A dryer that runs but does not heat is one of the most common laundry repairs. The drum turns, the timer counts down, and the clothes come out as wet as they went in, or barely warm. Sometimes it heats a little and takes two or three cycles to dry a normal load.
The causes split into two groups: the heat source itself (an element, a gas valve or igniter, a fuse) and airflow (a lint-choked vent that makes the dryer overheat and shut its heat off). This guide covers both, what you can safely look at, when the problem is a fire-safety issue, and what the repair usually costs.
What you notice
- The drum tumbles and the cycle runs, but the air inside stays cold or only slightly warm.
- A normal load takes two or more cycles to dry.
- The top of the dryer or the laundry room gets noticeably hot while the clothes stay damp.
- Clothes come out hot but still wet, which points to airflow rather than heat.
- A burning or singed smell during a cycle.
- The dryer stops partway through a cycle, or shows an error code about airflow or temperature.
Likely causes
A restricted vent or full lint screen
Lint builds up in the duct behind the dryer, in the run to the outside wall, and in the outdoor hood. The dryer cannot move enough air, overheats, and the safety thermostat cuts the heat. This is the first thing a technician checks and the most common cause of long drying times. It is also a fire risk.
A blown thermal fuse
A one-time safety fuse that opens when the dryer overheats, almost always because of a blocked vent. The dryer tumbles with no heat afterward. Replacing the fuse without clearing the vent means it will blow again.
A failed heating element (electric dryers)
The coil breaks or burns through, so there is no heat at all. Common on dryers more than a few years old, and quick to replace.
Igniter, flame sensor or gas valve coils (gas dryers)
The igniter glows but the gas does not light, or the burner lights and cuts out after a few minutes. Each points to a different part, and all are routine repairs.
Only half the power reaching an electric dryer
Electric dryers use a double breaker. If one half trips, the motor runs on the remaining leg but the element gets no power. A technician checks this at the outlet; it is not something to test at home.
A cycling thermostat, high-limit thermostat or control board
The parts that regulate heat can fail open so the element never turns on, or the control stops calling for heat. Less common and found with a meter.
Safe things to check before anyone comes out
- Confirm the cycle selected has heat. An air-fluff, eco or no-heat setting looks exactly like a broken dryer.
- Pull out the lint screen and look at it. If it is packed, or if lint is visible in the slot below it, airflow is restricted.
- Step outside and look at the dryer vent hood while the dryer runs. The flap should lift and you should feel air. A flap that barely moves means the duct is blocked.
- Look at the duct behind the dryer if it is visible without moving the machine: crushed, kinked or foil-type flexible duct is a common restriction.
- Note whether the dryer is gas or electric and whether the drum gets even slightly warm during a heated cycle.
- For a gas dryer, note whether the water heater or range still light. If nothing gas in the house works, the supply may be off.
- Note any burning smell, and whether the top of the dryer gets hot.
- Write down the model number if the label is on the inside of the door where you can read it.
When to stop and call
- There is smoke, a gas smell, sparking, or a burning smell that does not go away when the dryer is off. Leave the dryer off, open a window, and if you smell gas, leave the house and call the gas utility from outside.
- The dryer gets very hot on top or the clothes come out scorching while still damp. That is an overheating dryer and a fire risk; stop using it until it is checked.
- You see scorch marks or melted plastic around the vent connection or the outdoor hood.
- The dryer trips the breaker repeatedly.
- A gas dryer lights and goes out, or you hear repeated clicking from the burner area with no heat.
What the technician does
- Confirms the symptom, checks the settings and the lint screen, and measures the airflow at the exhaust.
- Checks the outlet voltage on an electric dryer and the gas supply and shutoff valve on a gas dryer.
- Opens the cabinet and tests the thermal fuse, thermostats, heating element or gas ignition parts with a meter.
- Inspects the duct from the dryer to the outside wall and clears it if lint is the cause, or recommends a dedicated vent cleaning for long or complex runs.
- Replaces the failed part, cleans lint from inside the cabinet and around the motor and heater, and reassembles.
- Runs a heated cycle, checks the exhaust temperature and airflow, and explains what caused it and how often to clean the vent.
What it usually costs
Heat repairs are among the more predictable appliance jobs. A thermal fuse, thermostat, igniter or flame sensor with labor usually comes to the diagnostic fee plus a modest part and labor charge, often in the low hundreds of dollars. A heating element or gas valve assembly is somewhat more. A full vent cleaning is a separate charge that depends on the length of the duct. The estimate should be explained before any work starts.
What moves the estimate
- Which part failed and whether the vent also needs clearing.
- Gas versus electric, and whether the dryer is stacked or in a tight closet that takes longer to access.
- Length and routing of the vent duct, especially runs through an attic or crawl space.
- Brand and part availability.
- Same-day or after-hours service.
Keeping it from coming back
- Clean the lint screen before every load, and wash it with warm water every few months if dryer sheets have left a film on it.
- Have the full vent run cleaned at least once a year, more often with a long run, a large household or pets.
- Make sure the outdoor hood flap moves freely and is not blocked by shrubs, snow or a bird nest.
- Use rigid or semi-rigid metal duct, not plastic or thin foil, and keep it as short and straight as possible. Ask the technician to check it.
- Do not overload the drum. A load that fills it more than three-quarters dries slowly and traps lint.
- Never run the dryer without the lint screen in place.
Questions people ask
The dryer heats but takes forever. Is it the same repair?
Usually it is airflow rather than a part. A blocked vent makes the dryer cycle its heat off to protect itself, so drying stretches to two cycles. Clearing the vent often solves it, and it also removes the fire risk.
Should I replace the thermal fuse myself?
The fuse blows because the dryer overheated, almost always from a blocked vent. Replacing it without finding and fixing the cause means it will blow again, or worse, the dryer will overheat without protection. Have the whole system checked.
My electric dryer runs but there is no heat at all. Could it be the house wiring?
Yes. Electric dryers need both halves of a 240-volt circuit. If one half has tripped or a wire at the outlet has failed, the motor runs and the element does not. The technician checks this at the outlet first; do not test it yourself.
Is a dryer worth repairing?
Dryers are simple machines and most heat repairs cost a fraction of a new unit, so they are usually worth it unless the drum bearings, motor and heater are all failing at once. Ask for the estimate and compare.
Sources
- GE Appliances: Electric Dryer - Runs But Does Not Heat products.geappliances.com
- Whirlpool Product Help: Not Heating - Gas Dryer producthelp.whirlpool.com
- Frigidaire: My dryer is running, but does not seem to be heating owner.frigidaire.com
- Samsung: Clothes are not dry after using Samsung dryer www.samsung.com