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Many thanks John. I do have the manual but to reset it I still need to enter the old user code to stop the tamper alarm, Also the so called reset link on the circuit board is this a switch or something I need to plug in? as you can imagine I am a bit wary to start messing around if the alarm is...

I have recently moved house and the new property is fitted with an old yale 2000/2500 alarm system. unfortunately the previous owner did not tell us their user code and now after a local power cut we are getting a fault and low battery alarm on the control unit, I cannot open the box up for fear...