Remove a Sterling 10 alarm

10 Mar 2021
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United Kingdom
I wish to remove a Sterling 10 house alarm, and was wondering if there is any set procedure to do this and avoid setting the alarm going off, i.e with the system dis-armed can i just isolate it from the mains supply and then just start disconnect the wires etc.
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Power down mains and battery disconnect bell box battery if fitted or working , remove wiring ..
When i turn the mains power off the outside alarm is set off, even though the control panel says the system is disarmed is that usual ?
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ok thanks for the help & sorry for what may sound dumb questions, i am a bit new to the workings of alarms.
The only problem sometimes is what happens to what is supposed to happen ...
Eg power down a system and the external should ring !

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