When the word "Lack" or an illuminated indicator light reading "Lack" appears on the digital control panel of a bottom-loading or advanced residential water dispenser, it serves as a warning signal indicating that the water bottle in the lower storage cabinet is completely empty or low on water. Because bottom-loading dispensers rely on an internal electric water pump to draw liquid upward, this sensor alerts you when suction is lost so the pump does not run dry and burn out. You can troubleshoot water levels easily by inspecting the jug. You can verify that your corrective action is successful when replacing the empty water bottle with a full jug causes the "Lack" warning indicator light to turn off automatically, restoring normal pump operation and water dispensing.
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