How do you change an alarm code on Honeywell LYNXR-2?
While the Honeywell LYNXR-2 wireless alarm control panel is discontinued and no longer in production, many homes may still have a LYNXR-2 installed. While we would highly recommend upgrading your existing LYNXR-2 to the new L5210 LYNX Touch wireless alarm control panel, which would work with all of your existing 5800 series wireless sensors, you may want to continue to use what is there already. Unfortunately, more often than not, when you buy a house that already has a home security system, you may not have the information needed to operate the system. Without a valid master code, you will not be able to arm or disarm your LYNXR-2 wireless alarm control panel.
There are two ways to set a new master code, which is user code number (02). The first option requires you to know the current master code and in this example is not that relevant. However, if you happen to know the existing master code, you press the current (4) digit master code followed by the 'Code' key which is the  key. Then press  and enter a new (4) digit master code. You must enter the new (4) digit master code a second time to finalize the code change.
Existing Master Code +  +  + [New Code] + [New Code]
If you don't know the current master code, the only way to change the code is by using the installer code. You would enter the (4) digit installer code followed by the 'Code' key and  and then enter the new desired (4) digit master code. In this scenario, you only have to enter the new master code once.
Installer Code +  +  + [New Master Code]
Of course, you may not know the installer code either. If that's the case you can power down the LYNXR-2 wireless alarm control panel by removing the internal battery backup and unplugging the transformer, you can then enter programming mode by powering the system back up and, within (50) seconds, pressing the [*] and [#] keys together. Field (20) will be displayed. If you press the [#] , the current (4) digit installer code will be displayed as (4) sequential (2) digit hexadecimal numbers. For example, if the Installer Code is (4110), it will display (04) beep, (01) beep, (01) beep, (00) beep, beep, beep. The triple beep lets you know this is the final entry in the field. If you want to change the installer code, press [*]  and enter a new 4 digit code. You'll ear a beep after each digit you enter, and a triple beep after the final digit. Once you've noted or changed the Installer Code, press *99 to exit programming mode, and then use the installer code to change the master code. If you had to power down to enter programming, be sure the battery is reconnected once you're finished.
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