Dryer Won't Stop: Common Causes and How to Fix It

A dryer that will not stop can waste energy and leave clothes over-dried or damaged from continuous heat exposure. When the dryer continues running past the selected cycle time, fails to shut off, or keeps running even after the door is opened, the issue is often linked to the timer, door switch, or control board.

Before replacing parts, confirm the cycle selection and door switch are functioning correctly. If the problem continues, the following are the most common causes of a dryer that will not stop and the recommended solutions.

1. Dryer Timer Assembly

Most Common Solution

Why It Causes the Dryer Not to Stop

The timer assembly controls how long each part of the drying cycle runs. If the timer sticks or fails, the dryer may continue running past the selected cycle time.

Common causes include:

  • Worn timer motor
  • Stuck timer contacts
  • Failed timer motor

Symptoms include:

  • Dryer keeps running after the buzzer sounds
  • Cycle never advances to off
  • Timer dial does not move

How to Replace a Dryer Timer

  1. Disconnect power to the dryer.
  2. Remove the control panel.
  3. Disconnect the timer wiring.
  4. Remove the mounting screws.
  5. Remove the old timer.
  6. Install the replacement timer.
  7. Reconnect the wiring.
  8. Test the dryer cycle.

2. Dryer Door Switch

Why It Causes the Dryer Not to Stop

The door switch signals the control system when the door is opened or closed. If the switch sticks or fails, the dryer may continue running even when the door is opened.

Common causes include:

  • Stuck switch plunger
  • Worn contacts
  • Wiring short

Symptoms include:

  • Dryer keeps running with the door open
  • No response when the door is opened
  • Buzzer sounds but drum keeps turning

How to Replace a Dryer Door Switch

  1. Disconnect power to the dryer.
  2. Open the dryer door.
  3. Locate the door switch near the door frame.
  4. Remove the mounting screws.
  5. Disconnect the wiring connector.
  6. Remove the old switch.
  7. Install the replacement switch.
  8. Reconnect the wiring.
  9. Test the door and dryer operation.

3. Dryer Control Board

Why It Causes the Dryer Not to Stop

The control board manages cycle timing and the stop signal. A malfunctioning board can keep the drum or heater running past the intended cycle length.

Common causes include:

  • Electrical surge damage
  • Failed relay
  • Worn components

Symptoms include:

  • Dryer will not stop when selected
  • Buttons become unresponsive
  • Erratic cycle behavior

How to Replace a Dryer Control Board

  1. Disconnect power to the dryer.
  2. Access the control board, usually behind the console.
  3. Take a photo of wiring connections.
  4. Disconnect wiring from the old board.
  5. Remove mounting screws.
  6. Install the replacement control board.
  7. Reconnect all wires correctly.
  8. Test dryer operation.

4. Dryer Moisture Sensor

Why It Causes the Dryer Not to Stop

Automatic and sensor dry cycles rely on a moisture sensor to determine when clothes are dry. If the sensor is dirty or fails, the dryer may run for the full extended time regardless of actual dryness.

Common causes include:

  • Dirty sensor strips
  • Failed sensor
  • Wiring issue

Symptoms include:

  • Dryer runs the full extended time regardless of dryness
  • Clothes come out over-dried
  • Sensor dry cycle does not end on its own

How to Clean or Replace a Dryer Moisture Sensor

  1. Disconnect power to the dryer.
  2. Open the dryer door.
  3. Locate the sensor strips inside the drum.
  4. Clean the strips with rubbing alcohol.
  5. If the sensor still fails, access the wiring behind the drum.
  6. Disconnect the sensor wiring.
  7. Remove the old sensor.
  8. Install the replacement sensor.
  9. Reconnect the wiring.
  10. Test the sensor dry cycle.

Preventing Dryer Stop Problems

To help prevent your dryer from failing to stop:

  • Use the correct cycle selection for the load.
  • Clean moisture sensor strips regularly.
  • Avoid overloading the dryer.
  • Check the door switch periodically.
  • Address error codes early.
  • Schedule periodic maintenance.

Find the Correct Dryer Replacement Part

A dryer that will not stop is commonly caused by a faulty timer, a failing door switch, a malfunctioning control board, or a dirty or failed moisture sensor.

Always verify your dryer model number before ordering replacement parts to ensure the correct fit and compatibility.

At Authentic Appliance Parts, we provide quality dryer replacement parts and repair resources to help you diagnose dryer problems and complete repairs with confidence.