Troubleshoot a Dryer That Works But Doesn't Heat Up

Having a dryer that runs but doesn't actually dry your clothes can be infuriating. Fortunately, with some basic troubleshooting, you can likely diagnose and fix the no-heat issue yourself.

With a multimeter and some simple maintenance, you can have your dryer heating properly again in no time.

Check Power Supply

The first thing to check is the power supply to your dryer. Electric dryers require two 120V breakers, while gas dryers need a 120V electrical hookup as well as a gas line. Problems with either can prevent the dryer from heating up.

Test the Circuit Breakers

Locate the circuit breaker box and check for the switches labeled for the dryer--there should be two. Flip both breakers completely off and then back on. This will reset any tripped breakers.

If the breakers trip again shortly after resetting, you likely have a deeper electrical issue that requires professional service. Contact an electrician if that is the case.

Check the Electrical Outlet

Use a multimeter to test the voltage at the outlet where the dryer plugs in. Place the probes into the hot and neutral slots--you should get a reading around 120V.

If not, unplug the dryer and inspect the outlet wiring. Tighten any loose connections and check for scorch marks. If there is damage, hire an electrician to replace the faulty outlet.

Ensure Gas Supply (For Gas Dryers)

Gas dryers require proper gas flow in order to heat up. Check the following areas to ensure supply is not interrupted.

Open the Gas Shutoff Valve

Find the gas shutoff valve on the supply line and turn it to align it with the pipe. This opens it up to allow gas to flow. If it was closed, opening it may resolve your dryer's lack of heat.

Check Propane/Natural Gas Tank Levels

For gas dryers using propane tanks, check that the tank is full. Refill any empty tanks before attempting to relight the dryer's pilot or operate it. The same applies to homes using natural gas - call your utility company if your main supply tank is empty.

Contact the Gas Company

If you have utility-supplied gas, call the gas company to check for any service interruptions in your area. They can dispatch technicians to restore your home's supply if needed. Also ensure billing is up-to-date, as unpaid bills can result in shutoffs.

Clear Lint Buildup

Lint accumulation inside the dryer venting can severely restrict airflow. Insufficient airflow prevents the dryer from heating properly during operation. Carefully clean the system.

Clean the Lint Trap

Lint can quickly build up on the filter screen inside the trap. Remove the trap and use your fingers or a vacuum hose to remove any lint residue. Clean it out before every load.

Detach and Clean Vent Hose

Clogs often form inside the flexible vent hose that connects the back of the dryer to the external vent. Unplug the dryer, disconnect the vent pipe, and clean it out with a vacuum hose. Reattach it securely afterward.

Professionally Clean Ductwork

For excessive lint accumulation, a technician can detach and clean the entire ductwork using specialized tools. Signs like longer drying times indicate substantial buildup.

Diagnose the Heating System

If power and gas supply are confirmed functional, the issue likely lies in the dryer's internal heating components. Diagnosing with a multimeter can isolate the broken part.

Test the Heating Element

Remove the back panel to access the heating element. With the power disconnected, use a multimeter on its lowest ohms setting to check for continuity across the element coils. No continuity means it needs replacing.

Check the Thermostats

There are typically multiple thermostats that regulate operating temperature. Test each one for continuity using the multimeter. If any fail, they will need to be replaced.

Inspect the Door Switch

The door switch disables heat when the door is open for safety. Test its continuity with the door both open and closed. If it does not engage properly, replace the faulty switch.

Test the Cycling Timer

Mechanical timers control the drying cycles. Test its functionality manually using a multimeter. If it fails to advance cycles and activate heat, replace the timer.

Ensure Proper Ventilation

For electric dryers in particular, proper ventilation prevents overheating that shuts off the heating element. Check the external venting for blockages.

Clear Vent Hose Restrictions

Inspect along the flexible vent hose for kinks or tight bends that obstruct airflow. Ensure it is not crushed behind the dryer.

Clean Outdoor Vent Flap

Outside termination flaps can seize up and prevent moist air from exiting. Ensure the flap pivots freely and fully opens when the dryer runs.

Rigid metal ductwork should be smooth, properly sized, and with minimal turns. Inspect that the run from dryer to outside is not damaged or restricted.

Diagnostic testing can help you figure out why your dryer isn't heating up. Our guide covers the most common issues, but for persistent problems, don't hesitate to call in a technician. With the ability to heat again, you can finally get piles of wet laundry under control.