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 QS5210-840 carbon monoxide detector, follow the instructions below.
1. Twist sensor counter-clockwise to remove from base.
2. Close the sensor by aligning with the backplate and twisting clockwise, ensuring the tamper switch is pressed and the sensor is securely closed.
You will also need to clear the error from the panel memory by following these instructions: IQ Panel 2 - System Sensor Status.