To change the battery in your First Alert SC9120B, locate the battery compartment on the back of the unit. Open the compartment and remove the old battery. Insert a new 9-volt battery, ensuring the correct polarity (+ and -). Close the compartment and ensure it is securely fastened.

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My alarm went off [beeped] once last night. What is wrong? It was not a chirp and it did not repeat. One of 4 alarms has a flashing green light. Rest are solid green.

Can't find the answer to your question in the manual? You may find the answer to your question in the FAQs about the First Alert SC9120B below.

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Flight International Airport departs from San Francisco International Airport at 13:55 and arrives at Frankfurt Frankfurt Airport at 09:45.The flighttime is about 10h 50m. The distance travelled ("as the bird flies"): 14453 Km. So the average speed is roughly 1334 Km.There is an 9 hour time difference between San Francisco and Frankfurt

To interconnect multiple First Alert SC9120B units, connect them using the interconnect wiring provided. This allows all units to communicate with each other, so if one alarm detects a hazard, it will trigger all interconnected alarms to sound simultaneously. Follow the manufacturer's instructions and ensure proper installation to ensure reliable interconnect functionality.

View the manual for the First Alert SC9120B here, for free. This manual comes under the category not categorized and has been rated by 1 people with an average of a 7.5. This manual is available in the following languages: English. Do you have a question about the First Alert SC9120B or do you need help? Ask your question here

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The First Alert SC9120B is a combination smoke and carbon monoxide detector that is designed to keep your home safe from potential fires and harmful gas leaks. This device operates on two AA batteries and features electrochemical CO sensing technology to detect carbon monoxide, as well as an ionization smoke sensor to detect smoke particles. The First Alert SC9120B offers a "smart" system feature that allows it to interconnect with other compatible devices in your home, ensuring that all alarms will sound simultaneously in the event of an emergency. This makes it an ideal choice for larger homes or multi-level living spaces. Additionally, the device features a loud 85-decibel siren that will alert you to any detected issues. For added convenience, the First Alert SC9120B offers a single test/silence button that can be used for testing the device's functionality or silencing false alarms. Furthermore, the device features a low battery alert to ensure that it is always functioning properly. Overall, the First Alert SC9120B is a reliable and efficient device that offers superior protection from both smoke and carbon monoxide. Its smart system feature, loud siren, and easy-to-use buttons make it an excellent option for any homeowner looking to enhance their home's safety measures.

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To test the functionality of your First Alert SC9120B, locate the test button on the front of the unit. Press and hold the test button for a few seconds until the alarm sounds. Make sure you are prepared for the loud noise. If the alarm does not sound, check the battery or consult an expert for further assistance.

My alarm is flashing red. Per the manual that means it is silenced I did have a smoke detection a while back and I am guessing it started flashing then, but I did not silence it. How do "UNsilence" the alarm?

To silence false alarms on your First Alert SC9120B, locate the silence button on the front of the unit. Press and hold the silence button for a few seconds until the alarm stops. Remember, it is crucial to only silence the alarm if you are certain it is a false alarm. Investigate the cause of the alarm to ensure your safety.

Alarm went off no smoke no CO. Since then blinking green LED this unit which is steady green on other connected units. What is the solution?

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The recommended lifespan of the First Alert SC9120B is generally 10 years. After this period, it is advised to replace the unit entirely to ensure optimal performance and reliability. Regular testing and maintenance are still crucial during its lifetime.