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ABOUT WHITE DUST
Use of high mineral content hard water may cause a white mineral residue to accumulate on surfaces
in the room near the humidifier. The mineral residue is commonly called "white dust." The higher the
mineral content (or, the harder your water is), the greater the potential for white dust. The white dust is
not caused by a defect in the humidifier. It is caused only by minerals suspended in the water.
HOW AND WHY TO USE DEMINERALIZATION CARTRIDGES
The HoMedics demineralization cartridge will help reduce the potential for white dust, a deposit of
minerals left behind from using hard water in your humidifier. The cartridge should be replaced every
30–40 fillings. The cartridge may need to be replaced more often if you are using very hard water. Replace
the cartridge when you notice an increase in white dust buildup. If white dust still forms around the
humidifier after a new cartridge has been installed, consider using distilled water.
If you live in an area with hard water or use a water softener, we recommend using distilled water for
best results. Never use water-softening additives in your humidifier.
INSTALLATION INSTRUCTIONS
1. Remove demineralization cartridge from packaging and soak
in water for 10 minutes.
2. Remove the tank cover.
3. Fill the tank with water as shown in the How to Fill section of
this instruction book.
4. Add the soaked demineralization cartridge to the tank.
5. Replace the tank cover on the humidifier.
To purchase genuine HoMedics Replacement Essential Oil Pads, Model # UHE-PAD1, go to the retailer where you purchased your HoMedics
TotalComfort Ultrasonic Humidifier, or visit www.homedics.com (US), www.homedics.ca (CAN).
To purchase genuine HoMedics Essential Oils, go to the retailer where you purchased your HoMedics TotalComfort Ultrasonic Humidifier, or
visit www.homedics.com (US), www.homedics.ca (CAN).
To purchase new Demineralization Cartridges, Model # UHE-HDC4, go to the retailer where you purchased your HoMedics TotalComfort
Ultrasonic Humidifier, or visit www.homedics.com (US), www.homedics.ca (CAN).
Demineralization Cartridge
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Need help?
Do you have a question about the UHE-CMTF91 and is the answer not in the manual?
Questions and answers
How do I get an instruction manual and where can I get cartridges.
To obtain an instruction manual for the HoMedics UHE-CMTF91, visit www.homedics.com (for the USA) or www.homedics.ca (for Canada). To acquire cartridges or other accessories, you may also contact HoMedics customer service at 1-800-466-3342 (USA) or 1-888-225-7378 (Canada) during their operating hours.
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Will not work no buttons will work
The HoMedics UHE-CMTF91 may not be working and the buttons may not be responding due to the following possible causes:
1. Power Issue – The device may not be plugged in properly. Solution: Ensure the humidifier is connected to a working power outlet.
2. Power Supply Problem – There may be an issue with the circuit or fuse. Solution: Check the circuit breakers, fuses, or try a different outlet.
3. Low Water Level – The water level might be too low for the unit to function. Solution: Refill the water tank.
4. Dirty Transducer/Membrane – The ultrasonic transducer or membrane may require cleaning. Solution: Follow the cleaning instructions provided in the manual.
5. Incorrect Humidistat Setting – The humidistat may be set lower than the ambient humidity. Solution: Adjust the humidistat to a higher humidity level or set it to continuous mode.
6. Clogged Output Valve – The output valve may need cleaning. Solution: Follow the cleaning steps in the manual.
If the issue persists after checking these points, further troubleshooting may be needed.
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Hi. I have the CMT F91. Lights are on, plenty of water in tank but no mist comes out.
If your HoMedics UHE-CMTF91 humidifier is not producing mist despite having water and lights on, consider these possible reasons:
1. Empty or Incorrectly Seated Water Tank – Ensure the tank is filled with water and properly placed on the base.
2. Mineral Buildup – If the unit has been used without cleaning, mineral deposits may block the ultrasonic transducer. Clean the unit according to the manual.
3. Demineralization Cartridge Issue – If using a demineralization cartridge, check if it needs replacement, as an old or clogged cartridge can affect mist production.
4. Wrong Mist Level Setting – Ensure the mist level is not set too low.
5. Room Humidity Levels – If the room is already humid, the unit may produce less mist.
6. Blocked Mist Outlet – Check for any obstructions in the mist outlet.
7. Internal Malfunction – If none of the above solutions work, the unit may need professional servicing.
Try troubleshooting these issues to restore mist production.
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