Honeywell Humidifier HM512WTHX9 Manual

The Honeywell HM512WTHX9 is a top-fill evaporative humidifier designed for medium to large rooms, featuring a 1.5-gallon tank capacity, adjustable humidity control, quiet operation, wicking filter technology, easy top-fill design, auto shut-off, and a refill indicator light. It helps relieve dry air discomfort from heating systems. 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. Filling the Water Tank 7. Maintenance & Cleaning 8. Filter Replacement 9. Safety Information 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: Top-fill water tank, Wicking Filter, Humidistat Control Knob, Power Switch, Refill Indicator Light, Air Outlet Grille, Base Unit.

Feature	Description
Top-Fill Design	Easy to fill directly from the top without removing tank
1.5-Gallon Tank Capacity	Suitable for medium to large rooms up to 400 sq ft
Adjustable Humidistat	Dial control to set desired humidity level
Wicking Filter	Evaporative filter that traps impurities; replaceable
Quiet Operation	Quiet fan for nighttime use
Refill Indicator Light	LED light turns on when water level is low
Auto Shut-Off	Automatically turns off when tank is empty or removed
Carry Handle	Integrated handle for easy transport
Power Cord Storage	Compartment to store excess cord
Easy-Clean Tank	Wide opening for cleaning access

Installation & Setup

Unpack and inspect all parts. Place on a flat, stable surface away from walls and electronics.

Remove all packaging materials from tank and base.
Install wicking filter: Remove filter from package, insert into filter frame in base.
Fill water tank: Use clean, cool tap water. Do not use hot water or additives.
Place tank on base: Align tank with base, ensure it sits securely.
Plug into standard 120V AC outlet.

WARNING! Place on a level, waterproof surface. Keep away from children. Do not block air inlet or outlet.

First-Time Use

Power on humidifier; set desired humidity level.

Fill tank with clean, cool water.
Place tank on base; ensure proper alignment.
Plug power cord into outlet.
Turn Power Switch to ON position.
Adjust Humidistat Control Knob to desired humidity level (Low to High).
Allow a few minutes for moisture output to begin.

CAUTION! Use only clean, cool tap water. Do not operate without water or filter installed.

Specifications

Model: HM512WTHX9
Tank Capacity: 1.5 gallons (5.7 liters)
Room Coverage: Up to 400 square feet
Run Time: Up to 24 hours on low setting
Humidistat: Adjustable dial control
Filter Type: Evaporative wicking filter (replaceable)
Power: 120V AC, 60Hz
Power Consumption: 30W max
Dimensions: 13.5" H x 10.5" W x 10.5" D
Weight (empty): 5.5 lbs
Noise Level: < 35 dB on low setting

Controls and Operation

Front Panel Controls: Power Switch (On/Off), Humidistat Control Knob (Low to High), Refill Indicator Light.

Operation: Turn Power Switch ON. Adjust Humidistat to desired setting. Higher settings increase fan speed and moisture output. Refill Indicator Light illuminates when water level is low. Unit will auto shut-off when tank is empty.

Optimal Settings: For sleeping, use Low setting. For dry days, use Medium to High. Maintain indoor humidity between 40-60% for comfort.

Filling the Water Tank

Top-fill design allows easy refilling without removing tank.

Turn Power Switch OFF.
Open top fill cap on tank.
Pour clean, cool water directly into opening. Use pitcher if needed.
Close fill cap securely.
If tank was removed, realign and place back on base.
Turn Power Switch ON; humidifier resumes operation.

Tip: Refill when Indicator Light turns on. Use distilled water to reduce mineral buildup if water is hard.

Maintenance & Cleaning

Regular cleaning prevents mold and mineral deposits.

Unplug unit from outlet.
Remove water tank and empty any remaining water.
Clean tank with mild soap and water; rinse thoroughly.
Wipe base interior with damp cloth; do not submerge base.
Clean exterior with soft, dry cloth.
Allow all parts to air dry completely before reassembly.

CAUTION! Never use abrasive cleaners, bleach, or solvents. Do not immerse base in water.

Filter Replacement

Replace wicking filter every 1-3 months depending on usage and water hardness.

Unplug unit and remove water tank.
Remove old filter from filter frame in base.
Insert new filter into frame; ensure it sits flat.
Reinstall water tank and plug in unit.
Run on High for 10 minutes to condition new filter.

Note: Use only genuine Honeywell replacement filters (Part #HWF-110). A dirty or clogged filter reduces performance.

Safety Information

Read all instructions before use.

Use only 120V AC outlet.
Do not operate without water or filter.
Keep out of reach of children and pets.
Do not cover air inlet or outlet.
Place on level, waterproof surface.
Unplug before cleaning or maintenance.
Do not use with damaged cord or plug.
Use only clean, cool water. Do not add essential oils or chemicals.

WARNING! Risk of electric shock if immersed. Do not use in bathrooms or wet areas.

Regulatory Information

FCC Compliance: This device complies with Part 15 of FCC Rules. Operation is subject to condition that device does not cause harmful interference. UL Listed: Meets UL safety standards. Copyright © Honeywell International Inc. Honeywell and related marks are trademarks of Honeywell. For support, visit www.honeywellhumidifiers.com or contact 1-800-332-1110.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist/output	Empty tank, filter dry, power off	Fill tank with water; ensure filter is wet; check power switch and outlet.
Low mist output	Clogged filter, low humidity setting	Replace filter; adjust humidistat to higher setting.
Unit not turning on	No power, auto shut-off engaged	Check outlet; ensure tank is properly seated and contains water.
Water leakage	Tank not seated, overfilled, damaged seal	Reposition tank; do not overfill; check tank and base for cracks.
Noisy operation	Mineral buildup, fan obstruction	Clean tank and base; ensure nothing blocks fan.
Refill light not working	Sensor issue, bulb failure	Ensure tank is empty; contact support if light fails.

Reset: Unplug for 5 minutes, then restart.

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