Honeywell Humidifier HE420B Manual

The Honeywell Humidifier HE420B is a 4-gallon capacity cool mist humidifier designed for medium to large rooms up to 400 square feet. It features adjustable humidity control, a wicking filter system, a refill indicator light, a quiet operation mode, an easy-to-clean tank design, and an auto-shutoff function when empty. Below are key sections for safety, features, installation, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: 4-gallon water tank, wicking filter, adjustable humidity dial, refill indicator light, quiet operation mode, easy-carry handle, and auto-shutoff.

Installation & Setup

Unpack and inspect contents. Place on a flat, stable surface away from walls and furniture.

1. Remove all packaging materials from humidifier and filter.
2. Install the wicking filter: Remove from plastic wrap, soak in cool water for 15 minutes, then insert into filter frame.
3. Fill the water tank: Carry to sink, remove cap, fill with cool tap water, replace cap securely.
4. Place tank on base: Align tank with base unit and set down gently.
5. Plug into a standard 120V AC outlet.

WARNING! Place on a water-resistant surface. Keep away from children. Do not use with damaged cord or plug.

First-Time Use

Power on humidifier; adjust settings as needed.

1. Turn the humidity control dial to desired setting (Low to High).
2. Observe the refill indicator light; it will illuminate when tank is empty.
3. For quiet operation, set dial to lower settings.
4. Allow 15-20 minutes for humidity levels to adjust in room.

CAUTION! Use only clean, cool tap water. Do not add essential oils or chemicals to water tank.

Specifications

• Model: HE420B
• Tank Capacity: 4 gallons (15.1 liters)
• Coverage Area: Up to 400 sq ft
• Output: Up to 1.2 gallons per day
• Filter Type: Wicking filter (replace every 1-2 months)
• Power: 120V AC, 60Hz
• Power Consumption: 30W
• Dimensions: 15.5" H x 13.5" W x 10.5" D
• Weight (empty): 7.5 lbs
• Noise Level: < 35 dB on low setting

Controls and Settings

Main control: Humidity dial (rotating knob). Indicator: Refill light (red).

Humidity Dial: Turn clockwise to increase mist output (HIGH), counterclockwise to decrease (LOW).

Refill Indicator Light: Illuminates red when water tank is empty or nearly empty.

Auto-Shutoff: Automatically turns off unit when tank is empty to prevent damage.

Quiet Mode: Achieved by setting dial to LOW position.

Operation Guide

Daily operation steps for optimal performance.

1. Ensure humidifier is on flat, stable surface.
2. Check that filter is properly installed and moist.
3. Fill tank with clean, cool tap water; replace cap securely.
4. Place tank on base; plug into outlet.
5. Turn humidity dial to desired setting.
6. Monitor refill light; refill when illuminated.
7. Turn dial to OFF position when not in use.

Tip: Use a hygrometer to monitor room humidity; ideal range is 30-50%.

Maintenance & Cleaning

Regular cleaning prevents mold and mineral buildup.

1. Unplug unit before cleaning.
2. Empty any remaining water from tank and base.
3. Clean tank with mild soap and warm water; rinse thoroughly.
4. Wipe base with damp cloth; do not immerse in water.
5. Clean filter frame and housing with soft brush.
6. Allow all parts to air dry completely before reassembly.
7. Perform deep cleaning every 1-2 weeks during use.

WARNING! Never use abrasive cleaners, bleach, or harsh chemicals.

Filter Replacement

Replace wicking filter every 1-2 months for optimal performance.

1. Unplug humidifier and remove water tank.
2. Remove old filter from filter frame.
3. Soak new filter in cool water for 15 minutes.
4. Insert new filter into frame; ensure it sits flat.
5. Reassemble unit and resume use.

Note: Using the humidifier without a filter or with a dirty filter may reduce performance and cause mineral dust output.

Care Instructions

Store properly when not in use for extended periods.

1. Unplug unit and empty all water.
2. Clean all parts thoroughly and allow to dry completely.
3. Remove filter and discard; store unit without filter.
4. Store in original box or cover in a cool, dry place.
5. Before next use, install new filter and clean again.

CAUTION! Do not store with water in tank to prevent mold growth.

Regulatory Information

FCC Part 15: Class B digital device; complies with interference limits for residential use. Copyright © Honeywell International Inc. For support, visit www.honeywellhumidifiers.com or contact 1-800-332-1110. This product is covered by a 1-year limited warranty.

Troubleshooting

Reset: Unplug for 5 minutes, then restart.

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