Washer: Won't drain

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.

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; 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 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.

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 timer controls the component functions in the washer. Also called a cycle selector, the timer has a motor that advances the internal cams inside the timer body. The cams open and close electrical contacts to energize and de-energize components during the wash cycle. A control knob on the stem of the timer lets the user select cycles on the timer. If the timer motor does not advance or the contacts are defective in the timer, replace it.

The washer's drive motor provides the force to rotate the spin basket. It also drives the shaft of the gearcase to move the agitator in a top-load washer. It's either attached to a drive pulley with a belt or is directly attached to the drive shaft. If the motor windings fail or the bearings on the motor lock up, the motor won't run. Replace the drive motor if it's defective.

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.

A service technician does a regular preventive maintenance check, examining the washer for potential problems and testing the functions of the washer. The technician makes adjustments to maximize the efficiency and ensure smooth operation of the washer.