Is it communicating with the panel correctly when activated?
For the zone in question, what does it say in Engineer menu -> Diagnostics -> View inputs -> Wireless device status -> Signal strength -> Inputs? (Press the yes key during the countdown and activate the detector). What's the number? (1-3). After this, press yes then scroll to the detector, what's the number? (0-100)
Led status
Green -good signal strength
Red - poor signal strength
Blue - device active
Is magnet in correct position for the door contact ?
Relearn device next to control panel and check it works correctly,then if ok move to door.could be signal issue ?
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