Samsung front-load washer: field service manual

Start: the board checks the door switch, energizes the door lock and confirms it latched before any water enters. If the lock does not confirm, the cycle stops with a door code (dC/dE family).

Fill: one or more solenoids on the inlet valve open and route water through the detergent drawer. The board reads tub level from a pressure (water-level) sensor connected to the tub by a small air hose and stops filling at the target level. No water rise within the time limit gives a fill code (4C/4E/nF).

Wash: the drum is tumbled in alternating directions at low speed. On heater models a heater under the drum and a temperature sensor hold the set temperature.

Drain: the drain pump at the front-bottom runs, pulling water through a coin/lint filter behind the lower-front access cover. If level does not fall in the time limit the board shows a drain code (5C/5E/nd).

Load and balance sensing: before high-speed spin the board ramps the drum slowly and watches motor current and speed ripple from the hall sensor to judge load size and imbalance. It redistributes and retries; repeated failure ends with an unbalance code (UE/Ub) and a low-speed or no-spin finish.

Spin: the drum ramps to the selected speed while the pump keeps running. Many models also use a vibration (MEMS) sensor; a sensor fault shows as 8E/8C.

Door release: the lock is held until the drum stops and no water is detected above the door line, then released. A drum still turning or water left in the tub keeps the door locked.