I've done the searches and it says that I have to hold the button until a "C" appears. I've tried that but it never does. When I hold it, it will give me the "4" for my zone. It will also display the "00" with all of the segments lit up in the 0's but that's it. I have no reset button on the underside of my mirror either, unless I'm just looking in the wrong place.
Has anybody had any luck resetting theirs?