Why won't the washing machine door open or lock?

Replace the washer door lock assembly

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.

Replace the washer main control board

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.

Repair or replace the washer drain pump

The drain pump removes water from the washer at the appropriate times during the wash cycle. The pump's bearing can seize, the seal can fail or the impeller blades can break. The belt on a belt-driven pumps can break, and the pulley can shear off. A humming noise when the washer is full of water is a common symptom of a failing pump. In some cases, you can repair the pump by clearing it of debris, fixing wiring failures or replacing a seal. If the pump can't be repaired or rebuilt, replace it.

Replace the washer water-level pressure switch

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.