Dryer Won't Turn Off Automatically (Troubleshooting Guide)

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Quick answer
Confirm the symptom
Tools and prep
Step-by-step troubleshooting
Common causes table
Parts matching
When to call a pro
FAQ
Related guides

Quick answer

If your dryer won't turn off automatically, check the moisture sensor and timer. Clean the lint trap and vent, then test the dryer. If it still runs, the timer or sensor might need replacing.

Confirm the symptom

Dryer runs past the set time or cycle
Cycle doesn't end even after clothes are dry
Timer doesn't advance or reset properly
No error codes but dryer keeps running

Tools and prep

Screwdriver (flathead and Phillips)
Multimeter (for testing continuity)
Lint brush or vacuum
Replacement parts (timer, moisture sensor)
Work gloves and safety glasses
User manual for your dryer model

Step-by-step troubleshooting

Unplug the Dryer
Do: Disconnect the dryer from the power source to ensure safety.
Observe: Dryer is completely powered down.
Means: Prevents electrical hazards during inspection.
Next: Inspect the lint trap and vent
Inspect the Lint Trap and Vent
Do: Clean the lint trap and use a vacuum to remove debris from the vent duct.
Observe: No blockage in the lint trap or vent.
Means: Improves airflow and ensures accurate sensor readings.
Next: Check the moisture sensor
Check the Moisture Sensor
Do: Locate the moisture sensor (usually on the back of the lint trap) and clean it with a dry cloth.
Observe: Sensor contacts are clean and free of lint or residue.
Means: A dirty sensor can prevent the dryer from detecting dryness.
Next: Test the dryer on a short cycle
Test the Dryer on a Short Cycle
Do: Plug in the dryer and run a short timed cycle (10-15 minutes) with a load of dry clothes.
Observe: Dryer shuts off automatically at the end of the cycle.
Means: The dryer functions correctly if the issue was lint or sensor-related.
Next: Check the timer mechanism
Check the Timer Mechanism
Do: Open the dryer's control panel and inspect the timer for signs of wear or damage. Use a multimeter to test for continuity.
Observe: Timer shows no continuity or has visible damage.
Means: A faulty timer can prevent the dryer from advancing through cycles.
Next: Replace the timer if necessary
Replace the Timer if Necessary
Do: Purchase a replacement timer compatible with your dryer model and install it according to the manual.
Observe: Dryer cycles through settings and shuts off properly.
Means: A new timer resolves issues with the dryer not turning off.
Next: Final test

Common causes

Cause	Likelihood	Difficulty	Part often needed
Dirty Moisture Sensor Lint or debris on the sensor prevents it from detecting dryness.	Common	Easy	Moisture sensor cleaning kit
Faulty Timer A worn or damaged timer can fail to advance or shut off the dryer.	Common	Medium	Dryer timer
Blocked Lint Trap or Vent Restricted airflow can cause the dryer to run longer to dry clothes.	Common	Easy	Lint trap or vent cleaning tools
Defective Dryer Cycle Selector A malfunctioning selector may not engage the correct cycle or shut off.	Sometimes	Medium	Cycle selector switch
Wiring Issues Loose or damaged wires can disrupt the dryer's electrical signals.	Rare	Hard	Electrical repair kit
Control Board Malfunction A faulty control board can fail to send shutdown signals to the dryer.	Rare	Hard	Dryer control board

Parts matching

Match your dryer model to the correct replacement parts:

Dryer model number (check inside the door or manual)
Type of timer (mechanical or electronic)
Moisture sensor compatibility
Control board specifications
Voltage and amperage requirements

Purchase OEM parts for the best fit and performance.

When to call a professional

The dryer still won't shut off after replacing the timer and cleaning the sensor
You detect a burning smell or sparks during operation
You're uncomfortable working with electrical components
The dryer is under warranty and you don't want to void it
You can't locate the correct replacement parts for your model

FAQ

Can a clogged vent cause the dryer to run too long?

Yes, a blocked vent restricts airflow, making the dryer work harder and run longer to dry clothes. Always clean the vent regularly.

How do I know if the moisture sensor is faulty?

If the dryer runs past the dry point even with a clean sensor, it may be defective. Test it with a multimeter for continuity.

Is it safe to replace the timer myself?

Yes, if you follow the manual and take proper safety precautions. Unplug the dryer before starting and double-check connections.

Why does my dryer shut off immediately after starting?

This could indicate a short in the wiring or a faulty control board. Inspect the wiring and test the control board for continuity.

Can a bad thermostat cause the dryer to run too long?

A faulty thermostat can prevent the dryer from detecting heat levels, but it's less likely to cause the dryer to run indefinitely. Check the timer and sensor first.