The Hi-Limit Thermostat is an OEM part for Whirlpool dryers. It functions as a critical safety device that monitors and controls the temperature within the dryer, preventing it from overheating. When the dryer reaches a temperature that is too high, this thermostat will cut off the power to the heating element to mitigate the risk of fire. Symptoms of a bad Hi-Limit Thermostat include: Dryer not heating adequately or at all Clothes taking longer than usual to dry The dryer repeatedly shutting off during a cycle Excessive heat emitted from the dryer even on lower settings Causes of a bad Hi-Limit Thermostat can include a malfunction due to electrical issues, lint buildup causing restricted airflow and increased temperature, or failure of other components like the cycling thermostat that can cause the dryer to overheat. This OEM part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.Part Number WP3977767 (AP6009043) replaces 3977767, 3399693, 898078, ER3977767, PS11742185, SET185, TJ90SET185, WP3977767VP.