There's a pressure switch that tells the machine how full the machine is as well. A rubber tube from the bottom of the machine runs up the back to a pressure switch that's usually mounted to the frame near the top.
When there's an issue with the switch you'll usually get an error code but sometimes on mine it just doesnt spin and I get a generic code. I unplug the machine, take off the top, unplug the rubber hose and blow into it to clear it out. It's a small hose so if anything gets into it, the pressure sensor wouldnt be able to get a reading. I have to do this a few times a year and normally clean the filter when it's all apart.
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