Why is the plug in tranformer fuse blowing on my security system?

I have had the home security alarm system for about 7 years with never an issue. Recently on the display, the word power was flashing, which per the book means there is low power to the system. I thought that maybe the back up battery needed to be replaced, so I did this. But before I could the whole system went off. I put the new battery in, but nothing. I then noticed that the green light on the plug in transfer wasn't lit leading me to believe that this is the issue. I purchased a brand new one exactly the same, brand, 16.5 VAC 40 VA, etc. When I went to plug it in, the green light came on ever so briefly and so did the alarm. The alarm stayed on but the light was out, I am on battery power because when you disconnect the battery it goes off. Does anyone know what is causing this because it destroys the transformer?

Asked By: AP - 9/15/2010
Best Answer - Chosen by Asker
Sounds like it's fried - and time for a new system. If it's monitored, you could call the alarm company for a hand. If it's not monitored, then shame on you... More
Answered By: Peter Rogers - 9/17/2010
Additional Answers (1)
There are 2 majors problems: 1)the bridge rectifier or the filter capacitor is bad 2)there is a shortcut in one of the sensors(if there are motions sensors on your alarm) or a shortcut in the main box of the alarm. Good luck!
Answered By: cezar t - 9/15/2010
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