Dryer Won't Start — Power & Switch Checks First
A dryer that won't start at all (no hum, no tumble, no lights) is usually electrical: power supply, door switch, thermal fuse, or the start switch itself. Most of these are quick to diagnose and several are DIY-fixable.
BHGS Licensed #50446 · Same-day service · $60 diagnostic credited toward repair · Updated June 2026
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Common Causes
1. Door switch / door not fully latched
The dryer won't start unless the door switch confirms the door is shut. The plastic strike or the switch itself wears out, so the dryer thinks the door is open even when closed.
2. Blown thermal fuse
On many dryers a blown thermal fuse kills all function, not just heat. The fuse blows from a clogged vent overheating the dryer — so replacing the fuse without cleaning the vent just repeats the failure.
3. Power supply — tripped breaker or one leg of 240V
Electric dryers use 240V (two 120V legs). If one leg trips, the dryer may have lights but no motor, or be completely dead. A fully tripped breaker = nothing at all.
4. Failed start switch or push-to-start button
The start button mechanism wears out. You press it and nothing happens — no hum. Common on older dryers with mechanical timers.
5. Broken belt switch / motor failure
Some dryers have a belt switch that cuts power if the belt snaps. A failed motor also presents as "won't start" — sometimes with a hum but no tumble.
What You Can Check Yourself
Try these in order — most take 5-10 minutes and many resolve the problem without a service call.
- 1
Check power at the breaker
Find the dryer breaker in your panel. Flip it fully OFF, then back ON (a tripped breaker can look "on" but be mid-position). For gas dryers, also confirm the 120V outlet has power — plug in a phone charger.
- 2
Slam the door firmly
Open and close the door hard enough to hear a solid click. Try starting. If it now starts, the door switch is marginal — note it for replacement before it fails completely.
- 3
Listen when you press Start
Press and hold Start. Total silence = power, door switch, thermal fuse, or start switch. A hum with no tumble = belt or motor. This split tells the tech where to look.
- 4
Check for a clogged vent (thermal fuse context)
If the dryer was drying slowly or running hot before it died, a clogged vent likely blew the thermal fuse. Clean the vent end-to-end — the fuse replacement won't last otherwise.
- 5
Look for error codes / reset
Modern dryers: unplug for 5 minutes to reset the control board, then try again. Check the display for fault codes and look them up for your model.
When to Call a Pro
- →Breaker is on, door latches, but dryer is still completely dead
- →You hear a hum but the drum will not turn (belt or motor)
- →Thermal fuse is blown — needs replacement AND vent cleaning together
- →Burning smell or scorched outlet — stop and call, this is an electrical hazard
Typical cost
$60 diagnostic. Door switch / start switch $120–$180. Thermal fuse + vent service $150–$220. Motor $250–$380.
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