Dryer
Dryer not heating: gas and electric causes, and what to check
A dryer that tumbles but stays cold almost always has a reason you can trace, and very often that reason starts with airflow. Here is what to check safely, how gas and electric dryers fail differently, and where the homeowner's part of the job ends.
Safety first
If you smell gas, do not touch the dryer, do not flip light switches or unplug anything, and leave the house. Call your gas company or 911 from outside. That is not a repair situation.
If you smell burning, see smoke or sparks, or get a shock from the cabinet, stop using the dryer. Turn it off and, if you can do it safely, switch off its breaker. Lint is flammable, and a dryer that overheats or arcs is a fire risk.
Nothing in this guide involves opening a gas line, a gas valve or a breaker panel. Those are not homeowner jobs.
The process
What you can safely check first
- Check the settings
Make sure the dryer is not on air fluff, no heat or a delicate setting with very low heat. Try a regular timed cycle on high.
- Check the breaker (electric dryers)
Electric dryers use a double breaker. If one half trips, the drum can still turn but there is no heat. At the panel door, look for a tripped dryer breaker and reset it once by switching it fully off, then on. If it trips again, leave it off and call us. Do not open the panel cover.
- Unplug it before going further
Unplug the dryer or switch its breaker off before you pull it out or touch the duct. On a gas dryer, unplug the power cord only and leave the gas supply alone.
- Clean the lint screen and its slot
Clean the screen, then vacuum down into the slot it sits in with a narrow attachment. Lint packs in there out of sight.
- Check the vent duct and the outside hood
Pull the dryer out gently without stretching the gas line or cord. Look for a crushed, kinked or packed duct. Outside, with the dryer running, the hood flap should open and you should feel strong warm air. Weak air means a clogged vent.
- Run a test load
Reconnect the duct, plug it back in and dry a few damp towels on high. If the heat is back, the problem was airflow, and the vent should be cleaned end to end.
Causes that affect both gas and electric dryers
Restricted airflow. This is where most no-heat calls start. A clogged lint slot, a crushed duct or a vent packed with lint traps heat in the drum. The dryer protects itself by tripping the high-limit thermostat or blowing the thermal fuse. What it looks like: loads take two or three cycles, the top of the dryer gets hot, and eventually there is no heat at all.
Blown thermal fuse. A one-time safety fuse on the blower housing or the heat source. When it blows, the dryer either has no heat or will not start at all, depending on the brand. A blown thermal fuse is a symptom. Replacing it without fixing the airflow problem that blew it means it will blow again.
High-limit thermostat or cycling thermostat. These turn the heat off when it gets too hot and back on as it cools. When one fails open, there is no heat. When a cycling thermostat sticks, the dryer can run too hot or not heat properly.
Timer, control board or moisture sensor. Less common. A failed relay on the control board or a bad timer contact can cut power to the heat circuit while the motor keeps running.
Our maintenance guide covers the vent cleaning that prevents most of the above.
Electric dryer causes
Heating element. The element is a long coil of resistance wire in a metal housing behind or under the drum. It can burn through, break or short against the housing. What it looks like: tumbling with no heat on every setting, even with a clean vent. A visible break in the coil confirms it on inspection.
Half of the power supply missing. Electric dryers run on 240 volts. The motor runs on half of that and the element needs both halves. A tripped half of the double breaker, a loose wire at the terminal block or a damaged power cord will give you a drum that spins with no heat. If the terminal block or the cord looks scorched, stop using the dryer; that is a burned connection and a fire risk.
Gas dryer causes
In a gas dryer, a hot surface igniter glows, a flame sensor confirms the heat, and gas valve coils open the valve to the burner.
Gas valve coils. The most common gas dryer no-heat failure. The coils weaken with heat over time. What it looks like: the igniter glows, then goes dark with no flame, or the dryer heats for the first few minutes and then stops heating.
Igniter. The igniter is fragile and eventually cracks. What it looks like: no glow at all through the small burner window at the bottom front, if your model has one.
Flame sensor. If it fails, the igniter may stay glowing without ever lighting the burner, or the burner may never light.
All of these are tested and replaced by a technician. Do not remove the burner assembly, loosen fittings or try to light a gas dryer by hand.
When to call a technician
Call us if:
- The settings and breaker are fine, the vent is clear, and it still will not heat.
- The breaker trips again after one reset.
- It heats for a few minutes, then goes cold.
- On a gas dryer, the igniter glows and goes out, or never glows.
- It runs but takes two or more cycles to dry a normal load even after the vent was cleaned.
- It is under a manufacturer, extended or home warranty. Start with the plan; our warranty repair page explains how we handle those visits.
Our technicians have over 15 years of repair experience on gas and electric dryers. We find why the part failed, not just which one, so the fix holds. Our dryer repair service has more detail, you can request a visit here, and we cover homes in Spotsylvania, Orange and King George.
Questions
Dryer heating questions
Why does my dryer spin but not heat?
On an electric dryer, the usual causes are a blown thermal fuse, a failed heating element, a high-limit thermostat or a tripped half of the breaker. On a gas dryer, it is most often the gas valve coils or the igniter. In both, a clogged vent is frequently what caused the failure in the first place.
Can a clogged dryer vent stop the heat?
Yes. With poor airflow, the dryer overheats and the safety devices shut the heat off. Repeated overheating blows the thermal fuse and wears out thermostats and elements.
Is a dryer that is not heating a fire risk?
The no-heat failure itself is not usually dangerous, but the airflow problem behind it can be. Lint packed around the heat source is a known fire cause. If you smell burning or see scorch marks, stop using the dryer.
My gas dryer heats for a few minutes, then stops. What is that?
That pattern usually points to weak gas valve coils, which open the valve when cold and fail once they warm up. It can also be a thermostat problem caused by poor airflow. It needs a technician to test.
Dryer still running cold?
Tell us the brand, whether it is gas or electric, and what you have already checked. We confirm a day and arrival window with you before anything is locked in.