for — once the checks above have ruled out the install, the power and the vent, call the maker's line with the model and serial, and text us if you want a hand with the claim.
A motor that hums and will not turn a free drum.
A gas valve that will not open with a glowing igniter and the gas on.
A control board that throws the same code after a five-minute unplug.
All units are surplus inventory (open box, cancelled order, customer return, overstock, or minor scratch & dent). Every unit includes the manufacturer's full factory warranty. Please inspect thoroughly in person before purchasing — cosmetic imperfections or missing accessories are possible.
Text us the model number and what it's doing — we'll point you at the next step.
A fix, a part, or a warranty call — the plate's model and serial plus one line about the symptom is all it takes to tell which.
These pages are educational. Every appliance is a little different — follow the manufacturer's manual and local code, and leave gas, water heater and 240V work to a licensed installer.