1. Introduction
This manual provides important information regarding the installation, operation, and maintenance of your Ecoey FJ127 Carbon Monoxide (CO) Detector. Please read this manual thoroughly before installation and keep it for future reference. This device is designed to detect carbon monoxide gas and alert occupants to its presence.
Important: This CO detector is not designed to detect smoke, fire, or other gases. It is not a substitute for a smoke detector.
2. Safety Information and Warnings
- Installation: Install the detector according to the instructions provided. Improper installation may affect performance.
- Testing: Test the detector weekly to ensure proper operation.
- Battery: Use only the specified replaceable 1.5V AA batteries. Replace batteries promptly when the low battery warning sounds.
- Alarm Response: If the alarm sounds, evacuate all occupants immediately and call emergency services. Do not re-enter the premises until it has been deemed safe by professionals.
- Maintenance: Do not paint the detector. Do not block the alarm's openings. Clean the detector regularly as instructed.
- Placement: Avoid placing the detector in areas with high humidity, extreme temperatures, or near combustion appliances, vents, or fans that could interfere with CO detection. Refer to the placement guide for optimal locations.
3. Package Contents
Verify that all items are present in your package:
- Ecoey FJ127 Carbon Monoxide Detector
- Mounting Bracket
- Screws and Wall Plugs
- User Manual (this document)
- 2 x 1.5V AA Batteries (pre-installed or included)

Image: Contents of the Ecoey FJ127 Carbon Monoxide Detector package, showing the detector unit, user manual, and mounting accessories.
4. Product Features
- Advanced Electrochemical Sensor: Provides accurate and rapid detection of carbon monoxide.
- 10-Year Sensor Life: Ensures long-term protection.
- Replaceable Battery: Operates on 2 x 1.5V AA batteries, offering continuous protection even during power outages.
- Humanized Alarm Sound: Starts with a lower volume (below 85 dB) for approximately 10 seconds before escalating to a full alarm (above 85 dB) to prevent sudden startling.
- LED Indicator: Clearly displays operational status (Green for normal, Yellow for fault, Red for alarm).
- Test & Silence Button: Allows for easy weekly testing and silencing of false alarms.
- Compact Design: Discreet and easy to integrate into various home environments.

Image: An exploded view of the Ecoey FJ127 detector, illustrating its internal components and emphasizing the 10-year sensor life.

Image: The Ecoey FJ127 detector next to a cube, with its dimensions (4.7in W x 3.2in H x 1.5in D) overlaid, demonstrating its compact design.
5. Setup and Installation
5.1 Battery Installation
- Open the battery compartment cover on the back of the detector.
- Insert two 1.5V AA batteries, ensuring correct polarity (+/-).
- Close the battery compartment cover securely. The detector will emit a short beep and the green LED will flash, indicating it is powered on.

Image: A visual guide demonstrating how to open the battery compartment and insert two 1.5V AA batteries into the Ecoey FJ127 detector.
5.2 Mounting Location
For optimal performance and safety, consider the following guidelines for detector placement:
- Install at least one CO detector on each level of your home, especially near sleeping areas.
- Place the detector at least 5 feet (1.5 meters) away from fuel-burning appliances to avoid false alarms.
- Avoid dead air spaces, such as the peak of a vaulted ceiling or in corners where air circulation is poor.
- Do not place near windows, doors, or vents where drafts could affect readings.
- The ideal height for installation is at eye level or higher, but at least 6 inches (15 cm) from the ceiling.

Image: A visual guide illustrating recommended placement for various home safety products, including carbon monoxide detectors, in different rooms of a house.

Image: The Ecoey FJ127 detector shown in two installation scenarios: wall-mounted and placed on a tabletop, demonstrating flexible placement options.
5.3 Mounting the Detector
- Once an appropriate location is chosen, use the mounting bracket as a template to mark the positions for drilling.
- Drill two holes and insert the wall plugs (if mounting into drywall or plaster).
- Secure the mounting bracket to the wall using the provided screws.
- Align the detector with the mounting bracket and twist clockwise until it locks securely into place.
6. Operating Instructions
6.1 LED Indicator Status
The LED indicator provides visual cues about the detector's status:
- Green LED: Flashes once every 30 seconds – Indicates normal operation.
- Yellow LED: Flashes and beeps – Indicates a fault or low battery. Refer to the Troubleshooting section.
- Red LED: Flashes rapidly and alarm sounds – Indicates carbon monoxide detection.

Image: A clear depiction of the Ecoey FJ127 detector's LED panel, explaining that green signifies power, yellow indicates a fault, and red signals an alarm.
6.2 Alarm Sound Pattern
The alarm features a humanized sound pattern:
- Upon initial CO detection, the alarm will sound at a lower volume (below 85 dB) for approximately 10 seconds.
- After the initial 10 seconds, the alarm will escalate to its full volume (above 85 dB) to ensure occupants are alerted.

Image: A person in a room with the Ecoey FJ127 detector, demonstrating the "Never Scare You" feature where the alarm starts at a lighter sound before reaching 85dB.
6.3 Test/Silence Button
- Testing: Press and hold the "TEST/SILENCE" button for a few seconds. The detector will sound the alarm and flash the red LED, confirming it is functioning correctly. Release the button to stop the test.
- Silencing: If the alarm sounds due to a known, temporary CO source (e.g., a car running briefly in an attached garage), you can press the "TEST/SILENCE" button to temporarily silence the alarm for a short period. The detector will re-evaluate CO levels after the silence period. If CO levels persist, the alarm will reactivate.
7. Maintenance
7.1 Weekly Testing
It is recommended to test your CO detector weekly to ensure its proper operation. Press and hold the "TEST/SILENCE" button until the alarm sounds. If the alarm does not sound, refer to the Troubleshooting section.
7.2 Battery Replacement
The detector will emit a yellow LED flash and a chirp sound every 30 seconds when the batteries are low. Replace the two 1.5V AA batteries immediately. Refer to Section 5.1 for battery installation instructions.
7.3 Cleaning Your Detector
Clean the detector at least once a month to remove dust and debris. Use a soft, damp cloth to wipe the exterior. Do not use cleaning agents, solvents, or paint on the detector, as these can damage the sensor or interfere with its operation.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Detector does not power on. | Batteries are not installed or are installed incorrectly. | Ensure batteries are correctly installed with proper polarity. Replace with new batteries if necessary. |
| Yellow LED flashes and chirps. | Low battery or detector fault. | Replace batteries. If the issue persists, the detector may have a fault and needs replacement. |
| Alarm sounds (Red LED flashes). | Carbon Monoxide detected. | Evacuate immediately and call emergency services. Do not re-enter until cleared by professionals. |
| False alarms. | Detector placed too close to combustion sources, high humidity, or strong fumes. | Relocate the detector according to placement guidelines. Press the Test/Silence button to temporarily silence. |
| Test button does not work. | Detector fault or dead batteries. | Replace batteries. If still unresponsive, the detector may be faulty and needs replacement. |
9. Specifications
| Model: | FJ127 |
| Sensor Type: | Electrochemical |
| Power Source: | 2 x 1.5V AA Batteries (Replaceable) |
| Sensor Life: | 10 Years |
| Alarm Volume: | >85 dB at 3 meters (10 feet) |
| Operating Temperature: | 0°C to 50°C (32°F to 122°F) |
| Operating Humidity: | 10% to 95% RH (non-condensing) |
| Product Dimensions: | 1.46"D x 4.73"W x 3.18"H |
| Material: | Plastic |
| Color: | White |
10. Warranty and Support
Ecoey provides a limited warranty for this product against defects in materials and workmanship under normal use. For specific warranty terms, duration, and to register your product, please visit the official Ecoey website or contact customer support.
For technical support, troubleshooting assistance, or to inquire about warranty claims, please contact Ecoey customer service:
- Website: Visit the Ecoey Store on Amazon (for general product information)
- Email: Refer to your product packaging or the Ecoey website for the most current contact information.
Please have your model number (FJ127) and purchase date available when contacting support.
