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WMproop Thanks for your answer.
Yes the brown was used on T. What I found out is that the fuse was blown so that is why it did not work. I replaced the fuse and now it is working properly.
I have...

I replaced the weathertron baystat240 with the honeywell 7400. Taped off the brown (T) cable and the rest went in their corresponding letters. After setting up the system nothing happens.
It does...