Ugh. Been fighting with this stupid humidifier for ages. Thought it just needed to charge first. Had it plugged in for hours, nope. Giving me a "no water" angry red flash, even though it was full to the max fill line. Weird. Take the damn thing apart cause I thought maybe I could remove the sensor. Took the sensor off, no dice. Hmm. Then I remembered it said not to use distilled water. Hmm. I filled it up from the tap so that should be an issue. BUT we have really low PPM water. Hmmmm, wonder if the water isn't conductive enough to trigger the sensor. Put the stupid thing back together. Added salt to the water, no dice (and getting a low battery warning?) Plugged it in to my phone charger instead of the provided cable, its charging now. Added more salt, woo! It finally works lol. Putting it in the tent once its charged I guess since it didn't want to charge with the cable that came with it. Stupid but whatever I guess.