Medisana
Ultrasonic Transducer Failure
Humidifier runs but produces no mist at all.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Burnt ultrasonic transducer disc, Failed ultrasonic driver circuit on PCB, Heavy limescale on transducer surface, Loose wiring to transducer module
How to Fix / Troubleshooting
Safety: Unplug the humidifier and empty the tank before opening the base.
- Check water and seating: Confirm the tank is full and properly seated so water flows into the base reservoir.
- Inspect transducer: Look at the metal disc at the bottom of the reservoir. If it is cracked, discolored, or heavily scaled, it may not vibrate correctly.
- Descale: Soak the reservoir area around the disc with a 1:1 vinegar-water solution for 20–30 minutes, then gently wipe. Do not use sharp tools on the disc.
- Wiring check: Open the base and ensure the transducer wires are firmly connected to the PCB.
- Replace module: If there is still no mist, replace the ultrasonic transducer module or the entire base assembly with a Medisana-compatible part. If the new transducer does not work, the main PCB is likely defective and should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Ultrasonic Transducer Module
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