Clothes dryer with its vent duct in a small laundry closet

Generic photo: Introspectivedsgn · Pexels License

Dryer won't start

Separate 'dead' (no display) from 'display OK but no start'. Common causes are supply, door switch, thermal fuse (on designs where it is in the motor/control circuit), start switch, belt switch and the drive motor.

Cross-checked ~45 min moderateBrands: All

Before you start

Unplug before removing panels
Live voltage checks at the outlet are caution steps

Diagnostic steps

Unlock all 5 steps with expected values

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OnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.

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How to test a dryer thermal fuse

A thermal fuse is a one-time safety link that opens permanently when the exhaust gets too hot. It is a simple continuity test, but a blown fuse is a symptom: the real cause is almost always a restricted vent or a failed cycling thermostat.

5 steps ~20 mineasy

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How to test a high-limit thermostat (dryer and similar heaters)

A high-limit is a normally-closed bimetal switch that opens if the heater area overheats and closes again when it cools. A room-temperature continuity test catches the common "stuck open" failure, but it cannot prove the opening temperature is right.

5 steps ~20 mineasy

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How to test a dryer cycling (operating) thermostat

The cycling thermostat switches the heat on and off to hold the exhaust temperature. It should be closed when cold and open when hot. A stuck-closed unit overheats the dryer; a stuck-open unit gives no heat.

6 steps ~20 mineasy