The last stage of a normal wash cycle is a spin to press most of the water out of the clothes. Modern washers have sensors (usually for weight) to measure when the intended amount of water has been removed from the clothes. If this takes longer than expected, it keeps running until it’s done.
Modern dryers have humidity sensors which check whether (nearly) all the moisture has been removed. Similarly, if this takes longer than expected, it keeps running until it’s done.
That last minute is the tail end of your spin and drain. The centrifugal force of spinning basically “wrings out” the water from your clothes while running the drain pump.
Modern washing machines (and dryers) are equipped with sensors to know how much water is in the machine. The models I service use an air pressure sensor, which senses pressure differences when water is added or drained from the tub. The timer is the process of the timed elements of the wash. Certain phases of the cycle end when a sensor tells it that the machine is clear for the next phase, which is not determined by the timer. If you pay attention during the whole cycle, the timer will skip around, mainly between phases of the cycle.
Source: am maintenance tech. Yes, I actually fix my residents issues. I also cut my paint around outlets and hinges.
Your experience may vary, but my washing machine started doing this when the drain had a sock blocking it. It expects the water to drain in this set amount of time but it doesn’t, and the cycle will not end until enough water has drained. If your washing is coming out wetter than expected, or if it is just taking a long time, I would look into how to service the drain. Or get it serviced by a professional.
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