A standard clothes dryer cannot run if its door switch is broken or malfunctioning, because the door switch serves as an essential primary safety interlock mechanism. When you open a dryer door, the spring-loaded or push-button door switch physically opens the electrical circuit, cutting off power to the heating element and stopping the drive motor to prevent accidental injury from spinning drum contents. If the door switch fails in the open position, the control board will not allow the dryer to start when you press the start button. While some DIYers attempt to test the dryer by manually bypassing the switch with a jumper wire, operating a dryer with a permanently bypassed door switch is extremely dangerous and a severe fire hazard.
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