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I have had times where my Crane humidifier won't produce mist if I haven't turned it on for several days (4+) or more. The water that sits in the reservoir may develop a film on the ultrasonic element which inhibits the creation of the mist to come out the top of your humidifier. I would lift off the tank and empty the reservoir. Then VERY GENTLY with a piece of paper towel, wipe the ultrasonic element (looks like a disk the size of a quarter at the bottom of the reservoir) to clean off any film. Then replace the tank and let the reservoir fill up the tank and try it again.
If your humidifier runs properly for a minute and then makes a whirring noise and goes silent (like the motor stopping), then it's a motor problem. The humidifier motor may have gone out of alignment due to bumping or rough handling of the humidifier when cleaning or emptying it. If that is the case, you will have to empty the humidifier reservoir, unscrew the base, and find the screws holding down the motor and check for misalignment. Loosen them a little and put it back together and try again.
The moisture released by this (or any ultrasonic) humidifier should not be visible, so it is very possible that it is working correctly. Try filling the reservoir and marking the water level with a small piece of tape. Then run the humidifier for a few hours, and check the water level again. If the water level is below the edge of the tape, then you know it is releasing moisture into the air, and everything is working fine.
The older style of humidifiers created a mist by spinning a disk that was partly dipped into the water reservoir. They had to be refilled often, and the mist could leave water spots or dust on nearby furniture. The water level should change very slowly in your ultrasonic humidIfier compared to a misting humidifier.
if it's a cool mist unit it will not produce any mist. now if it's a warm mist unit it should. that's normal. it is possible to replace the transducer if it is damage but you are going to have some leakage from it. but the only way to get the transducer mainly is from the manufacturer
The Problem is minerals in the water. Impeller and ultrasonic designs send these minerals into the air. If the water in your area contains a lot of minerals, you will notice them as dust. The EPA does not issue health warnings about minerals in the air, but does recommend using low-mineral water (such as distilled water) in your humidifier. Many ultrasonic models feature a demineralization cartridge that filters minerals out of the water to prevent the dust.