I ended up here, because I'm redoing my kitchen and trying to make a decision about the faucet. I have various faucets throughout my house from Kohler, Moen, Restoration Hardware, and Newport Brass. I think the Restoration Hardware fixtures are made by Newport Brass, because we had to call them when we needed to replace. We've had them from 10-12 years, so I don't know the styles or even if they are made. Almost all are polished nickel, and the Kohler and Moen are always spotless, laundry room and bathroom, respectively. I'm not crazy about the pull down sprayer on the Kohler. The Moen Showcase (do they still make this line?) is in the bathroom, and I love it so much, because I can just pour water over it and it will dry spotless. It's amazing. It is wall mount, and I wish I had it in every bathroom. Because of my success with Moen, when I needed a faucet for my kitchen, I bought an inexpensive (relative to all the other faucets I have) Moen at Home Depot. It is the only non polished nickel faucet I have. It is stainless steel, still looks brand new (10 years+), and the pull down sprayer works wonderfully. Unfortunately, I'd never buy fixtures from Restoration Hardware again. They spot like crazy. The Newport Brass are slightly better, but they also spot. I'm looking at Kohler and Moen for my new kitchen, but the choices are limited in polished nickel. Now I'll look at California Faucets, too, but I'll skip Rohl, since someone mentioned the polished nickel spots so much.

Gilld33 we did get the Kohler Graze in stainless steel, purchased directly from Kohler. By the way, they often have holiday sales, so you might get a good deal on a July 4th sale. It’s a big, beautiful substantial faucet, very easy to use touchless features, Specialty spray functions, and has performed flawlessly so far. We’ve purchased other Kohler faucets (one lasted close to 20 years- when we had a few minor issues, Kohler always stood behind their product regardless of age). We’re very satisfied with our purchase.

Call Kohler - they're pretty helpful. I have the same faucet. I'd also leave that screen in place to protect particles from further obstructing the works. You could also try hooking up the cold water to the hot line to verify it's the faucet at fault.

I have this model from Koehler. It works perfectly. Note you need an electrical connection under the sink. When I leave town I just turn it off by pushing in the handle. To operate you just wave your hand or move a pot or bowl under the sensor. Go to the Koehler site to watch video. I’ve had it about 2 1/2 years with no issues. Note it is expensive but the quality is excellent. No something you will find at local box store. It is also heavy. My plumber said it was good quality https://www.build.com/product/summary/1632478?uid=3873519&jmtest=gg-gbav2_3873519&inv2=1&&source=gg-gba-pla_3873519!c9985097409!a106468653491!dc!ng&gclid=EAIaIQobChMI0c6N3a6Q7wIVC8zICh3REQNKEAQYBSABEgJEDPD_BwE&gclsrc=aw.ds