Why won’t my dryer stop running? Causes and fixes
A dryer that won’t stop running is most often caused by a dirty or failed moisture sensor keeping auto-dry cycles alive, a timer or control board with a stuck relay, or a faulty door switch. A dryer that keeps tumbling after the door opens should be unplugged and repaired promptly - that defeats a core safety interlock. Identify your dryer’s model number to order the correct replacement parts.
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Safety information
Unplug the dryer before testing the door switch, timer, thermostat, or control board. A dryer that continues tumbling with the door open must not be used until the door switch is replaced. If a dryer that won’t stop is also running hot, treat it as an overheating fault and diagnose the thermostat before returning it to service.
Most common causes
- Dirty or failed moisture sensor — residue-coated sensor bars read clothes as perpetually damp, so auto-dry cycles never conclude; the most common cause.
- Failed timer — on mechanical dryers, worn timer contacts or a dead timer motor stop the dial from advancing, so the cycle never ends.
- Stuck control board relay — on electronic dryers, a welded motor relay keeps the drum turning regardless of cycle state.
- Faulty door switch — a shorted switch keeps the motor circuit closed, so the drum keeps spinning with the door open.
- Failed cycling thermostat on auto cycles — timers on many auto-dry designs only advance when the thermostat cycles; a thermostat stuck closed stalls the countdown.
- Cool-down behavior mistaken for a fault — many dryers tumble without heat for several minutes at cycle end, and wrinkle-guard options tumble intermittently for up to hours by design.
Step-by-step diagnosis
- Rule out wrinkle guard and cool-down first. Check whether a wrinkle-prevent or extended-tumble option is enabled - these tumble the drum intermittently long after the cycle ends by design - and remember the last several minutes of any cycle run unheated as cool-down.
- Test a timed cycle versus an auto-dry cycle. If timed cycles end normally but auto cycles run forever, the moisture-sensing side is the fault - sensor or its circuit. If nothing ever ends, look at the timer, control, or door switch.
- Clean the moisture sensor bars - the two metal strips inside the drum lip or on the lint housing. Wipe them firmly with rubbing alcohol to strip fabric-softener film, then run an auto cycle with a damp (not soaked) load and confirm it terminates.
- Check the door switch. Open the door mid-cycle: the drum must stop immediately. If it keeps spinning, unplug the dryer and replace the door switch before anything else - a dryer that runs with the door open is an entrapment and injury hazard.
- Test the timer on mechanical models. Watch whether the dial advances during a timed cycle; a dial that never moves means the timer motor has died or its contacts are stuck. On auto-dry settings, a timer that only stalls there usually implicates the cycling thermostat instead.
- Test the cycling thermostat if auto-dry cycles stall on a mechanical dryer. Many designs advance the timer only while the thermostat is open; a thermostat stuck closed keeps heat on and the timer frozen. Check continuity behavior with heat, and replace a thermostat that never opens.
- Evaluate the control board on electronic dryers last. If the sensor is clean, the door switch works, and cycles still never terminate - or the drum runs the moment the dryer is plugged in - a welded relay on the board is holding the motor circuit closed. Replace the board.
Replacement parts to consider
Common parts for a dryer that won’t stop: moisture sensor, timer, control board, door switch, cycling thermostat. Enter your dryer’s model number on reliableparts.com for the exact parts for your specific model.
Related FAQs
Why does my dryer keep running after the clothes are dry?
On auto-dry cycles the dryer stops when the moisture sensor says the load is dry - and sensor bars coated in fabric-softener film read damp forever. Wipe the two metal bars inside the drum with rubbing alcohol first; it’s the most common fix. Timed cycles ending normally confirms the diagnosis.
Why does my dryer keep spinning with the door open?
That’s a failed door switch, and it’s worth fixing immediately - the switch exists so the drum stops the instant the door opens. A shorted switch keeps the motor circuit closed. Unplug the dryer, test the switch for continuity that persists when released, and replace it before using the dryer again.
Is it normal for my dryer to tumble after the cycle ends?
Often yes. Cool-down runs the last minutes of every cycle without heat, and wrinkle-guard or extended-tumble options intentionally rotate the drum on and off for up to a few hours to prevent wrinkles. Check the option buttons before diagnosing - turning wrinkle guard off is frequently the entire fix.
Why won’t my dryer’s timer advance?
On timed cycles, a frozen dial means the timer motor or contacts have failed - replace the timer. On auto-dry cycles, many mechanical dryers only advance the timer while the cycling thermostat is open, so a thermostat stuck closed (or a load that never registers dry) stalls the dial even with a good timer.
Does a dryer shut off by itself if it overheats?
Dryers carry a high-limit thermostat and a thermal fuse that cut heat or power in an overheat event, but those protect against excess temperature - not against a control fault that simply keeps the drum turning. Don’t rely on safety devices as a shutoff; repair a dryer that won’t terminate cycles.
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