What to do if Radio Shack 49-2551A does not play back message?
- RRonald OneillSep 9, 2025
If your Radio Shack Security System console does not play back any message when the phone is answered, check that you have recorded a message.

What to do if Radio Shack 49-2551A does not play back message?
If your Radio Shack Security System console does not play back any message when the phone is answered, check that you have recorded a message.
Why does Radio Shack 49-2551A arm or disarm by itself?
The Radio Shack Security System might arm or disarm by itself if a neighbor has a compatible system. To resolve this, re-install the system using a different house code.
How to fix Radio Shack 49-2551A motion detector false alarms?
To prevent false alarms with your Radio Shack Security System's motion detector: * Do not place the motion detector near an air conditioning or heating vent. * Avoid placing it in direct sunlight. * If it's detecting pets, place the detector at a height of 6 feet, or set the switch on the back to 2 so it is less sensitive.
What to do if Radio Shack 49-2551A zone indicator flashes slowly?
If a zone indicator on your Radio Shack Security System is flashing slowly, it means one of the sensors or motion detectors hasn't reported in during the past 4 hours. Check the battery in the sensor or motion detector and replace it if needed, or bypass the zone.
What does ARMED flashing mean on Radio Shack 49-2551A?
If 'ARMED' is flashing on your Radio Shack Security System, it indicates that there has been an intrusion. If a zone indicator is also on, it shows which zone was violated. To stop the flashing and turn off the zone indicator, press the LIGHT ON or OFF button on a remote control. If no zone indicator is on, the violated zone is within zones 9-16; press BYPASS on the console to see which zone was tripped.
What to do if Radio Shack 49-2551A Security System zone indicator flashes rapidly?
A zone indicator flashes rapidly on your Radio Shack Security System if you pressed BYPASS on the console to arm the system while a sensor or motion detector was reporting a problem. Correct the problem; the zone arms automatically when the problem is corrected.
Why Radio Shack Security System doesn't trip alarm when opening door?
If your Radio Shack Security System doesn't trip the alarm when you open a door or window, check to see if the system is armed. Also, be sure INSTALL/RUN 1/RUN 2 on the console is set to RUN1 or RUN 2. Press TEST on the wireless sensor transmitter and see if the alarm trips. If the alarm does not trip, see if the sensor indicator comes on when you press TEST. If the indicator does not come on, replace the battery and re-initialize the sensor, if necessary.
What does BATTERY LOW mean on Radio Shack 49-2551A?
If 'BATTERY LOW' is displayed on your Radio Shack Security System console, install or replace the console’s battery.
What to do if Radio Shack Security System does not dial out?
To solve the issue of your Radio Shack Security System not dialing out, check that you have stored a phone number and that the console is armed.
How to fix Radio Shack 49-2551A when lights won't turn on/off using remote?
If you cannot turn lights on or off using the LIGHT ON or LIGHT OFF buttons on the remote of your Radio Shack Security System: * Make sure you set the house and unit code on the module(s) to the same letter and number as the console. * If you have more than one console, ensure that you set both to the same house and unit code. * Be sure the light you are trying to control is plugged in and has its on/off switch in the on position, and that its bulb is good. * Plug the module into another outlet on the same electrical circuit as the console. * Check that the battery indicator on the remote control comes on when you press a button. Replace the battery and re-initialize the remote control, if necessary.
| Frequency | 315 MHz |
|---|---|
| Type | Wireless Security System |
| Components | door/window sensors, motion detector |
| Power Source | AC adapter with battery backup |
| Battery Life | Approximately 1 year |
Details the key components included and their basic functions within the security system.
Describes the function and purpose of the wireless sensor transmitters.
Explains the features and operation of the handheld remote control.
Details the functions and operation of the keychain remote control.
Provides instructions on how to operate the lamp module.
Explains the role and application of the motion detector.
Highlights the advantages of the system's compatibility with Plug 'n Power accessories.
Describes the system's supervised operation feature.
Details the features and functions of the built-in telephone dialer.
Provides crucial information and recommendations to consider before beginning the installation process.
Outlines FCC requirements and advice for proper system connection and operation.
Offers solutions for common issues encountered with the security system's operation.
Provides instructions on how to properly care for the system to ensure longevity and performance.
Explains how to assign unique codes to sensors and detectors for zone identification.
Details the process for modifying or reassigning existing security codes for system accessories.
Provides step-by-step instructions for initial console setup, including location and basic settings.
Guides users through the process of installing batteries and pairing the keychain remote.
Details the physical installation process for wireless door/window sensors.
Explains how to adjust the motion detector to reduce false alarms caused by pets.
Guides users on how to test the motion detector's detection capabilities.
Explains how the dialer works and its notification functions.
Details how to enter and store phone numbers for the dialer to call.
Explains the methods and procedures for arming and disarming the security system.
Differentiates between the two arming modes and their specific uses.
Describes how the system handles entry/exit delays for arming and disarming.
Explains how to activate the panic alarm for immediate alerts.
Details the meaning of various zone indicator lights on the console.
Explains how to interpret the status lights for zones 1 through 8.
Provides steps to resolve issues indicated by trouble alarms.
Explains how to interpret zone status indicators for zones 9 through 16.
Explains the meaning of various status lights on the console.
Details what happens during an alarm and immediately after it is disarmed.
Guides on using remote controls to operate plugged-in devices.
Explains how to turn lights on/off remotely using the security light feature.
Details how to adjust the brightness of connected lights.
Provides steps to clear all settings and return the console to its factory defaults.
Provides solutions when the system cannot be armed.
Addresses issues where a zone indicator flashes slowly, indicating a problem.
Explains why a zone indicator might flash rapidly and how to resolve it.
Offers solutions for recurring trouble alarms that prevent arming.
Provides steps to prevent the alarm from tripping before disarming.
Troubleshoots problems with controlling Plug 'n Power modules via remote.
Offers solutions when sensors fail to trigger the alarm.
Addresses problems where no chime is heard during remote installation.
Troubleshoots situations where no chime occurs when testing sensors.
Explains how to resolve the battery low indicator.
Provides guidance on what to do if a remote control is lost.
Offers solutions for the system arming or disarming unexpectedly.
Troubleshoots lights that remain on during remote or sensor installation.
Explains the meaning of the ARMED indicator flashing.
Identifies common causes for false alarms from motion detectors.
Troubleshoots issues with the telephone dialer not calling or playing messages.
Provides steps to address situations where the console appears to be locked up.
Details the procedure for replacing the console's internal backup battery.
Guides users on replacing batteries in the system's remote controls.
Explains how to replace batteries in wireless sensors and detectors.
Discusses potential interference from intercom systems on the security system.
Lists specific cautions related to FCC regulations and radio frequency interference.
Provides recommendations for protecting the system during electrical storms.