A dryer that runs without heat is one of the most common laundry calls we take in Springfield and Northern Virginia. The good news is that the cause is usually one of a short list of parts, and the parts are inexpensive. The bad news is that one of the causes, a blocked vent, is also a fire risk, so this is a problem worth solving properly rather than living with.
Here is how an electric or gas dryer makes heat, what stops it, and how to narrow down the cause.
Electric or gas? Start here
Electric dryers heat with a coiled element on a 240-volt circuit. Gas dryers heat with a burner lit by an igniter and controlled by gas valve coils. The symptoms overlap but the parts are different, so check which you have. A gas dryer has a gas line and a regular 120-volt plug; an electric dryer has a large three or four-prong plug.
The two-minute check on an electric dryer
Electric dryers use two breakers (or one double breaker). If only one trips, the motor still runs on 120 volts but the heating element gets nothing. Open the panel and switch both breakers fully off and back on. If the dryer heats again, you have found it, but a breaker that trips repeatedly means a fault that needs diagnosis.
The usual causes
- Blown thermal fuse. A one-time safety fuse that opens when the dryer overheats, usually because the vent is restricted. Replacing it without fixing the airflow means it will blow again.
- Failed heating element (electric). The coil breaks and the dryer tumbles cold. A straightforward replacement.
- Weak igniter or gas valve coils (gas). The classic gas-dryer fault: the dryer heats for a few minutes, then goes cold, then heats again later. Coils that have weakened cannot hold the valve open once they warm up.
- Faulty thermostat or high-limit thermostat. The dryer’s temperature controls fail open and the heater never comes on.
- Restricted vent. Not a heating fault at all, but the dryer senses the heat build-up and cuts the heater, so clothes come out damp and the cabinet runs hot.
- Control board or timer. Less common. The board never closes the heater relay.
Why the vent matters more than you think
Half of the no-heat and long-dry calls we see in Springfield trace back to airflow. Lint collects in the duct behind the dryer, in the run through the wall and at the exterior flap. A crushed flexible hose behind a dryer that was pushed back against the wall does the same thing. Restricted airflow blows thermal fuses, trips high-limit thermostats and, left long enough, starts fires. If the top of your dryer is hot to the touch or there is lint around the exterior vent, have the vent cleaned as part of the repair.
How to tell which it is
- Heats briefly, then goes cold, then heats again: gas valve coils (gas) or a cycling thermostat.
- Never heats, motor runs normally: heating element, thermal fuse or igniter.
- Runs hot, shuts off early, clothes damp: restricted vent, high-limit thermostat.
- Will not start at all: thermal fuse, door switch or start switch rather than a heating fault.
When to call a technician
Call once you have checked the breakers and cleared the lint screen and the dryer still runs cold. Heating elements, igniters, coils, fuses and thermostats are all routine repairs that are worth doing on a dryer of almost any age. Ask the technician to check the vent airflow at the same time.
Frequently asked questions
Quick answers to the questions we hear most about this problem.
Is it safe to keep using a dryer that isn’t heating?
It will not dry clothes, and if the cause is a blocked vent it is a fire risk. Stop using it until the cause is found.
How long should a dryer take to dry a normal load?
Around 45 minutes to an hour for a full load on a healthy dryer with a clear vent. Two cycles for one load means airflow or heat is restricted.
How much does it cost to fix a dryer that won’t heat?
Elements, fuses, thermostats and igniters are among the more affordable appliance repairs. Our $75 diagnostic fee covers the inspection and diagnosis and is applied toward the approved repair.
Related services
Need a hand with it? Alliance Appliance Services diagnoses first and explains the repair before any work starts. Call (571) 303-8548 or request a repair online. We serve Springfield, Alexandria, Fairfax, Arlington and the surrounding Northern Virginia communities.