The on off button presses down but not up and the a irflow does not go on. It is less than a year old and the construction men purchased it at Home Depot. Since they left no papers with me, is there any warranty on this tub?

This tub should certainly still be under warranty if it is less than a year old. With my business, I offer a one year warranty that is standard with all of my installs. You may want to try your contractor first to see if he/she offers a warranty. If your contractor did not offer you a warranty, you may call American Standard @ 1-800-442-1902 mon-fri. from 8 am-6pm EST. If you have to go through them, the part should be under warranty, but you will be on your own for the labor portion. I would still check with my contractor first. I do not know any contractor that does not offer a one year warranty. Unless this was just a handyman and not a professional contractor.