I added a magnetic optical sensor to my return section so I can get an alert when the water is low and to trigger the return pump to turn off until I reset it. Most likely unnecessary, but it gives me peace of mind to keep the return pump from running dry and causing a fire or other issues. I dod not lower the sensor far enough and everything was kicked off, as expected, but when I lowered the sensor it never switched back to closed. I wait about 15 minutes and eventually unplugged the sensor and plugged it back in. This resolved the issue. Any ideas as to why the sensror status never switched to closed when it was moved under water?