WHEN SHOULD YOU SET THE ICE MAKER SWITCH TO O (OFF) * When the ice storage bin Is removed for more than a few minutes. + When the water supply will be shut off for several hours. = When the refrigerator will not be used for several days. NORMAL SOUNDS YOU MAY HEAR During use, you may hear an occasional “buzzing” noise coming from the back of your refrigerator. This is normal and occurs when the water valve Is turned on to allow water to fill the ice tray.