If your Whirlpool dryer tumbles but does not heat, start by checking the lint screen and exterior vent. Restricted airflow can overheat the dryer and trigger safety components, leaving clothes damp after a full cycle.
Electric Whirlpool dryers may have a failed heating element, thermal fuse, high-limit thermostat, timer contact, or control issue. Gas models can also have igniter, flame sensor, gas valve coil, or burner assembly problems.
Stop using the dryer if you smell burning, the cabinet gets unusually hot, or cycles take much longer than normal. A technician can test the heating circuit, airflow, thermostats, and safety devices before replacing parts.