sometimes even the company that made equipment doesn't know how it works.

my dishwasher after few months suddenly instead of filling water and starting wash cycle initiated some kind of fill & drain cycle that went for a while without going into wash mode.

i called in service. they replaced pump, solenoid. talked with manufacturer directly, swapped a couple of main boards. it made dishwasher snap out of it.

few months later it started again. this time i allowed it to do whatever it was doing. after 15 minutes it started to wash.

over the time i noticed that dishwasher does this water cycling every few months and adds extra time to estimated program duration.

about once a year after asking a few questions if sprayer hands/filters/etc are clean, it will add 2 hours to wash cycle.

none of it described in manual, manufacturer service personal and "Factory support" that service talk to know about it (maybe they do by now. they didn't few years ago)