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Thanks for your response JohnD, really appreciate it. I have changed all the batteries throughout the system, however I am unable to reach the Siren due to it being so high up on an external wall and my ladders not reaching! Currently in the process of acquiring bigger ladders but may not...

My Wife and I recently bought a house and the previous owners had a Yale HSA 3400 fitted some years ago that they never used, they gave us the pin and showed us how it works and it worked just fine, however now that we have bought the house it doesn't seem to work. I enter the pin and press...