The Short Answer
Electric dryer blowing cold: reset both halves of the 240-volt breaker fully off then on, and if heat stays gone the thermal fuse or heating element has failed. Gas dryer: the igniter is the usual suspect, followed by the gas valve coils. Whichever part failed, have the vent checked in the same visit — restricted airflow is what kills most of these components in the first place.
The Half-Tripped Breaker Riddle
Electric dryers draw from a double-pole 240-volt breaker — effectively two linked switches. When only one leg trips, the machine performs a convincing impression of health: drum spinning, timer counting, lights on, and not a degree of warmth. Before suspecting any component, flip the dryer breaker fully OFF, then fully ON, even if it looks untripped — a partially failed leg can sit in a middle position that fools the eye. This free reset resolves enough no-heat complaints that our phone assessment always starts there.
The Parts Lineup
| Component | Fuel Type | The Clue | Worth Knowing |
|---|---|---|---|
| Thermal fuse | Both | Heat vanished suddenly and completely, often after a big or lint-heavy load | A one-time safety device — it blows once and stays blown |
| Heating element | Electric | Heat faded over weeks, or the dryer warms weakly then cools | Coils burn through in sections before failing outright |
| Igniter | Gas | A glow behind the lower panel that clicks off without a flame | The most common gas dryer failure by a wide margin |
| Gas valve coils | Gas | Igniter glows brightly but the burner never lights | Small solenoids that stop opening the valve with age |
| Cycling thermostat | Both | Temperature swings — scorching one load, lukewarm the next | Regulates the heat; erratic when worn |
Sudden Loss vs. Slow Fade
How the heat left is diagnostic gold. Heat that disappeared between one load and the next points to a protective device doing its job — the thermal fuse sacrificing itself against an overheat, or a breaker leg letting go. Heat that faded across weeks, with loads needing a little longer each time, points to an element burning through coil by coil, a thermostat drifting, or a vent slowly packing with lint. Mention which pattern you saw when you book; it changes what we load onto the vehicle.
“A thermal fuse is a smoke detector that dies to save the house — replace it, but interrogate whatever made it blow.”
Field note — The Technician Team
The Culprit Behind the Culprit
Fuses, elements, and thermostats rarely fail in a vacuum. Heat needs somewhere to go, and when a lint-restricted duct traps it inside the cabinet, every thermal component runs hotter and dies younger. That is why our dryer repair visits in Sherwood Park pair every no-heat part replacement with an airflow check — and why a machine with a history of blown fuses should skip straight to the vent cleaning walkthrough. Fixing the part without the cause is renting the repair, not owning it.
No-Heat Questions, Answered
Why does my dryer run but not heat up?
On an electric dryer, the top candidates are a blown thermal fuse, a burned-out heating element, or a breaker that has tripped on only one of its two legs — the drum motor runs on the surviving leg while the element gets nothing. On a gas dryer, suspect the igniter first, then the gas valve coils. All of these are established, single-visit repairs.
What causes a dryer thermal fuse to blow?
Overheating — and overheating almost always traces to restricted airflow from a lint-loaded vent. Replacing the fuse without clearing the duct invites the new fuse to blow within weeks, which is why a proper repair pairs the part with an airflow inspection.
Can I replace a dryer heating element myself?
Mechanically it is within reach of a confident DIYer, but it means opening a 240-volt appliance, verifying the correct replacement element for the model, and — critically — finding out why the original failed. Skipping that last step is how the same repair gets paid for twice. Our flat-rate visit covers part, cause, and a 90-day warranty.