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I recently reset my Scantronic alarm and have renewed the battery as this was several years old. Having relearned the sensors, the alarm sets correctly but when the sensor is triggered, the outer alarm box and strobe aren't activated and instead the internal alarm makes a weird squarking noise...

I've had a Scantronic 500r alarm for many years now and usually carry out replacement batteries in all sensors without an issue. However on removing the door sensor it triggered the tamper on the control panel and as I was struggling to realign the 3 metal prongs into the casing of the sensor...