I have a Flow motion sensing fauced. It quit on me recently. I replaced the batteries but it still did not work. BTW I hear the click when I wave my hand but no water flowing. Tried without batteries did not work. I then connected the pipes going through the solenoid together so the mechanism(solenoid) to turn water on/off does not come into picture but still did not help.

I checked that water is coming to the final pipe that connects to the pull-down. So I am suspecting something blocked in the pull down. What could it be?