A tamper error occurs when the panel is reading that the sensor's cover is not attached properly. To address the tamper error on your QS1431-840 glassbreak sensor, follow the instructions below.
1. Press the tab on the top edge of the device.
2. Pull the cover towards you, flipping the cover downward.
3. Flip the sensor upwards and press to close, ensuring the bottom tab snaps into place.
You will also need to clear the error from the panel memory by following these instructions: IQ Panel 2 - System Sensor Status.