How to Resolve a Tamper Condition on a QS1135-840 Door/Window Sensor
Follow the below instructions to replace the cover on your sensor which will resolve the tamper error.
A tamper error is when the sensor reads that the cover is not fully secured, which is detected by a spring that must be depressed for the cover to read closed.
You will also need to clear the error from the panel memory. Once the cover has been replaced, see instructions for IQ Panel 2 - System Sensor Status.
Qolsys QS1135-840 Door/Window Sensor:
Align the cover over the sensor and press to close. Ensure the tab snaps securely into place.