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Mend Gardtec 300 Series Security Alarm System

I need a code for a Gardtec 300 series alarm which was already installed?

I have a Gardtec 300 Series which was already installed when I bought my house. The Power light is green and Day indicator shows in red, no other lights are on. How do I reprogramme without the alarm code?

Richard
February 2009
GardtecGardtec 300 SeriesSecurity Systems, Home Alarm SystemsSecurity Alarm System

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Gardtec 300 Series Alarm: Reset Code & Reprogramming