Honeywell Humidifier HWM-335 Manual

The Honeywell HWM-335 is a cool mist humidifier designed for medium to large rooms up to 500 sq. ft. It features a 1-gallon tank capacity, adjustable humidity control, a quiet operation mode, an easy-to-clean design, an automatic shut-off when empty, a filter-free operation, and a refill indicator light. Powered by 120V AC, 60Hz. Below are key sections for safety, features, installation, 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. Replacing Parts 8. Safety Features 9. Care & Storage 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: 1-Gallon Water Tank, Base Unit with Mist Nozzle, Control Panel, Power Adapter, and Cleaning Brush.

Feature	Description
1-Gallon Tank	Removable tank for easy filling
Adjustable Mist Control	Knob to control mist output (Low/High)
Quiet Operation Mode	Special setting for nighttime use
Automatic Shut-Off	Turns off when water tank is empty
Refill Indicator Light	LED lights up when tank needs refilling
Filter-Free Operation	No replacement filters required
Easy-Clean Design	Wide opening for cleaning access
360° Mist Nozzle	Adjustable direction for optimal mist distribution
Power Indicator	LED shows when unit is powered on
Carry Handle	Integrated handle for easy transport

Installation & Setup

Unpack and inspect all contents. Place on a flat, stable, and level surface.

Remove all packaging materials from the humidifier and tank.
Place the base unit on a flat surface away from walls and electronics.
Fill the water tank: Remove tank, flip cap, fill with cool tap water, replace cap.
Place tank onto base: Align tank with base and press down gently until seated.
Plug power adapter into the base unit and then into a 120V AC outlet.

WARNING! Do not place on carpets or uneven surfaces. Ensure the unit is upright before plugging in.

First-Time Use

Power on the humidifier; adjust settings as needed.

Power On: Press the Power button. The Power Indicator LED will light up.
Set Mist Level: Turn the Mist Control knob to LOW or HIGH as desired.
Adjust Nozzle: Point the 360° mist nozzle in your preferred direction.
Monitor Humidity: Use the humidifier to achieve comfortable humidity levels (40-60% RH).
Quiet Mode: Press the Quiet Mode button for reduced noise during sleep.

CAUTION! Use only cool, clean tap water. Do not use hot water or additives.

Specifications

Model: HWM-335
Room Coverage: Up to 500 sq. ft.
Tank Capacity: 1 Gallon (3.8 Liters)
Run Time: Up to 24 hours on Low setting
Mist Output: Adjustable, up to 1.5 gallons per day
Operation: Cool Mist Ultrasonic
Noise Level: < 30 dB in Quiet Mode
Power Source: 120V AC, 60Hz, 25W
Dimensions (HxWxD): 14.2" x 10.6" x 8.7"
Weight (Empty): 4.4 lbs

Controls and Operation

Control Panel: POWER Button, MIST CONTROL Knob, QUIET MODE Button, REFILL Indicator Light.

Operation: Power On/Off with POWER button. Adjust mist output with MIST CONTROL knob (LOW for steady humidity, HIGH for rapid humidification). Activate QUIET MODE for minimal noise. The REFILL light will illuminate when the water tank is empty or nearly empty.

Automatic Shut-Off: The unit will automatically power off when the water tank is empty. The REFILL light will remain on until the tank is refilled.

Maintenance & Cleaning

Regular cleaning is essential to prevent mold and mineral buildup.

Daily: Empty and rinse the tank if not in use for more than 24 hours.
Weekly: Clean the tank and base with a mixture of white vinegar and water (1:1 ratio). Use the provided cleaning brush.
Monthly: Deep clean all parts. Soak the tank and base in vinegar solution for 20 minutes, then scrub and rinse thoroughly.
Always unplug the unit and empty all water before cleaning.
Dry all parts completely before reassembly and storage.

Tip: Use distilled water to reduce mineral deposits and cleaning frequency.

Replacing Parts

This is a filter-free humidifier. No regular filter replacements are needed.

If the mist output decreases significantly or stops, the ultrasonic nebulizer may need inspection or replacement. Contact Honeywell Customer Service for genuine parts.

WARNING! Do not attempt to disassemble the base unit. There are no user-serviceable parts inside.

Safety Features

Automatic Shut-Off: Activates when tank is empty to prevent damage. Tip-Over Protection: Internal switch cuts power if unit is knocked over. Overheat Protection: Thermal fuse protects against motor overheating.

Care & Storage

When not in use for an extended period:

Unplug the unit from the electrical outlet.
Empty and thoroughly clean the tank and base as per weekly cleaning instructions.
Allow all parts to air dry completely.
Reassemble the unit and store in its original box in a cool, dry place.

CAUTION! Never store with water in the tank. This can lead to mold growth and damage.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. This device complies with Part 18 of the FCC Rules. Copyright © Honeywell International Inc. For support, visit www.honeywellhome.com or contact 1-800-333-7467.

Troubleshooting

Symptom	Possible Cause	Corrective Action
No mist output	Empty tank / Incorrect assembly	Refill water tank. Ensure tank is properly seated on base.
Low mist output	Mineral buildup / Mist control on LOW	Clean the tank and nebulizer. Turn mist control to HIGH.
Unit not powering on	No power / Automatic shut-off active	Check power outlet and connection. Refill water tank if empty.
Water leakage	Tank not seated properly / Cracked tank	Remove and reseat tank. Inspect tank for damage; replace if cracked.
Unusual noise	Vibration on surface / Debris in fan	Place on a flat, hard surface. Clean fan area (unplug first).
Refill light stays on	Float stuck / Sensor issue	Gently shake unit to free float. Unplug for 10 minutes, then restart.

Reset: Unplug unit for 5 minutes, then restart.

Service: 1-800-333-7467; www.honeywellhome.com