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I recently installed an E3 in my home and today went to activate the remote sensor. It all set up fine but there is a difference in the temperature reading. At first I thought it was because I was holding it. So I balanced it on top of the main unit and it has been consistently reading 4 degrees Fahrenheit higher then the main unit. I do not have a external thermostat to test but I believe the sensor to be the one that is incorrect just by feel of the room. Is this a bad sensor or is there a way to calibrate it.