The following causes that occur when the dryer does not heat up are listed from most likely to least likely.
Thermal fuse
The thermal fuse is a safety device designed to protect the dryer from overheating. The fuse is located on the blower housing or on the heat source of the dryer, such as the heating element on electric dryers or on the gas burner on gas models.
Gas valve solenoid
Gas dryers have two or more solenoid valve coils. Gas valve solenoids open the gas valve to allow gas to flow into the burner assembly. If the solenoid fails, the burner may operate intermittently. If the burner continues to shut off, the dryer does not heat up enough and may not stop.
Igniter
The electric igniter uses heat to ignite the gas in the burner assembly. If the igniter is not working, the gas will not ignite and the dryer will not heat.
Heating Element Assembly
The heating element assembly heats the air before it enters the drying drum. Over time, the heating element may burn out, resulting in the dryer not heating up.
Flame sensor
On a gas dryer, the flame sensor detects heat from the fire. If the flame sensor is not working, the dryer will not heat. Before checking the flame sensor, first, make sure that the igniter and fuse are not the cause of the malfunction.
Heating element
The heating element heats the air before it enters the dryer drum. Over time, the heating element can burn out. If the heating element does not work, the dryer will not heat.
Incoming power problem
If your dryer is not heating, you may have a problem with the incoming power. Often there is only one fuse going off, which causes the dryer to be able to run but not heat.
An incoming power problem
If your dryer is not heating, you may have a problem with the incoming power. Often there is only one fuse going off, which causes the dryer to be able to run but not heat.
Thermostat with cycle
A thermostat with a cycle turns the heat on and off periodically to regulate the temperature of the air. If the thermostat is defective, the dryer will not heat.
Main control board
The main control board may be defective.
Timer
If the dryer is not heating, the timer may be defective.
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