The part(s) or condition(s) listed below for the symptom Dryer won't stop are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
If the vent is clogged or partially clogged, it will restrict the airflow through the dryer, substantially increasing the drying time. To ensure proper dryer performance, you should clean your dryer’s venting system at least once per year.
The blower wheel draws air through the dryer and pushes the air out the vent. Clumps of lint, socks, and small articles of clothing can escape the lint filter and get caught in the blower wheel. In addition, the blower wheel sleeve can wear out, allowing the blower wheel to wobble on the motor shaft. If the blower wheel is obstructed or defective, it may take too long to dry clothes. To determine if the blower wheel is working properly, remove the dryer vent and assess the strength of the air flow. If the air flow is weak, check the blower wheel for obstructions. If no obstructions are present, try rotating the blower wheel by hand. If the blower wheel wobbles as it turns, replace it.
The heating element warms the air before the air enters the dryer drum. Over time, the heating element can burn out. If the heating element isn’t working, the clothes will take substantially longer to dry. To determine if the heating element has burned out, use a multimeter to test it for continuity. If the heating element does not have continuity, replace it.
The lint filter might be clogged. Dryer sheets and fabric softener can leave a residue on the lint filter, reducing the air flow. If the lint filter is clogged, clean it.
The moisture sensor monitors the clothing’s moisture level and sends a signal to the control board when the clothes are dry. If the moisture sensor is malfunctioning, it could inaccurately report that the clothing is still moist, causing the dryer to keep running even though the clothes are dry. However, this is rarely the case. Before replacing the moisture sensor check all the more commonly defective parts. If you have determined that all of the other components are working properly, replace the moisture sensor.
Dryer moisture sensor bar. This moisture sensor monitors the clothing’s moisture level and sends a signal to the control board when the clothes are dry. If your moisture sensor is defective, the dryer may shut off too early or continue running for a while after the clothes are dry. Two required.
The high-limit thermostat monitors the dryer temperature and shuts off the burner if the dryer overheats. If the high-limit thermostat is malfunctioning, it may shut off the burner even if the dryer is not overheating. However, this is rarely the case. Before replacing the high limit thermostat check all the more commonly defective parts. If you have determined that all of the other components are working properly, test the thermostat by using a multimeter to test it for continuity. If the thermostat does not have continuity, replace it..
If the dryer won’t stop, the thermistor might be defective. Some dryers have a thermistor. The control board uses the thermistor to monitor the dryer temperature and cycle the heat on and off. If the thermistor is defective, it may turn off the heat too early, considerably lengthening the drying time. However, this is rarely the case.
Dryer thermistor. This thermistor should read approximately 11.9K Ohms of resistance at 70 degrees Fahrenheit (21’ Celsius). If the thermistor is defective, it may prolong or shorten the drying time or cause a fault code. A defective thermistor is not responsible for a dryer not heating.