On the SATO 100 the feed water is shut off close to the middle of the wetside magnet. I would check to make sure there is no film or anything on the center lens of the wetside. Wipe it with you fingers really good. Also check to make sure the clear center is perfectly centered and not slanted. If you are still having issues please submit a support ticket at coralvue.com/support so one of our technicians can assist you in troubleshooting your ato.