You pull a load out of the dryer after a full cycle and everything is still damp and cool. The drum turned, the timer ran, but there was no heat. A dryer that’s not heating up is one of the most common laundry calls we get in Toronto, and it’s also one of the most important ones to get right, because the most frequent cause behind it is a blocked vent, and a blocked vent is a fire risk.
This guide walks you through the free checks first, then explains what’s actually making the heat in your dryer, which parts usually fail, and when it’s time to stop using the machine and call a technician.
Before Anything Else: Safety First
If you smell burning, see scorch marks, notice the outside of the dryer is unusually hot to the touch, or you have a gas dryer and smell gas, stop here. Turn the dryer off, unplug it (or switch off its breaker), and for a gas smell, leave the home and call your gas utility from outside. None of the troubleshooting below is worth doing until that’s sorted.
For everything else, unplug the dryer before you remove any panels or reach behind it. Electric dryers run on 240 volts, which is not something to test with your hands.
Step 1: The Free Checks (Do These First)
A surprising number of “no heat” problems are solved here without opening anything.
Check the breaker (electric dryers)
Electric dryers use a double-pole breaker, which is really two breakers tied together. If one half trips, the drum can still turn and the lights still work, but the heating element gets no power. Go to your panel, find the dryer breaker, switch it fully off and then back on. Even if it looks fine, resetting it is worth the 30 seconds.
Check the cycle and settings
- Make sure you didn’t select Air Fluff, Air Dry, Wrinkle Release or any “no heat” option.
- Some dryers have a delicate or low-heat setting that feels almost cool on a full load.
- If your dryer has a child lock or a smart/app mode, make sure nothing is overriding the cycle.
Check the gas supply (gas dryers)
Follow the flexible gas line behind the dryer to the shut-off valve. The handle should be in line with the pipe (open). If someone moved the dryer recently, it’s worth confirming the valve wasn’t nudged closed and the line isn’t kinked.
Clean the lint screen properly
Pull the lint screen out and clean it. If it looks clean but feels stiff, dryer sheets can leave a waxy film that blocks airflow. Wash it with warm water, dish soap and a soft brush, then let it dry fully. Hold it under the tap: if water pools on top instead of running through, it still needs cleaning.
How Your Dryer Actually Makes Heat
Knowing which type you have narrows the problem down a lot.
- Electric dryers push air across a coiled heating element. Power to that element runs through a series of safety devices: a thermal fuse, a high-limit thermostat, a cycling thermostat and a thermal cut-off. If any one of them opens, the element stays cold.
- Gas dryers use a burner. An igniter glows red-hot, a flame sensor confirms it’s hot enough, and gas valve coils open to let gas in. The same kind of thermal fuse and thermostats protect the system.
In both types, the drum and the blower can keep running even when the heat source is dead. That’s why “it turns but doesn’t heat” is so common: the motor circuit and the heat circuit are separate.
The Big One: A Blocked Vent and the Thermal Fuse
If we had to pick the single most common reason a dryer stops heating, it’s this chain of events:
- Lint builds up in the vent duct, often in a long run, a crushed section behind the dryer, or the outside hood.
- Hot, moist air can’t escape, so the temperature inside the dryer climbs.
- The thermal fuse, a one-time safety device, blows to cut the heat before things get dangerous.
Here’s the part many people miss: a blown thermal fuse is a warning sign, not the problem itself. If you just replace the fuse and don’t clear the vent, the new fuse will usually blow again, and in the meantime you’ve been running a dryer with restricted airflow.
How to check your vent
- Go outside while the dryer is running. You should feel strong, warm air coming out and see the vent flap open. Weak airflow means a restriction.
- Look at the duct behind the dryer. Plastic or thin foil ducting that’s crushed, sagging or kinked is a common culprit.
- Check how long drying takes. If loads that used to take one cycle now need two or three, airflow has likely been dropping for a while.
- Check the outside hood for lint, nests or ice in winter.
The City of Toronto’s dryer fire safety guidance says a leading cause of dryer fires is lack of maintenance, and recommends rigid or flexible metal ducting rather than plastic or foil, cleaning the lint screen after every load, and regularly removing lint from ducts and exhaust vents. In condos and apartments where the dryer sits in a closet, it also notes the dryer needs enough incoming air to run properly.
Other Parts That Commonly Fail
If the breaker, settings, gas supply and vent all check out, the problem is usually one of these parts. A technician will test them with a multimeter to confirm which one has failed rather than guessing.
Heating element (electric)
The element is a long coil of wire. Over time it can break, which leaves you with no heat at all. A broken element may be visible as a gap in the coil, but often it needs to be tested. Sometimes an element shorts against its housing, which is a safety issue and usually trips the breaker.
Thermostats and thermal cut-off
The cycling thermostat switches the heat on and off to hold the right temperature. If it fails, you can get no heat, or heat that never shuts off (which is dangerous). The high-limit thermostat and thermal cut-off are extra safety stops, and like the thermal fuse, they often fail because of overheating caused by poor airflow.
Igniter, flame sensor and gas valve coils (gas)
On a gas dryer, watch through the small window near the burner (on many models you can see it after removing a lower front panel or kick plate, but only if your manual says so). Common patterns:
- Igniter doesn’t glow: the igniter, thermal fuse or another switch in the circuit may have failed.
- Igniter glows but no flame: this often points to the gas valve coils.
- Flame lights, then goes out and the dryer cools: could also be the coils, or the flame sensor.
Gas components should be handled by a qualified technician. Working on a gas appliance yourself is not a DIY job.
Timer, control board or moisture sensor
Less often, the heat circuit is fine but the dryer is being told to stop heating too early. A faulty moisture sensor, timer or control board can end the heat early or skip it, and these are best diagnosed by a pro.
Brand Notes: Samsung, LG and Whirlpool
The same basic parts appear across brands, but each one has its quirks:
- Samsung: many models display a heating-related error code when the dryer detects a problem with heat. Check your owner’s manual for your model’s code list, and if a code appears, note it before you call, because it helps the technician bring the right parts. See our Samsung appliance repair page for more.
- LG: many LG dryers have a vent-monitoring feature that can show a warning when airflow is restricted. If yours flags a blocked vent, take it seriously and clean the duct before doing anything else. More on our LG appliance repair page.
- Whirlpool (and related brands like Kenmore, Maytag and Amana): no-heat issues on these machines very often come back to the thermal fuse and a blocked vent. If the fuse has blown more than once, the vent needs attention. Learn more on our Whirlpool appliance repair page.
When to Stop Using the Dryer
Turn it off and leave it off until it’s checked if:
- You smell burning, or anything that smells like hot plastic or rubber.
- You smell gas near a gas dryer.
- The breaker trips repeatedly when the dryer runs.
- The dryer gets very hot on the outside, or clothes come out scorching hot.
- The heat won’t shut off, even when the cycle should be cooling down.
- The thermal fuse has already been replaced and the dryer stopped heating again.
The City of Toronto also recommends not leaving the dryer running when you leave home or go to bed, keeping the area around it clear of things that can burn, and installing a carbon monoxide alarm if you use a gas or propane dryer.
Repair or Replace?
We won’t throw out made-up numbers here, because the real cost depends on your specific dryer. What actually drives the decision:
- Which part failed. A thermal fuse or thermostat is a much smaller job than a control board on a newer machine.
- Whether the vent needs work. A blocked or damaged vent has to be fixed either way. A new dryer on the same blocked vent will have the same problem.
- Age and overall condition. A dryer with a solid drum, good bearings and a quiet motor is often worth fixing. One with several worn parts may not be.
- Parts availability. Some older or less common models have parts that are harder to get.
Our guide on whether to repair or replace your appliances goes into more detail. And if your dryer is also squeaking or squealing, that’s usually a separate wear issue covered in our post on why a dryer makes a squeaking noise.
Quick Recap
- Reset the breaker, check the cycle setting and confirm the gas valve is open.
- Clean the lint screen properly and check the vent for strong airflow outside.
- If the thermal fuse has blown, the vent is the real problem until proven otherwise.
- Elements, thermostats, igniters and gas valve coils need proper testing.
- Stop using the dryer at any sign of burning, gas smell or overheating.
Need a Hand With Your Dryer?
If you’ve done the free checks and your dryer still isn’t heating, I-Fix Appliance Repair can help. Our technicians diagnose and repair electric and gas dryers across Toronto, North York, Scarborough and Etobicoke, and we’ll tell you honestly whether a repair makes sense. Visit our dryer repair page or contact us to book a visit.