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Homedics ARMH-590 Aroma Diffuser Manual

Homedics ARMH-590 Aroma Diffuser Manual Image




From beautiful diffusers to pure essential oils, HoMedics Aroma products complement your natural, healthy lifestyle. Once you try a diffuser, you’ll want one for every room. Add more to your home or buy one as a thoughtful gift. Browse the entire product collection at www.homedics.com.


A – Outer cover

B – Inner cover

C – Diffuser base

D – AC adapter

E – Essential oil starter kit


  1. Remove the outer cover from the base. Next, remove the inner cover.
  2. Pour water into the reservoir until it reaches the max fill line, then add 5–7 drops of essential oil to the water. Depending on your personal preference, you may add more or fewer drops of essential oil.
  3. Put the inner and outer covers back on.
  4. Plug the adapter into the diffuser, then plug the adapter into an outlet. Use caution when plugging the unit in to avoid spilling water and essential oil.
  5. Choose your aroma mist and light options.


Your diffuser has 2 mist options. Press once for continuous mist, which will run for up to 6 hours. Press again for intermittent mist (30 seconds on, 30 seconds off), which will run for up to 12 hours. Press a third time to turn the mist off. When your diffuser runs out of water, it will automatically shut off.


Ultrasonic technology

This diffuser uses ultrasonic, high-frequency technology to convert the water and essential oil into a fine mist that is dispersed into the air evenly, delivering natural aroma to enhance your mood.

Color-changing light

Press once to turn on the color-changing light. Press again to stop on a preferred color. Press a third time to turn the light off.


Up to 6 hours of continuous runtime or 12 hours of intermittent runtime.

Soothing humidity

Alleviates dry air.

Auto shut-off protection

When the reservoir is empty, the unit will shut off automatically.

Reservoir capacity

130 ml

Adapter voltage

100 – 240V 50/60Hz


  1. Before cleaning the unit, turn the power off and make sure the adapter is unplugged from the diffuser and outlet.
  2. Remove the outer cover from the base. Next, remove the inner cover.
  3. Carefully pour any remaining water and essential oil out of the reservoir, from the drain side, opposite the air outlet. Be sure not to empty the reservoir near the air outlet in order to avoid malfunction.

To clean the surface

Clean the surface of your diffuser with a clean, damp, soft cloth as often as needed.

To clean the reservoir and ultrasonic membrane

We recommend wiping the reservoir with a clean, damp, soft cloth at least once every 2 weeks.

NOTE: Depending on your usage, and the amount of essential oil you use, you may want to clean the reservoir and ultrasonic membrane more frequently for best performance.

For the most thorough clean, pour a 50/50 mixture of vinegar and water into the reservoir and let it soak for 5 minutes. Brush reservoir walls, base, and ultrasonic membrane clean with a soft-bristle brush (not included) and rinse. NEVER touch the ultrasonic membrane with your fingers, as the natural oils in skin can damage the membrane.

Clean the membrane once every 2 to 3 weeks, depending on your usage.

Clean and dry the unit before extended periods of inactivity


Visit us online to stock up on your favorite HoMedics Essential Oils, including our single notes and signature blends. www.homedics.com Homedics is a registered trademark of Homedics, LLC.


For service in the USA

email: [email protected]

tel: 1-800-466-3342

Monday to Friday, 8:30am – 7:00pm EST

For service in Canada

email: [email protected]

tel: 1-888-225-7378

Monday to Friday, 8:30am – 5:00pm EST





  • Always place diffuser on a firm, flat surface. A waterproof mat or pad is recommended for use under the diffuser.
  • Never place it on a rug or carpet, or on a finished floor that may be damaged by exposure to water or moisture.
  • Always unplug the unit from the electrical outlet immediately after using and before cleaning.
  • DO NOT reach for a unit that has fallen into water. Unplug it immediately.
  • DO NOT place or drop into water or other liquids.
  • DO NOT use water above 86° Fahrenheit.
  • Use this unit only for its intended purpose as described in this document, the Quick-Start Guide and User Guide.
  • Do not use attachments not recommended by HoMedics; specifically any attachments not provided with this unit.
  • NEVER drop or insert any object into any opening.
  • DO NOT place the diffuser near heat sources, such as a stove.
  • Always keep the cord away from high temperature and fire.
  • To disconnect, turn unit off, then remove the plug from the outlet.
  • DO NOT use outdoors. For indoor use only.
  • Never cover the unit while it is operating.
  • If the cord sustains damage, you must stop using this product immediately and contact HoMedics Consumer Relations (see Warranty section for Consumer Relations contact information).
  • Perform regular maintenance on the ultrasonic membrane.
  • Never use detergent to clean the ultrasonic membrane.
  • Never clean the ultrasonic membrane by scraping with a hard object.
  • Do not attempt to adjust or repair the unit. Servicing must be performed by professional, qualified personnel.
  • Stop using this unit if there is an unusual noise or smell.
  • Unplug this unit when not in use for a long period of time.
  • Do not touch the water or any parts of the unit that are covered by water while the unit is on or plugged in.
  • Do not wash, adjust, or move this unit without first unplugging it from the electrical outlet.
  • Keep this unit out of reach of children.


This device complies with Part 15 of the FCC Rules. Operation is subject to the following 2 conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules and CAN ICES-3 (B) /NMB-3 (B). These limits are designed to provide reasonable protection against harmful interference in a residential installation.

This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.

However, there is no guarantee that interference will not occur in a particular installation.

If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

  • Reorient or relocate the receiving antenna.
  • Increase the separation between the equipment and receiver.
  • Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
  • Consult the dealer or an experienced radio/TV technician for help.

Changes or modifications not expressly approved by HoMedics could void the user’s authority to operate this equipment.

This product has been tested and complies with the requirements for Federal Communication Commission, Part 18 and CAN ICES-1/NMB-1. Although this product is tested and complies with FCC, it may interfere with other devices. If this product is found to interfere with another device, separate the other device and this product. Conduct only the user maintenance found in this instruction manual. Other maintenance and servicing may cause harmful interference and can void the required FCC compliance.

©2018 HoMedics, LLC. All rights reserved. HoMedics is a registered trademark of HoMedics, LLC.

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