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Dryer drum spins normally but produces no heat on any temperature setting — thermostat outer terminals have failed open, blocking voltage to the heating element or burner assembly.
Dryer runs excessively hot, scorches clothes, or keeps blowing the thermal fuse — defective cycling thermostat fails to cut power to the heating element at the correct temperature.
Clothes require multiple cycles to dry — a weak bias heater causes the thermostat to cycle the heat off prematurely, preventing the drum from reaching optimal drying temperature.
Dryer continues running past the set time or fails to advance to the cooldown segment on automatic cycles — faulty thermostat signal prevents the timer from receiving the correct temperature feedback.
💡 Pro Tip: How to Know If Your Cycling Thermostat Has Failed
Your part is likely the culprit if you notice any of the following:
⚠️ Dryer runs but produces no heat on any temperature setting
⚠️ Drum gets excessively hot and repeatedly blows the thermal fuse
⚠️ Clothes take two or more cycles to dry — heat shuts off too early
⚠️ Dryer won't stop running or fails to advance past the cooldown on Auto cycles
Tech tip: Remove the thermostat and test the two outer terminals with a multimeter — you should read 0 Ω (continuity) at room temperature. Then test the two inner small terminals; a healthy bias heater reads approximately 4,500 Ω. If the outer terminals show no continuity, or the inner terminals read open, replace the thermostat. Always replace the thermal fuse at the same time — a blown fuse is usually a symptom of a failing cycling thermostat.
📦 What's in the Box
✅ 1× Dryer Cycling Thermostat 3387134 (L155-25, 4-terminal, internal bias heater, 120V / 2W, 2" × 1.5", black/silver)
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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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