Slow and nonexistent water flow.

You have a water valve or back-flow preventer slamming closed, somewhere...

I had the same issue with an American Standard faucet that I installed new 6 months ago. The diverter can be the issue if you have a sprayer attachment. Try unscrewing the sprayer head from the hose it's attached to. Now run the water full pressure with the hose pointed into the sink, obviously :~). After running the water for about 1 minute, connect the sprayer head back onto the hose, make certain the flat rubber washer and ring gaskets are seated in their grooves properly, and tighten until you have no water leaking from the sprayer head/hose connection. Now try the water through the faucet. If the problem was a temporary diverter issue, your pressure should be fine now. Good luck

if you are having trouble removing the set screw make sure you are using the correct size allen wrench and confirm that it is a allen screw and not a trox screw. After doing this try tighten the screw slightly before loosening it. This should break it loose.

It says you have a problem with the hot water. First thing to do is to turn the hot water supply valve under the sink off, and then remove the line from the valve to the faucet at the valve. Then put a bucket underneath the valve and turn it on (carefully). If you don't get any flow, then the problem is in the valve or the pipes supplying the faucet. If you get flow there, then the problem is in the supply line or possibly at the faucet.

I would check take apart the cold flex connector and check the flow when running water into a bucket, if it is wimpy then there is a blockage in the angle stop or the flex connector. If it is good you will need to take the cartridge out, check for signs of debris and possibly replace it

I have the same problem with an American Standard Reliant Kitchen Faucet that wont swivel anymore. I called American Standard and they are sending me the replacement parts to fix it free of charge, I have had mine 6-7 years and they said it was under warranty. Call 800-442-1902. Good Luck

you have air in your water lines

you need pressure to make the spray stay on so maybe check the valve under the sink to see if it has turn almost off, that happen when the pull out nozzle gets returned and the heavy weight on the hose hits the hose

you must remove the faucet form the sink. under the plate in the middle is 2 screws. remove the screws to remove the body.

I would turn off the water then check to make sure you have good flow up to the faucet itself. If you do then there might be a proplem with the cartridge or diverter. does it have a sprayer? If it has a sprayer head for the spout of the faucet then there will be what the call a check valve inside the spray head itself that canbe removed with a skinny screwdriver or something thin and long