SCO403 - Smoke detector FIRST ALERT - Free user manual and instructions
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| Product Type | Smoke Detector |
| Brand | First Alert |
| Model | SCO403 |
| Sensor Type | Photoelectric |
| Power Source | 9V Battery (included) |
| Battery Life | Up to 1 year under normal conditions |
| Dimensions | 5.5 inches diameter x 1.5 inches height |
| Weight | 0.5 lbs (without battery) |
| Audio Alarm | 85 dB at 10 feet |
| Test/Silence Button | Yes |
| Low Battery Indicator | Chirp every 30-60 seconds |
| End-of-Life Warning | Chirp pattern: 3 chirps every 30-60 seconds |
| Installation | Mounting bracket and screws included |
| Temperature Range | 40°F to 100°F (4°C to 38°C) |
| Humidity Range | Up to 95% relative humidity (non-condensing) |
| Maintenance | Clean with vacuum or soft brush monthly |
| Safety Certifications | UL listed, meets NFPA standards |
| Warranty | Limited 10-year manufacturer warranty |
| Replacement Parts | Battery only (user-replaceable) |
| Repair Information | Non-repairable; replace unit after 10 years |
Frequently Asked Questions - SCO403 FIRST ALERT
How do I install the SCO403 smoke detector?
Remove the mounting bracket from the detector. Mark and drill holes for the screws, then attach the bracket to the wall or ceiling. Insert a 9V battery into the compartment, ensuring the polarity matches. Twist the detector onto the bracket until it clicks into place. Press the test button to confirm operation.
What does a single chirp every 30-60 seconds mean?
A chirp every 30-60 seconds indicates a low battery. Replace the 9V battery immediately to maintain protection.
How can I silence a false alarm?
Press and hold the test/silence button for a few seconds. This will silence the alarm for approximately 15 minutes. If the alarm continues, clean the detector to remove dust or steam, and check for nearby sources of smoke or vapor.
Why does my detector chirp 3 times every 30-60 seconds?
Three chirps in a pattern indicate the detector is at end of life. First Alert recommends replacing the entire smoke detector every 10 years. Replace the unit immediately.
How do I clean the SCO403?
Use a vacuum cleaner with a soft brush attachment to gently clean the vents on the detector. Avoid using water, solvents, or spray cleaners as they may damage the sensor. Perform this monthly.
Can I paint the smoke detector?
No, painting the detector can block the vents and prevent smoke from entering the sensor. Never paint the detector. If the color is an issue, consider using a trim cover.
Where should I install the smoke detector?
Install on the ceiling or high on a wall, at least 10 feet from cooking appliances to avoid false alarms. For multi-story homes, install one on each level including the basement. Ensure it is not near windows, ducts, or fans.
What is the battery type for the SCO403?
It uses a standard 9V alkaline battery. For best performance, use a brand like Duracell or Energizer. Do not use rechargeable batteries.
How do I test the smoke detector?
Press and hold the test button for a few seconds. The alarm should sound loudly (85 dB). Release the button to stop the test. Test weekly.
What should I do if the alarm sounds and there is no smoke?
Check for common causes: cooking vapors, high humidity, or dust. Open windows or ventilate the area. Press the silence button. Clean the detector with a vacuum. If the problem persists, relocate the detector away from the source.
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