I built a new home and was so excited to install this faucet - IT IS THE WORST!!!!  It has never worked correctly from day one.  It will run for a few minutes maybe go on and off - I thought it was my hand in front of sensor but then it shuts off as if to cool down and after 20 minutes if you are lucky you can turn it back on.  I have to do whatever I am doing at kitchen sink very quickly so I don't lose the water - IT IS DRIVING ME ABSOLUTELY CRAZY.  I have replaced batteries, had the builder look at it - NOTHING.  Do not recommend.