1. Introduction
The Vicks Ultrasonic Cool Mist Humidifier, Model V5100NS, is designed to return essential moisture to the air, helping to alleviate dry air discomfort and promote more comfortable breathing and sleep. This quiet, filter-free unit produces a visible cool mist and can operate for up to 24 hours, making it suitable for large rooms such as bedrooms. It also features an integrated scent pad for use with Vicks VapoPads or VapoSteam for added soothing comfort.

Figure 1: Vicks Ultrasonic Cool Mist Humidifier, Model V5100NS, showcasing its design and transparent water tank.
2. Safety Information
Please read and save these important safety instructions before using your humidifier. Failure to follow these instructions may result in electric shock, fire, or serious injury.
- Always place the humidifier on a firm, flat, waterproof surface at least 12 inches (30 cm) away from walls and 3 feet (0.9 m) from heat sources.
- Do not operate the humidifier without water in the tank.
- Do not use essential oils directly in the water tank; use the designated scent pad slot.
- Unplug the humidifier before filling, cleaning, or moving it.
- Keep out of reach of children and pets.
3. Product Overview
Familiarize yourself with the components of your Vicks Ultrasonic Cool Mist Humidifier:
- Water Tank: Transparent blue tank with a 1.5-gallon capacity.
- Base Unit: Houses the ultrasonic transducer, control dial, and scent pad slot.
- Mist Outlet: Adjustable dial on the lid to direct mist.
- Control Dial: Variable control for mist output.
- Scent Pad Slot: For Vicks VapoPads or VapoSteam.
- Demineralization Cartridge: Helps reduce mineral buildup.

Figure 2: Humidifier dimensions: 11.5"D x 13.25"W x 8.12"H.
4. Setup
- Unpack: Remove all packaging materials and place the humidifier on a flat, stable surface.
- Fill Water Tank: Remove the water tank from the base. Unscrew the tank cap and fill the tank with cool, clean tap water. Replace the cap securely.
- Place Tank on Base: Carefully place the filled water tank back onto the humidifier base, ensuring it is seated correctly.
- Optional Scent Pad: If desired, open the scent pad slot on the base and insert a Vicks VapoPad or add VapoSteam liquid as per product instructions. Close the slot.
- Plug In: Plug the power cord into a 120V AC electrical outlet.
5. Operating Instructions
- Turn On: Turn the control dial clockwise to the desired mist output setting. The humidifier will begin to produce a cool mist.
- Adjust Mist Output: Rotate the control dial to increase or decrease the mist intensity.
- Direct Mist: Adjust the mist outlet on the top of the tank to direct the mist away from walls, furniture, or bedding.
- Automatic Shut-off: The humidifier will automatically shut off when the water tank is empty.
- Refilling: When the humidifier shuts off, unplug the unit, remove the tank, and refill as described in the Setup section.
Video 1: Official Vicks Humidifier product overview, demonstrating basic operation and features.

Figure 3: The humidifier operating quietly in a child's room, providing comfortable air for sleep.
6. Maintenance
Regular cleaning is essential to prevent mineral buildup and ensure optimal performance. Clean your humidifier at least once a week.
6.1 Daily Maintenance
- Empty and rinse the water tank and base thoroughly.
- Allow all parts to air dry before reassembling.
6.2 Weekly Cleaning
- Descaling: Mix 1 teaspoon of white vinegar with 1 gallon of water. Pour into the water tank and let it sit for 20 minutes. Empty and rinse thoroughly.
- Cleaning the Base: Gently wipe the ultrasonic transducer and other internal parts of the base with a soft cloth or cotton swab dampened with white vinegar. Rinse thoroughly.
- Demineralization Cartridge: Replace the demineralization cartridge every 30-60 days, depending on water hardness and usage.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No mist or low mist output | No water in tank, mineral buildup, or clogged mist outlet. | Refill tank, clean humidifier as per maintenance instructions, ensure mist outlet is clear. |
| Unusual noise | Humidifier not on a level surface, mineral buildup on transducer. | Place on a level surface, clean transducer. |
| White dust around humidifier | Hard water minerals. | Use distilled water or replace demineralization cartridge. |
8. Specifications
- Model Number: V5100NS-VV1
- Operation Mode: Ultrasonic
- Color: Blue
- Product Dimensions: 11.5"D x 13.25"W x 8.12"H
- Water Tank Capacity: 1.5 Gallons (approximately 5.7 liters)
- Run Time: Up to 24 hours per filling
- Special Feature: Quiet operation, Integrated Scent Pad
- Manufacturer: Vicks
9. Warranty and Support
For warranty information, product registration, or technical support, please refer to the contact information provided in your product packaging or visit the official Vicks website. Keep your purchase receipt as proof of purchase for warranty claims.





