KWC Domo single handle faucet is sticky...how do I fix that? Do I have to replace a cartridge?

Take handle off (either set-screw from side or bottom of handle, or phillips screw under cap on end of handle), pull off sleeve that's behind handle, unscrew nut that holds cartridge (strap wrench works great) and pull cartridge out.

Does if have a sprayer and is it still hooked up?

mixing chamber of the faucet may be cracked

My bathroom faucet handle (not same brand as yours) was so hard to turn that it pulled the base around with it on the vanity when I jerked it. I used an Allen wrench to take out one of the set screws holding the handle on, put the tiny straw of a WD40 can in the set screw hole, squirted WD40 inside the handle, replaced the setscrew, and worked the handle to and fro a few times to lubricate the inside. No more sticking!

lowes home improvment

It is possible that you installed a bad valve cartridge, it would not be the first one. It is also possible to over tighten the cartridge retaining nut, rare, but it can happen. In either situation you need to call KWC and ask them to send you a new cartridge asap. They are usually very easy to work with. If you need further assistance please let us know.

Just received the new part for the domo. My model is older and is chrome with black. I have removed the top screw and need to know what is the next step in taking apart the rest of the faucet so I can replace the new part # k.32.60.00

Thank you, Stuart

I would definitely take it apart to find out what is causing it to bind, that is not normal. Make sure that you turn your water supply lines off under the sink, via angle/strait stops. From under the faucet there is one or two nuts fastening the faucet to the counter, they are usually screwed on just a little more than hand tight. The problem may not be fixable, so be prepared to replace the faucet.

Having installed and fixed kwc domo faucets for years I'd probably take the spray head off of the hose, then look into the bottom of the spray head and see if the check valve is still there. It probably is. I used to use a thin screwdriver to pry the check valve out out.It will come out. You need to work at it a bit but these hold back a lot of water pressure and catch any crud coming down the water lines.
TL

firs you have to remove the handle

remove lastic cap on top or no cap look for a erasure size cap or ruber tab on the side

take a flashlight and determine if you need an allen head screw or phillps

remove the screw( be sure to cover your drains so nos small parts get in bottom

remove the handle

depending on the type of faucet you may have to unscrew a large nut holding the cartridge in place

whatever remove anything holding the cartridge down (some require a cartridege remover)

remove, take to store match up new and replace

by all means turn water of under sinnk good luck

TIP anytime you have to put a wrench on chrome protect chrome with a wash cloth