If you’re facing the issue of a dryer won’t shut off, you’re not alone. Many homeowners experience this problem at some point with their dryers. It can be frustrating to deal with, especially if you’re not sure what’s causing the issue. There are several reasons why a dryer won’t stop running even after the cycle is complete. In this article, we will discuss some of the most common causes of this problem.

Malfunctioning Timer

A malfunctioning timer is often responsible for causing a dryer to continuously run beyond its intended cycle. The timer is an essential component of the dryer that controls the duration of the drying cycle. If the timer is not functioning correctly, it can lead to the dryer continuing to run even after the cycle has completed.

To diagnose the issue, one can perform a simple test by setting the dryer to a timed dry cycle and observing whether it shuts off once the timer runs out. If the dryer does not stop running, it indicates a potential problem with the timer.

Broken Door Switch

A broken door switch is another common issue that can cause a dryer to continuously run without shutting off. . If the door switch is broken or not functioning correctly, it can cause the dryer to run regardless of whether the door is open or closed.

To diagnose the issue, one can perform a simple test by opening and closing the door while the dryer is running. If the dryer continues to run, it indicates a possible problem with the door switch.

Stuck Start Button

A stuck start button is a possible reason for a dryer that fails to shut off after the cycle is complete. If the start button is stuck in the “on” position, it can cause the dryer to continue running beyond the set time.

To identify the issue, one can try pressing and releasing the start button several times. If the button fails to pop back out or the dryer continues to run, it may indicate a problem with the start button.

Enabled Wrinkle Prevent Feature

The “wrinkle prevent” feature, available in some dryers, is designed to keep the dryer tumbling after the cycle is complete to prevent wrinkles from forming in clothes. However, if this feature is enabled, it can cause the dryer to continue running beyond its intended cycle.

To diagnose the issue, one can try turning off the “wrinkle prevent” feature and see if the dryer shuts off after the cycle is complete. If the dryer stops running, it indicates that the “wrinkle prevent” feature was the problem.

Faulty Cycling or Cool Down Thermostat

A faulty cycling or cool down thermostat can also lead to a dryer continuously running even after the cycle is complete. The cycling or cool down thermostat is responsible for regulating the temperature in the dryer, and if it is not functioning correctly, it can cause the dryer to keep running beyond the set time.

To identify if the thermostat is causing the issue, one can run the dryer on a low heat cycle and observe if it shuts off once the cycle is complete. If the dryer does not stop running, it indicates a possible problem with the cycling or cool down thermostat.

Stuck Motor Relay

Possible diagnostic steps for a stuck motor relay in a dryer:

  1. Unplug the dryer from the power source to ensure safety.
  2. Locate the motor relay, which is usually located on the control board or near the motor.
  3. Inspect the relay for any visible signs of damage, such as burnt or corroded contacts, cracked casing, or loose wires.
  4. Use a multimeter to test the continuity of the relay’s contacts. If the contacts do not open and close properly when voltage is applied, the relay may be stuck in the “on” position.
  5. Check the wiring connections between the relay and the control board or other components to ensure they are secure and not corroded.

Defective Control Board

The following are some possible diagnostic steps for a faulty control board in a dryer:

  1. For safety purposes, disconnect the dryer from the power source.
  2. Find the control board, which is usually located behind the control panel on the top or front of the dryer.
  3. Examine the control board for any visible indications of damage, such as burnt or swollen components, loose wires, or corroded connections.
  4. Test the voltage and continuity of the control board’s circuits using a multimeter. Follow the manufacturer’s specifications to determine if the readings fall within the acceptable range.
  5. Check the wiring connections between the control board and other components, such as the timer, thermostat, and motor relay, to make sure they are secure and not corroded.
  6. Verify that the user interface board, which is responsible for the dryer’s display and control buttons, is functioning correctly. A faulty user interface board can also lead to dryer malfunctions.

Solutions for a Dryer That Won’t Shut Off Automatically

Now that you’ve identified some of the most common causes of a dryer that won’t shut off, it’s time to explore some potential solutions. Keep in mind that some of these solutions may require the help of a professional appliance repair service.

Replace a Broken Door Switch

When dealing with a malfunctioning door switch, replacing it by yourself is a viable solution that can be accomplished with the help of some essential tools. Follow these detailed steps for an effective and safe door switch replacement process:

  • Safety First: Always start by unplugging the dryer to avoid any electrical hazards during the procedure.
  • Locating the Door Switch: Carefully inspect your dryer’s door and locate the door switch, typically found near the door frame.
  • Gathering Tools: Equip yourself with the necessary basic tools, such as a screwdriver, needle-nose pliers, or a multimeter, depending on your dryer model and door switch design.
  • Removing the Broken Switch: Unscrew or unclip the door switch from its position, and cautiously disconnect the wires attached to it. Take note of the wire connections for proper reinstallation.
  • Preparing the New Switch: Acquire a replacement door switch compatible with your dryer model, ensuring it is identical to the broken one in terms of specifications and design.
  • Connecting the Wires: Attach the wires to the new door switch, following the same connections as the previous switch. Use your notes or reference pictures if necessary.
  • Installing the New Switch: Secure the new door switch in the same position as the old one, using screws or clips as needed. Ensure it is properly aligned with the door and its components.
  • Final Checks: Double-check all connections and the switch position to confirm everything is correctly installed.
  • Powering Up: Plug the dryer back in and test its functionality by opening and closing the door. The dryer should now operate seamlessly, indicating the problem has been resolved.

By following these comprehensive steps, you can efficiently replace a broken door switch and restore your dryer’s functionality with minimal effort.

Replace the Dryer’s Timer

If you suspect that the timer is causing issues with your dryer, replacing it may be necessary. Though this repair can be more complex, with careful attention and the right tools, it is possible to accomplish it yourself. Follow these steps to replace your dryer’s timer effectively and safely:

  • Safety First: Unplug the dryer from the power source to avoid any potential electrical hazards during the repair process.
  • Gather Tools: Assemble the necessary tools, such as a screwdriver, needle-nose pliers, and a multimeter, depending on your dryer model and timer design.
  • Access the Timer: Carefully remove the back panel of the dryer, which may require unscrewing or unclipping it, depending on your specific model. Locate the timer, typically situated near the control panel or the back of the dryer.
  • Document the Wiring: Before disconnecting any wires, take clear pictures or make notes on the connections to ensure proper reinstallation.
  • Disconnect the Old Timer: Carefully remove the wires connected to the old timer, using needle-nose pliers if necessary. Then, unscrew or unclip the timer from its position.
  • Acquire a Compatible Replacement: Purchase a new timer that is compatible with your dryer model, ensuring it has the same specifications and design as the faulty one.
  • Install the New Timer: Secure the new timer in the same position as the old one, using screws or clips as needed. Attach the wires to the new timer according to the reference pictures or notes taken earlier.
  • Reassemble the Dryer: Reattach the back panel, ensuring all components are properly aligned and secure.
  • Perform a Test Run: Plug the dryer back in and test its functionality. If the timer has been replaced correctly, the dryer should now operate as expected, indicating the problem has been resolved.

Replace a Faulty Cycling or Cool Down Thermostat

The cycling or cool down thermostat in your dryer is responsible for regulating the temperature during the drying cycle. If this thermostat is faulty, it can result in issues such as overheating or inadequate drying. Here are some steps to replace a faulty cycling or cool down thermostat:

  1. Turn off the dryer and unplug it from the electrical outlet.
  2. Locate the faulty thermostat, which is typically found on the blower housing or exhaust duct.
  3. Use a multimeter to test the thermostat for continuity. Set the multimeter to the ohms setting and touch the probes to each end of the thermostat.
  4. If the thermostat does not show continuity, it’s faulty and needs to be replaced.
  5. Purchase a replacement thermostat that is compatible with your dryer model.
  6. Remove the wires from the old thermostat and attach them to the new one. Make sure to attach each wire to the corresponding terminal on the new thermostat.
  7. Attach the new thermostat to the dryer in the same location as the old one.
  8. Plug the dryer back into the electrical outlet and turn it on to test for proper operation.

Replacing a faulty cycling or cool down thermostat requires basic electrical knowledge and should only be attempted by those who are comfortable working with electricity. If you’re not experienced in electrical repairs, it’s best to consult a professional.

Inspect for Visible Damage or Burnt Components

The control board in your dryer is responsible for controlling various functions, such as the drying cycle, temperature regulation, and time settings. If the control board is faulty, it can result in issues such as improper functioning or power failure. Here are some steps to inspect the control board for visible damage or burnt components:

  1. Turn off the dryer and unplug it from the electrical outlet.
  2. Locate the control board, which is typically found on the back of the dryer.
  3. Remove the control board from the dryer according to the manufacturer’s instructions.
  4. Inspect the control board for any signs of damage or burnt components, such as discoloration, burn marks, or melted plastic.
  5. If you see any visible damage or burnt components, the control board will need to be replaced.
  6. Purchase a replacement control board that is compatible with your dryer model.
  7. Install the new control board in the same location as the old one.
  8. Reconnect any wires or cables that were disconnected during the removal process.
  9. Plug the dryer back into the electrical outlet and turn it on to test for proper operation.

Inspecting the control board for visible damage or burnt components requires some basic electrical knowledge and should only be attempted by those who are comfortable working with electricity. If you’re not experienced in electrical repairs, it’s best to consult a professional.

A dryer that won’t shut off automatically can be a frustrating problem to deal with. However, by identifying the common causes and potential solutions, you can take steps to resolve the issue. Remember to always unplug the dryer before attempting any repairs, and if you’re not comfortable working with electricity, seek the help of a professional appliance repair service. By following these tips, you can get your dryer back up and running in no time.

Updated at: August 22, 2023