Dryer Not Heating — Common Causes and Fixes

When your dryer tumbles but produces no heat, clothes come out damp and the frustration mounts. This is one of the most common appliance complaints among Canadian homeowners, especially during cold winter months when line-drying isn't an option. The good news is that the cause is usually one of a few well-known components, and some can be checked without professional help.

A blown thermal fuse is the most common cause — this safety device cuts power to the heating element when the dryer overheats. A clogged lint trap or exhaust vent restricts airflow and causes overheating, which triggers the thermal fuse. A failed heating element, broken igniter (gas dryers), or faulty cycling thermostat are other possibilities.

A multimeter for continuity testing (CAD $20–$40), a screwdriver set, a replacement thermal fuse (CAD $8–$20), and a dryer vent cleaning brush kit (CAD $15–$28). Always unplug the dryer before any inspection.

1. Clean the lint trap thoroughly — a clogged trap is the most common trigger.
2. Disconnect the dryer vent hose from the back and clear any lint buildup. Use a vent brush to clean the full length of the exhaust duct.
3. Check the circuit breaker — electric dryers use a double breaker. If one side trips, the drum spins but the element won't heat.
4. If the above steps don't resolve it, unplug the dryer and locate the thermal fuse (usually on the exhaust duct inside the back panel). Test it with a multimeter — if there's no continuity, it needs replacing.
5. Replace the thermal fuse by removing two screws and disconnecting the wire terminals. Install the new one and reassemble.

If the thermal fuse blows again shortly after replacement, there's an underlying issue — likely a blocked vent you couldn't fully clear, a faulty cycling thermostat, or a failing heating element. An appliance technician can diagnose the root cause and ensure the dryer operates safely. Gas dryers should always be serviced by a professional if the igniter or gas valve is suspected.