1. Introduction
The Leakbee YC302 Carbon Monoxide (CO) Detector is designed to monitor carbon monoxide levels and provide audible and visual alerts in the event of dangerous concentrations. Carbon monoxide is a colorless, odorless, and tasteless gas that can be fatal when inhaled. This manual provides essential information for the proper installation, operation, and maintenance of your CO detector to ensure its effective performance and your safety.
2. Safety Information
Read all instructions carefully before installation and operation. Keep this manual for future reference. This device is intended for detecting carbon monoxide gas from various sources such as furnaces, water heaters, gas stoves, and vehicle exhaust. It is not designed to detect smoke, fire, or other gases.
2.1 Potential Sources of Carbon Monoxide
Carbon monoxide can be produced by any fuel-burning appliance or engine. Common sources include:
- Cars left running in attached garages
- Portable generators
- Operating grills indoors or in garages
- Improperly installed kitchen ranges or vents
- Gas or wood-burning fireplaces
- Water heater vent pipes
- Portable kerosene or gas heaters
- Cracked or loose furnace exchangers

Figure 1: Potential Sources of Carbon Monoxide
2.2 Important Warnings
- Do not paint the detector. Paint can clog the vents and interfere with sensor operation.
- Do not block the air vents on the detector.
- This detector requires a continuous power supply (110V-220V AC) to operate. It does not have a battery backup.
- Regularly test the detector as described in the Maintenance section.
3. Product Overview
The Leakbee YC302 is a compact, plug-in carbon monoxide detector featuring a digital LED display and an audible alarm. Its design allows for easy integration into various environments.

Figure 2: Detector Components and Dimensions

Figure 3: Key Features
3.1 Key Features
- Digital LED Display: Shows real-time carbon monoxide concentration in parts per million (PPM).
- Audible Alarm: Emits an 85-decibel warning sound when CO levels reach dangerous thresholds.
- Visual Alarm: Indicator lights (POWER, FAULT, ALARM) provide status at a glance.
- Test/Mute Button: Allows for manual testing of the alarm and silencing false alarms.
- Plug-in Design: Directly plugs into a standard 120V outlet for continuous monitoring.
4. Installation
The Leakbee YC302 Carbon Monoxide Detector is designed for simple plug-in installation.
4.1 Placement Guidelines
For optimal detection and safety, consider the following placement guidelines:
- Install at least one CO detector on each level of your home, especially near sleeping areas.
- Place detectors in rooms with fuel-burning appliances (e.g., kitchen, furnace room).
- Avoid placing the detector in direct sunlight, near heating/cooling vents, or in areas with high humidity.
- Ensure the detector is not obstructed by furniture, curtains, or other objects.
- The plug-in design allows for flexible placement in any standard 120V outlet. The folding prongs allow for the detector to be oriented to avoid blocking the second outlet.

Figure 4: Plug-in Installation Example

Figure 5: Home Safety Product Placement Guide
4.2 Initial Power-Up
- Plug the detector into a standard 120V AC electrical outlet.
- Upon initial power-up, the detector will perform a self-test. The digital display will cycle through segments, and the alarm may sound briefly. This indicates proper functioning.
- Once the self-test is complete, the green POWER indicator light will illuminate, and the display will typically show "0 PPM" under normal, CO-free conditions.
5. Operating Instructions
5.1 Normal Operation
During normal operation, the green POWER indicator light will be steadily lit. The digital display will show "0 PPM" if no carbon monoxide is detected. The detector continuously monitors the air for CO.
5.2 Test Function
To test the detector, press and hold the Test/Mute Button (located on the side or front, as shown in Figure 2) for approximately 3 seconds. The alarm will sound, and the display will show a test value (e.g., "8888" or a high PPM reading). Release the button to stop the test. This confirms the alarm and display are functioning correctly.
5.3 Alarm Conditions and Responses
The detector is programmed to alarm at specific CO concentration levels and durations:
- CO Concentration ≥ 80 PPM: The corresponding concentration will be displayed on the digital screen.
- CO Concentration ≥ 150 PPM: A loud audible alarm (85 dB) will sound, and the red ALARM indicator light will flash.

Figure 6: CO Detection and Alarm Thresholds
The effects of carbon monoxide exposure vary with concentration and duration:
- 100 PPM: Slight headache within 2 to 3 hours.
- 200 PPM: Slight headache within 2 to 3 hours, loss of judgment.
- 400 PPM: Frontal headache within 1 to 2 hours.
- 800 PPM: Dizziness, nausea, cramps in 45 minutes; death within 2 to 3 hours.

Figure 7: Effects of CO Concentration on Health
5.4 What to Do When the Alarm Sounds
- Immediately move to fresh air outdoors or open all doors and windows to ventilate the area.
- Do a head count to check that all persons are accounted for.
- Do not re-enter the premises until the CO alarm has stopped and the area has been thoroughly ventilated.
- Call the fire department or a qualified technician to investigate the source of the carbon monoxide.
- If the alarm sounds again, repeat steps 1-4.
5.5 Mute Function
In the event of a nuisance alarm (e.g., from temporary, low-level CO exposure during cooking), you can press the Test/Mute Button to temporarily silence the audible alarm for a short period. The detector will continue to monitor CO levels. If CO levels remain high, the alarm will reactivate.
6. Maintenance
Regular maintenance ensures the continued reliability of your CO detector.
- Weekly Test: Press the Test/Mute button weekly to ensure the alarm and display are functioning.
- Monthly Cleaning: Gently vacuum or wipe the exterior of the detector, especially around the air vents, to remove dust and debris. Do not use cleaning sprays or solvents.
- Avoid Obstructions: Ensure that nothing is blocking the air vents of the detector.
7. Troubleshooting
If your detector is not operating as expected, refer to the following common issues:
| Problem | Possible Cause | Solution |
|---|---|---|
| No display, no lights | No power | Check if the outlet has power. Try plugging into a different working outlet. |
| Display shows "ERR" | Sensor fault or malfunction | Unplug the detector for 30 seconds and plug it back in. If "ERR" persists, the unit may be faulty and needs replacement. |
| Alarm sounds without visible CO source | Low-level CO, dust, or humidity interference | Ventilate the area. Press the Mute button. Clean the detector. If alarms persist, investigate potential hidden CO sources. |
| Green POWER light off, other lights on | Unit fault | Unplug and replug. If the issue continues, the unit may be faulty. |

Figure 8: "ERR" Display Indicating a Fault
8. Specifications
| Feature | Specification |
|---|---|
| Model Number | YC302 |
| Brand | Leakbee |
| Power Source | 110V~220V AC |
| Alarm Type | Visual & Audible Alarm |
| Audible Alarm Level | ≥ 85 dB |
| CO Detection Range | 0-1000 PPM |
| Operating Humidity | ≤ 80%, non-condensing |
| Material | Plastic |
| Product Dimensions (D x W x H) | 9.5D x 9.5W x 4H Centimetres (approx. 3.74 x 3.74 x 1.57 inches) |
| Colour | White |
| UPC | 717331791124 |
| Country of Origin | China |
9. Warranty and Support
9.1 Manufacturer Warranty
This Leakbee YC302 Carbon Monoxide Detector comes with a 2-Year Manufacturer Warranty from the date of purchase. This warranty covers defects in materials and workmanship under normal use.
9.2 Customer Support
For any questions, technical assistance, or warranty claims, please contact Leakbee customer support:
- Email: support@yeezou.com
- Manufacturer: Shenzhen Yeezou Technology Co., Ltd
- Address: 15 Shunfeng Road, Baoan District, Shenzhen, 518000, China