A dryer that runs but produces no heat has a clear diagnostic sequence. Here's the exact order we check things on every no-heat call across Nash and Edgecombe counties.
Before diagnosing internal components, rule out the vent duct. A blocked duct causes roughly 40% of thermal fuse failures and is a genuine fire hazard.
The disconnect test: Disconnect the dryer exhaust duct. Run the dryer on heat for 5 minutes. If it heats normally with the duct removed, your duct is blocked.
Critical: Replacing a thermal fuse without clearing the duct that caused it to blow means the new fuse will blow again.
The thermal fuse is a one-time safety device that breaks permanently when exhaust temperature exceeds a safe threshold. It cannot be reset — it must be replaced.
How to test it: Unplug the dryer. Disconnect the fuse wiring. Test continuity with a multimeter. No beep means the fuse has blown.
The heating element is a coiled resistance wire. When the wire breaks, it produces no heat. About 60% of failed elements show visible damage on inspection.
Electrical test: With the dryer unplugged, test the element terminals for continuity. No continuity confirms failure.
Gas dryers use a glow-bar igniter to light the burner. As it weakens with age, it takes longer to reach ignition temperature, eventually failing to trigger the gas valve at all.
How to identify it: Start the dryer. Look at the burner assembly within 60-90 seconds. Glowing but no ignition means the igniter is weak or the valve coils have failed.
The coil pack — two or three solenoid coils — opens the gas valve. When a coil fails, the valve can't open even if the igniter glows hot. We replace the full coil pack whenever one coil fails, since the others are at the same wear point.
The cycling thermostat regulates operating temperature. When it fails, it causes either no heat or overheating that trips the thermal cutoff. We replace it alongside the thermal fuse whenever overheating (not duct blockage) was the root cause.
If your dryer is more than 3 years old and has never had duct cleaning, schedule one. The NFPA attributes roughly 34% of dryer fires to failure to clean vents.
What duct cleaning involves: A rotating brush clears the full duct run, with inspection for kinks, crushed sections, and improper materials.
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