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It's the voltage across the sensor, measured either at the sensor itself or at the alarm main cuircuit. Is 4.1-4.2v normal or is that perhaps indication of earth short? Doesn't look like the tamper circuits are connected (only 2 wires go to the door), but I'll check that again. The zone seems...

Hi - Ive got an accenta optima g3 system which I'm tying to fix: One day the door sensor stopped working (cant be used to set the alarm, and no longer worked when tested in 'chime' mode). I've tried a few things but cant work out how to fix it. Does anyone have any ideas? Although the old...