Flip the butterfly switch back to stop, wait 10 seconds, flip it on ice. That will remove it from clean mode. It will only go into clean if the switch is manually flipped. Located inside the lower cover. Now if is in ice mode and water is continuously entering, that is a different problem. Water will continue to flow in with the machine in off if the valve is bad.
If there was some work on the house water system, a water hammer, or a loss of water pressure you may have gotten a piece of foreign material in the valve. Changing or working on that valve is not easy due to it being a under-counter machine. It will have to recycle if turned off and then put back into ice mode. This sometimes dislodges the particle. The manuals for this machine are here;
http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/SC-CU0415_iom.pdf
http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/SC-CU0415_sm.pdf
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