The High Limit Thermostat is an OEM replacement part for Whirlpool dryers. This safety device monitors internal dryer temperatures.   The high-limit thermostat automatically interrupts power if excessive heat builds up inside the dryer drum and ventilation area. It protects both the dryer and home from potential fire hazards caused by issues like lint buildup restricting airflow.  Causes of a bad high-limit thermostat typically include wear over many heat cycles. Without this critical safeguard functioning reliably, overheating dangers increase. Symptoms of a bad high-limit thermostat include: Dryer failing to heat or stop heating unexpectedly Repeated blowing of fuses or breaker trips   Smoky odors emitted from the dryer vent This OEM Whirlpool replacement is also compatible with some Maytag, Roper, and select Kenmore dryer models as well.Part Number WP3391912 (AP6008320) replaces 3391912, 526280, PS11741455.