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How to Reset a Scantronic 9851 Alarm

Updated February 21, 2017

A Scantronic 9851 alarm system has a control panel with an LCD display, at least one keypad and different detectors installed throughout the location. Before you can program or use the system, you have to enter an access code. Alarms go off if a sensor detects someone breaking in, if there is a fire, or if a user activates a panic alarm, a medical assistance alarm or a fire alarm. If there is a problem with the alarm, or if an alarm has been activated and you want it to stop, you can reset the 9851 using three different methods.

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  1. Look at the LCD display, taking note that the wrench icon is dark.

  2. Press the keypad numbers to enter your access code.

  3. Press the check mark icon button. The display clears and the system resets.

  4. Look at the LCD display, noting that the wrench icon is glowing. If your alarm is connected by a telephone line to an alarm receiving centre, you may be able to do a remote reset, or your alarm company may have to send an engineer out to your home to check your system and reset it.

  5. Press the keypad numbers to enter your access code. The display will read, "Select?"

  6. Press the button marked with a check mark icon. The display will show a four-digit reset code. Write down the code on a piece of paper. The code will display for 30 seconds. If you miss it, enter your code and press the check mark icon button again.

  7. Call your alarm company's alarm receiving centre. The company will ask you some questions to verify that you are who you say you are. They will ask you about the alarm you're calling about to reset, and they will then request the reset code that you wrote down. If the company doesn't need to send an engineer out to check your system and reset it, they will tell you an "Anti Code."

  8. Type in the numbers of the "Anti Code" on the keypad. The display will clear and the service light will go off. The system is now reset.

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About the Author

Julius Vandersteen has been a freelance writer since 1999. His work has appeared in “The Los Angeles Times,” “Wired” and “S.F. Weekly.” Vandersteen has a Bachelor of Arts in journalism from San Francisco State University.

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