Honeywell Humidifier HWM910C Manual

The Honeywell HWM910C is a 1-gallon ultrasonic cool mist humidifier designed for medium rooms up to 250 sq ft. It features a 24-hour runtime, adjustable mist output control, 360-degree mist nozzle, optional night light, auto shut-off when empty, and easy-to-clean design. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

1. Features at a Glance 2. Installation & Setup 3. First-Time Use 4. Specifications 5. Controls and Operation 6. Maintenance & Cleaning 7. Water Tank Refilling 8. Safety Features 9. Care & Storage 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 1-gallon water tank, ultrasonic mist generator, adjustable mist control knob, 360-degree nozzle, night light, power base with indicator light.

Feature	Description
Water Tank Capacity	1 gallon (3.8 liters)
Coverage Area	Up to 250 square feet
Runtime	Up to 24 hours on low setting
Mist Output Control	Adjustable knob for low/medium/high mist
360-Degree Nozzle	Rotatable for directional mist output
Night Light	Optional soft blue light with on/off switch
Auto Shut-Off	Turns off automatically when water tank is empty
Power Indicator	Blue LED light on power base
Cleaning Indicator	Flashing light reminds to clean unit
Carry Handle	Integrated handle for easy transport

Installation & Setup

Unpack and inspect all parts. Place on level, stable surface away from electronics.

Remove water tank: Lift tank from base unit.
Fill tank: Turn upside down, remove cap, fill with cool tap water to MAX line.
Replace cap securely: Ensure tight seal to prevent leaks.
Place tank on base: Align tank with base, press down gently until seated.
Plug into outlet: Use 120V AC outlet; ensure hands are dry.

WARNING! Place on waterproof surface; keep away from walls and furniture to prevent moisture damage.

First-Time Use

Power on humidifier; adjust settings as needed.

Turn mist control to OFF position before plugging in.
Plug into outlet: Power indicator light will illuminate blue.
Adjust mist output: Turn knob to desired setting (LOW, MEDIUM, HIGH).
Rotate nozzle: Direct mist away from walls and electronics.
Optional night light: Press night light button to turn on/off.

CAUTION! Use only cool tap water; do not use hot water or additives.

Specifications

Model: HWM910C
Tank Capacity: 1 gallon (3.8 L)
Room Coverage: Up to 250 sq ft
Mist Output: Up to 1.5 gallons per day
Runtime: Up to 24 hours (low setting)
Power: 120V AC, 60Hz, 25W
Noise Level: Ultrasonic quiet operation
Dimensions: 11.8" H x 9.5" W x 7.9" D
Weight: 3.5 lbs (empty)
Warranty: 1-year limited warranty

Controls and Operation

Front panel controls: Mist output knob, night light button.

Mist Control Knob: OFF, LOW, MEDIUM, HIGH settings. Turn clockwise to increase mist.

Night Light: Press button to toggle blue light on/off.

360-Degree Nozzle: Rotate to direct mist flow.

Indicator Lights: Blue power light (steady when on, off when unit off). Cleaning indicator flashes every 24 hours of operation.

Maintenance & Cleaning

Regular cleaning prevents mold and mineral buildup.

Unplug unit and remove water tank.
Empty any remaining water from tank and base.
Clean tank: Use mild soap and warm water; rinse thoroughly.
Clean base: Wipe with damp cloth; do not submerge in water.
Descale monthly: Use white vinegar solution (1 part vinegar to 2 parts water) to remove mineral deposits.
Dry completely: Allow all parts to air dry before reassembly.

Tip: Clean unit at least once per week during regular use.

Water Tank Refilling

Refill when mist output decreases or tank is empty.

Turn mist control to OFF and unplug unit.
Lift tank from base using carry handle.
Turn tank upside down and remove fill cap.
Fill with cool tap water to MAX line (do not overfill).
Replace cap securely and wipe any spills.
Return tank to base and plug in unit.

WARNING! Never fill tank while on base; always turn off and unplug before refilling.

Safety Features

Auto Shut-Off: Turns off when water tank is empty to prevent damage. Cleaning Indicator: Flashes after 24 hours of operation to remind user to clean. Tip-Over Protection: Unit stops operating if tipped over.

Care & Storage

When not in use for extended periods, prepare for storage.

Unplug unit and empty all water.
Clean thoroughly following maintenance instructions.
Allow all parts to dry completely.
Reassemble unit and store in original box if available.
Store in cool, dry place away from direct sunlight.

CAUTION! Never store with water in tank; this can cause mold growth.

Regulatory Information

FCC Compliance: This device complies with Part 15 of FCC rules. UL Listed: Meets safety standards. Copyright © Honeywell International Inc. For support, visit www.honeywellhumidifiers.com or contact 1-800-332-1110.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist output	Empty tank/incorrect setting	Refill water tank; ensure mist control is not on OFF.
Low mist output	Mineral buildup	Clean unit and descale with vinegar solution.
Unit not powering on	Not plugged in/outlet issue	Check power connection; try different outlet.
Water leaking	Loose cap or overfilled tank	Ensure fill cap is tight; do not fill above MAX line.
White dust around unit	Minerals in water	Use distilled water or demineralization cartridge.
Unusual noise	Vibration or debris	Place on level surface; check for objects in water tank.

Reset: Unplug for 5 minutes, then restart.

Service: 1-800-332-1110; www.honeywellhumidifiers.com