When a clothes dryer runs and tumbles the drum normally but blows completely cold air instead of heat, the malfunction is typically caused by a burned-out heating element, a tripped thermal cut-off fuse, a faulty cycling thermostat, or a blocked exterior exhaust vent. In electric dryers, the metal heating element coil can snap or develop a break. In gas dryers, an igniter failure or gas valve solenoid defect prevents the burner from lighting. You can troubleshoot heating circuits safely using a multimeter. You can verify that your corrective action is successful when replacing a snapped heating element, resetting tripped thermal fuses, or clearing exhaust duct blockages allows the dryer to blow hot air and dry clothes efficiently.
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