What should I do when the red light illuminates on the Clean indicator button?
When the red LED illuminates on the Clean indicator/reset button, it means the transducer/ultrasonic membrane needs cleaning. Clean the membrane using a 50/50 mix of white vinegar and water applied with a cotton swab. After cleaning and refilling the tank with water, press and hold the clean indicator/reset button until the red LED turns off. (Page 7, 9, 12)
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