Honeywell Humidifier HWM845 series Manual

The Honeywell HWM845 series is a high-performance cool mist humidifier designed to add comfortable moisture to dry indoor air. It features a large-capacity tank, adjustable humidity control, quiet operation, an easy-to-clean design, a built-in humidistat, an automatic shut-off function when empty, a refill indicator, and a wicking filter system. Ideal for medium to large rooms. Below are key sections for safety, features, setup, operation, maintenance, and troubleshooting.

Features at a Glance

Key components: Large-capacity water tank, Control Panel with Humidistat, Wick Filter, Mist Nozzle, Power Base, Refill Indicator, and Carry Handle.

Installation & Setup

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

1. Select Location: Place on a flat, level surface at least 12 inches away from walls and furniture. Ensure it is out of reach of children and pets.
2. Install Wick Filter: Remove filter from packaging and insert into the filter frame in the base. Ensure it is seated properly.
3. Fill Tank: Remove tank from base, carry to sink, unscrew cap, fill with cool, clean tap water. Replace cap securely.
4. Assemble: Place filled tank back onto the base, aligning it properly.
5. Power: Plug power cord into a standard 120V AC outlet.

WARNING! Use only clean, cool tap water. Do not use hot water, additives, or essential oils unless specified. Do not block mist outlet.

First-Time Use

Power on the humidifier and configure initial settings.

1. Initial Soak: After installing a new wick filter, allow it to soak in the base water for 15-20 minutes before turning on.
2. Power On: Press the POWER button. The unit will beep and the display will illuminate.
3. Set Humidity: Use the +/- buttons or dial to set your desired humidity level (typically between 40-60% RH).
4. Adjust Mist: Turn the MIST CONTROL knob to select Low or High output.
5. Monitor: The humidistat will monitor room humidity and cycle the unit to maintain your set level.

CAUTION! Always place on a waterproof mat or tray if surface is sensitive to moisture. Never operate without the water tank properly seated.

Specifications

• Model Series: HWM845 (e.g., HWM845A, HWM845B).
• Tank Capacity: 1.5 Gallons (approx. 5.7 Liters).
• Room Coverage: Up to 500 square feet (Medium to Large room).
• Run Time: Up to 24 hours on Low setting (full tank).
• Output: Up to 1.2 gallons per day (approx.).
• Humidistat: Built-in, adjustable.
• Noise Level: Quiet operation, suitable for bedrooms.
• Filter Type: Replaceable wick filter (Part # HWM845FILTER).
• Power Source: 120V AC, 60Hz.
• Dimensions (approx.): 15.5" H x 11.5" W x 10.5" D.
• Weight (Empty): 7.5 lbs.

Controls and Operation

Control Panel located on the front or top of the unit.

Buttons & Indicators: POWER Button, HUMIDITY +/- Buttons, MIST CONTROL Knob, REFILL Indicator Light, HUMIDISTAT Display.

Operation Modes: Manual Mode: Set desired humidity level; unit runs until level is reached. Constant Mode: Set mist to High or Low for continuous output. Auto Mode: Built-in humidistat maintains set humidity automatically.

Settings: Humidity Level (30%-80% RH), Mist Output (Low/High), Timer (if equipped), Filter Reset Indicator.

Filling the Water Tank

1. Turn off and unplug the humidifier.
2. Grasp the carry handle and lift the water tank straight up off the base.
3. Carry tank to sink. Turn upside down and unscrew the tank cap (located on bottom).
4. Fill with cool, clean tap water. Do not overfill.
5. Screw the cap back on tightly. Ensure the O-ring seal is in place.
6. Place tank back onto base, aligning it until it seats firmly. A click may be heard.
7. Plug in and power on. The refill light should turn off.

Tip: Use distilled or demineralized water to further reduce white dust and mineral buildup, especially in hard water areas.

Maintenance & Cleaning

Regular cleaning is essential for performance and to prevent microbial growth.

Daily/Weekly: Wipe exterior with a soft, damp cloth. Check and clean the mist nozzle if clogged.

Cleaning the Tank and Base (Every 1-2 Weeks):

1. Unplug unit. Remove tank and pour out any remaining water.
2. Fill tank with 1 cup of white vinegar and the rest with clean water. Let sit for 20 minutes.
3. Scrub interior with a soft brush. Rinse thoroughly with clean water.
4. Clean the base reservoir with a vinegar/water solution. Use a cloth or brush to remove film or scale.
5. Rinse all parts thoroughly until vinegar smell is gone. Air dry completely before reassembly.

CAUTION! Never immerse the power base, control panel, or motor in water. Do not use abrasive cleaners, bleach, or detergents not recommended by the manufacturer.

Filter Replacement

The wick filter should be replaced every 1-2 months, or more often in hard water conditions or with continuous use.

1. Unplug humidifier and remove water tank.
2. Lift out the old wick filter from the base frame. Discard it.
3. Insert the new Honeywell HWM845FILTER into the frame. Ensure it is fully seated and straight.
4. Soak the new filter in the base with clean water for 15-20 minutes before first use.
5. Reinstall tank, plug in, and power on. Reset the filter indicator if your model has one (usually by holding the POWER button for 5 seconds).

Note: A dirty or clogged filter reduces mist output and efficiency. Always use genuine Honeywell replacement filters.

Safety Information

• Read all instructions before use.
• Use only as described in this manual.
• Place on a stable, level, waterproof surface.
• DO NOT place under shelves or in enclosed spaces.
• DO NOT use with damaged cord or plug.
• DO NOT add essential oils, medications, or chemicals to water unless unit is specifically designed for it.
• DO NOT block mist outlet.
• Unplug before cleaning, filling, or moving.
• Keep out of reach of children and pets.
• Automatic Shut-Off: Unit will shut off when tank is empty. This is a safety feature.

Regulatory Information

This humidifier complies with Part 15 of the FCC Rules. Operation is subject to the condition that this device does not cause harmful interference. Copyright © Honeywell International Inc. Honeywell and the Honeywell logo are registered trademarks of Honeywell International Inc. For support, replacement parts, or to locate a service center, visit www.honeywellpluggedin.com or contact Honeywell Consumer Products at 1-800-332-1110.

Troubleshooting

Reset: Unplug unit for 5 minutes to reset electronic controls.

Service: For repairs not covered in this guide, contact Honeywell Consumer Products at 1-800-332-1110 or visit the support website. Do not attempt to disassemble the motor or electronic components.