Although an old system, it was working perfectly until the internal alarm started to go off needlessly. The main alarm panel is in the loft and ever since we've been having some external sub zero temperatures the internal alarm started to trigger and the display on the keypad was showing "Battery Failure". It does get really cold in the loft as everything is insulated so I am wondering if this has anything to do with it? To be on the safe side I replaced the internal battery with a like for like one despite the previous one being changed about 1 1/2 years ago. (Yuasa NP& 12v 7.0AH)
However within a few weeks the same problem arose, whereby the alarm would trigger without it being armed with the same "Battery Failure" indicator on the keypad panel.
It may be a common fault but I may be missing something obvious and I would appreciate any help before making the decision to replace the whole system.
Many thanks