Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of your Nest NC5100US Smart Doorbell. The Nest Doorbell is designed to enhance your home security and convenience by providing real-time video, two-way audio communication, and intelligent alerts directly to your mobile device.

Figure 1: Front view of the Nest NC5100US Smart Doorbell, showcasing its sleek design and integrated camera.
Setup and Installation
The Nest NC5100US Smart Doorbell is a wired device that requires connection to your existing doorbell wiring and a compatible transformer. Ensure you have the necessary tools and understand your home's electrical system before beginning installation. If you are unsure, consult a qualified electrician.
Compatibility Check
Before installation, it is crucial to determine the type of chime and transformer present in your home. This will dictate the compatibility and specific wiring requirements for your Nest Doorbell.

Figure 2: Compatibility flowchart to determine the correct Nest Doorbell model and wiring based on your existing chime and transformer. This diagram helps identify if your setup supports the wired Nest Doorbell (NC5100US) and its power requirements (8-24VAC or 16-24VAC).
Installation Steps
- Turn off power: Locate your doorbell's circuit breaker and turn off the power to prevent electrical shock.
- Remove old doorbell: Carefully disconnect and remove your existing doorbell button.
- Connect Nest Doorbell: Follow the specific wiring instructions provided in the Nest app for your model. The Nest Doorbell requires a wired connection.
- Mount the doorbell: Securely attach the Nest Doorbell to your wall using the provided mounting hardware.
- Restore power: Turn the power back on at the circuit breaker.
- Set up in Nest app: Download the Nest app, create an account, and follow the on-screen prompts to connect your doorbell to your Wi-Fi network and complete the setup.

Figure 3: A person installing the Nest Doorbell, demonstrating the physical attachment process to the exterior wall. This image highlights the wired connection requirement.
For detailed, step-by-step installation guides, refer to the Nest app or the official Nest support website.
Operating Your Nest Doorbell
The Nest Doorbell offers a range of features accessible through the Nest app, designed to keep you connected to your front door from anywhere.
Visitor Interaction
When someone presses your doorbell or is detected by the camera, you will receive an alert on your phone. You can then view live video and speak to visitors using the two-way audio feature.

Figure 4: A child interacting with the Nest Doorbell, illustrating the ease of use for visitors to press the illuminated button.

Figure 5: A woman at a red door, with a speech bubble indicating two-way communication with the Nest Doorbell. This image demonstrates the "Listen and Talk Back" feature, allowing users to communicate with visitors remotely.
Intelligent Alerts and Monitoring
- Person Alerts: The doorbell can distinguish between a person and other objects, sending you relevant notifications.
- HD Video: Enjoy bright, crisp 4:3 HD video, providing a head-to-toe view of visitors.
- 24/7 Streaming & History: Check in anytime with live streaming or review a 3-hour snapshot history. Continuous video recording is available with a Nest Aware Plus subscription (sold separately).
- Package Detection: With a Nest Aware subscription, the doorbell can automatically alert you when packages are delivered or picked up.

Figure 6: A hand holding a smartphone displaying a "Person alert" notification from the Nest app, indicating the doorbell's ability to detect and notify about human presence.

Figure 7: A hand holding a smartphone displaying a live video feed from the Nest Doorbell, showing a person at the door. This illustrates the high-definition video quality and the ability to see visitors clearly.

Figure 8: A laptop screen displaying the Nest app interface with a video history timeline, showing two people at a yellow door. This image demonstrates the 24/7 streaming and video history features, allowing users to review past events.

Figure 9: A hand holding a smartphone displaying a "Package delivered" notification from the Nest app, showcasing the doorbell's package detection capability.
The Nest Doorbell also works seamlessly with other Nest and Google Home devices, including the Nest x Yale Lock (sold separately), to create a more integrated smart home security system.

Figure 10: The Nest Doorbell positioned next to a Nest x Yale Lock, illustrating how these devices can work together for enhanced front door security.
Maintenance
Regular maintenance ensures optimal performance and longevity of your Nest Doorbell.
- Cleaning: Gently wipe the camera lens and the doorbell's exterior with a soft, damp cloth. Avoid abrasive cleaners or harsh chemicals.
- Software Updates: Ensure your Nest app and doorbell firmware are always up to date. Updates often include performance improvements, new features, and security enhancements. The Nest app will typically notify you of available updates.
- Connectivity Check: Periodically check your Wi-Fi connection strength near the doorbell to ensure stable streaming and alerts.
Troubleshooting
If you encounter issues with your Nest Doorbell, try the following troubleshooting steps:
- No Power/Offline:
- Check your circuit breaker to ensure power to the doorbell is on.
- Verify that the doorbell is securely connected to the wiring.
- Ensure your transformer meets the required voltage (8-24VAC or 16-24VAC as per compatibility chart).
- Poor Video Quality/Lag:
- Check your Wi-Fi signal strength at the doorbell's location. A weak signal can cause issues.
- Ensure your internet connection is stable and has sufficient bandwidth.
- Clean the camera lens as described in the Maintenance section.
- Notifications Not Received:
- Verify notification settings in the Nest app and on your mobile device.
- Ensure your phone has an active internet connection.
- Check if the doorbell is online in the Nest app.
- App Issues:
- Close and reopen the Nest app.
- Restart your mobile device.
- Ensure the Nest app is updated to the latest version.
For more detailed troubleshooting or persistent issues, visit the official Nest support website or contact customer service.
Specifications
| Feature | Detail |
|---|---|
| Model Number | NC5100US |
| Product Dimensions | 2.83 x 5 x 6.57 inches |
| Item Weight | 4.2 ounces |
| Power Source | Wired (requires compatible doorbell transformer) |
| Manufacturer | Nest Labs |
| First Available | February 4, 2018 |
| In the Box | Nest Hello Doorbell (NC5100US) |
Warranty and Support
For information regarding product warranty, technical support, or to access additional resources, please visit the official Nest support website. You can typically find detailed FAQs, troubleshooting guides, and contact options for customer service there.
Online Support: support.google.com/nest





