Netatmo NCO-DE

Netatmo Smart Carbon Monoxide Detector (NCO-DE) User Manual

Model: NCO-DE

1. Introduction

The Netatmo Smart Carbon Monoxide Detector is designed to monitor carbon monoxide (CO) levels from fuel-burning appliances such as boilers, fireplaces, stoves, and gas cookers. Carbon monoxide is an invisible, odorless, and potentially fatal gas. This device provides real-time alerts to ensure your safety.

Upon detection of carbon monoxide, the detector activates an 85 dB alarm and sends a real-time notification to your smartphone. This feature is crucial for alerting you and your emergency contacts, even when you are away from home.

The detector features a 10-year battery life, matching the maximum lifespan of carbon monoxide detectors, eliminating the need for frequent battery changes. An integrated auto-test function continuously verifies the device's operational status, notifying you via smartphone if any issues arise. This connected device operates autonomously, requiring no additional smart home hub or hidden fees. Installation is quick and simple, involving wall-mounting. For full functionality, download the Home + Security application after installation.

2. Safety Information

Please read all safety instructions carefully before installing and using the Netatmo Smart Carbon Monoxide Detector. Failure to follow these instructions may result in property damage, injury, or death.

  • This device is designed to detect carbon monoxide gas. It is not a smoke detector or a fire alarm.
  • Install the detector in accordance with local regulations and the guidelines provided in this manual.
  • Do not paint the detector or obstruct its vents, as this can impair its function.
  • Test the detector regularly as described in the "Operating" section.
  • The 10-year battery is integrated and not user-replaceable. The device should be replaced after 10 years of operation.
  • If the alarm sounds, evacuate the premises immediately and contact emergency services.

3. Package Contents

Ensure all items are present in the package:

  • 1 x Netatmo Smart Carbon Monoxide Detector with integrated 10-year battery
  • 1 x Wall mount bracket
  • 2 x Screws
  • 2 x Wall plugs
  • 1 x User Manual (this document)

4. Setup and Installation

Follow these steps for proper installation and initial setup:

  1. Choose a Location: Install the detector in rooms containing fuel-burning appliances (e.g., kitchen, utility room, garage). Place it on a wall, at least 1.5 meters (5 feet) from any fuel-burning appliance, and at a height between 1.5 and 3 meters (5 to 10 feet) from the floor. Avoid placing it near windows, doors, or ventilation openings, or in direct sunlight.
  2. Mount the Bracket: Use the provided screws and wall plugs to securely attach the wall mount bracket to your chosen location.
  3. Attach the Detector: Align the detector with the wall mount bracket and twist it clockwise until it clicks into place. The detector will automatically power on.
  4. Download the App: Download the "Home + Security" app from your smartphone's app store (available for iOS and Android).
  5. Pair with App: Open the app and follow the on-screen instructions to add your new Netatmo Smart Carbon Monoxide Detector. This typically involves using Bluetooth to connect and then providing your Wi-Fi network details.
  6. Initial Test: Perform an initial test through the app to ensure the alarm sounds and notifications are received.
Netatmo Smart Carbon Monoxide Detector mounted on a wooden wall in a kitchen.

Image: The Netatmo Smart Carbon Monoxide Detector is shown mounted on a dark wooden wall, blending into a modern kitchen environment with a sink and stove visible in the background.

5. Operating the Detector

5.1 Normal Operation

Once installed and configured, the detector continuously monitors carbon monoxide levels. A small LED indicator on the device will periodically flash green to indicate normal operation.

5.2 Alarm Activation

If carbon monoxide is detected at dangerous levels, the detector will:

  • Emit a loud 85 dB audible alarm.
  • Send an immediate notification to your smartphone via the Home + Security app.

Action in case of alarm: If the alarm sounds, open windows and doors, evacuate all occupants from the building, and call emergency services from a safe location. Do not re-enter the building until it has been declared safe by professionals.

5.3 Auto-Test Function

The detector performs automatic self-tests to ensure its components are functioning correctly. If an issue is detected, you will receive a notification on your smartphone.

5.4 Manual Test

You can manually test the detector at any time through the Home + Security app. This will activate the alarm for a short period and confirm that the device is working.

6. Maintenance

The Netatmo Smart Carbon Monoxide Detector requires minimal maintenance:

  • Cleaning: Gently wipe the exterior of the detector with a soft, dry cloth. Do not use cleaning agents, solvents, or abrasive materials. Do not spray anything directly onto the detector.
  • Battery: The integrated battery has a 10-year lifespan. The device will notify you via the app when the battery is nearing the end of its life or when the 10-year operational period is complete. At this point, the entire unit must be replaced.
  • Regular Checks: Periodically check the LED indicator for normal operation (green flash). Perform manual tests via the app monthly.

7. Troubleshooting

If you encounter issues with your Netatmo Smart Carbon Monoxide Detector, refer to the following common problems and solutions:

Problem Possible Cause Solution
No smartphone notifications
  • App not installed or configured.
  • Wi-Fi connection lost.
  • Smartphone notification settings disabled.
  • Ensure the "Home + Security" app is installed and the detector is paired.
  • Check your Wi-Fi router and internet connection. Reconfigure Wi-Fi in the app if necessary.
  • Verify notification permissions for the app in your smartphone settings.
Detector not responding to manual test
  • Low battery.
  • Device malfunction.
  • Check battery status in the app. If low, the device may need replacement.
  • Contact Netatmo support if the issue persists after checking battery and app connection.
False alarms
  • Incorrect placement (e.g., too close to a stove or exhaust).
  • Dust or debris obstructing sensor.
  • Review installation guidelines and relocate the detector if necessary.
  • Gently clean the detector's exterior.

For further assistance, please refer to the support section.

8. Specifications

Model Number NCO-DE
Manufacturer Netatmo
Dimensions (L x W x H) 10 x 2.3 x 10 cm (3.94 x 0.91 x 3.94 inches)
Weight 150 grams (0.33 lbs)
Power Source Integrated 2 Lithium-ion batteries
Battery Life 10 years (non-replaceable)
Alarm Sound Level 85 dB
Connectivity Wi-Fi, Bluetooth Low Energy (BLE)
Operating Humidity 10% to 90%
Compatible Devices Smartphones (iOS, Android), Tablets (iOS, Android)
Certifications EN 50291, NF

9. Warranty and Support

For warranty information, please refer to the documentation provided with your purchase or visit the official Netatmo website.

If you require assistance with installation, application usage, or troubleshooting, please consult the Netatmo Help Center or contact customer support:

© 2026 Netatmo. All rights reserved.

Ask a question about this manual

Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.

After a successful submission, we securely hash the supplied account or form email before sending it to Microsoft Advertising for conversion attribution. Privacy details.