Washer: Why won't my washing machine start?

The door lock assembly on a front-load washer includes a safety switch that detects whether the washer door is closed, a latch and a locking mechanism. If any of these components fails when the door is open, the door won't lock; if a component fails with the door is closed, the door won't open. Replace the entire assembly if any component fails.

The main electronic control board, also called the mother board, governs the timing and execution of the washer component functions. It controls the fill valves, the drive motor and the drain pump.

The lid switch on a top-load washer is a safety switch that detects whether the washer lid is closed. The lid must be closed when the basket spins; if the washer incorrectly senses that the lid is open, it won’t spin and drain after the wash cycle.

Some top-load models require that the washer lid be closed before the washer drive motor runs. An open lid prevents some top-load washers from filling.

If the lid switch isn't detecting whether the lid is closed, replace the switch.

The motor control board is a circuit-control board in a front-load washer that's usually in the bottom of the washer next to the drive motor. It monitors and controls the drive motor speed and direction for the tumble and spin actions during the cycle. If the motor doesn't run, the motor control board might need to be replaced.

The timer — also called a cycle selector — is the dial you use to set the cycle on a washing machine with mechanical controls. The timer makes the washer move through its cycles, from initial filling to final spin. Replace the timer if it doesn’t advance the washer through its cycles.

The user interface board holds the buttons you press to set up the wash cycle. Replace the user interface board if one or more of the buttons don't work.

The water inlet valve assembly is a set of water valves that control the flow of water into the washer. Replace the water valve assembly if the washer won't fill and start because a valve doesn't open, or if the washer overfills because the valve doesn't close.

The water-level pressure switch detects the water level in the wash tub. If the water-level pressure switch is defective, the washer won't fill properly. It could not fill at all or it could overfill even to the point of overflowing. If the pressure switch doesn't accurately detect and control the water level in the washer, replace it.