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Dryer drum spins normally but produces no heat. The blown thermal fuse has opened the heating circuit, stopping all heat output.
Dryer will not start at all after an overheating event. A failed thermal cut-off fuse can interrupt the power circuit entirely on some models.
Dryer starts and heats briefly, then shuts off before the cycle completes. Indicates the fuse may be marginal or a secondary overheat condition keeps tripping it.
Clothes remain damp after a full cycle. A partially degraded fuse or blocked vent reduces heat output below drying threshold.
If the high-limit thermostat companion component (3390291 / 3977767) fails, the dryer overheats repeatedly, blowing the thermal fuse. Replace both components together.
💡 Pro Tip: How to Know If Your Thermal Fuse Has Blown
Your part is likely the culprit if you notice any of the following:
⚠️ Dryer runs but produces no heat or not enough heat
⚠️ Clothes take much longer than normal to dry
⚠️ Dryer shuts off too soon mid-cycle
⚠️ Dryer will not start at all after overheating event
Test the fuse with a multimeter set to continuity. At room temperature a good fuse reads zero (continuity); a blown fuse reads infinity (open circuit) and must be replaced. Also check and clear any lint or vent restrictions before installing the new fuse — a blocked exhaust is the #1 cause of repeat fuse failure.
📦 What's in the Box
✅ 1× 3977393 Thermal Cut-Off Fuse (309/325°F, ceramic/metal, L309F one-time fuse)
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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