The Dryer Timer Knob is an OEM part for Frigidaire dryers. It attaches to the timer shaft on the control panel and allows users to select and set the desired drying cycle. This knob is essential for starting the dryer and adjusting the drying time and settings. Causes of a bad timer knob can include regular wear and tear, excessive force when turning the knob, or accidental impacts that can crack or break the knob. Symptoms of a bad dryer timer knob include: Difficulty turning the knob or selecting cycles The knob becoming loose or falling off Cracks or visible damage to the knob The dryer not starting or changing cycles when the knob is turned This OEM replacement is also compatible with Electrolux, Gibson, Kelvinator, and Kenmore models.This part fixes the following symptomsTimer will not advancePart Number 131873500 (AP2107778) replaces 131947300, 134042600, 832670, AH418921, EA418921, PS418921.