The heating element warms the air before it enters the dryer drum. Over time, the heating element can burn out, causing the dryer not to heat. 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.
Incoming Power Problem
If your dryer is not heating, then you may have an incoming power problem. Electric dryers need two legs of 120 volts AC equaling 240 volts. It is not uncommon for only one fuse or breaker to trip resulting in the dryer able to run, but not heat. The fuse box or circuit breaker should be checked or voltage measured at the outlet using a multi-meter.
High Limit Thermostat
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 doesn’t heat, the timer might be defective. However, this is very rarely the case. Before replacing the timer, check all the more commonly defective parts. If you determine that all of the other components are working properly, test the timer by using a multimeter and consulting the wiring diagram. If the timer is defective, replace it.
iFixit Staff Suggestion: For additional information you can go to Electric Dryer Not Heating which addresses a few other causes as well. —Bill Gilbert