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Thanks yaleguy3. My thread got a little distorted due to others adding their'contributions'. I have had no issues with batteries at all. I will try the things you suggested, so thank you for your input.

I installed a Yale 6400 a couple of months ago without any problems. I have recently experienced the same problem three times - when I try to disarm the system by pressing the green button, none of the access codes (I have 3 in the system) are accepted. As a result, after the countdown period...