Kitchen faucet pulsing when on hot water

Just started doing it? How old is the water heater? Might need sediment cleaned out of it. Any other faucets doing it or just the kitchen? What type of pipe is the supply line? Old copper can get crusty inside after a while.

I’d change the cartridge, and see what happens. Newer kitchen fixtures usually have a lifetime warranty, so you can probably get a replacement cartridge for free from the manufacturer.

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Started about a month ago. Water heater is about 12 years old. No other faucets affected. Not sure of the suply line since its behind the cabinet wall.

How do I check for sediment? In the cartridge?

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Can you access any of the water lines? Or is it on a slab? Ours are all visible in the basement, and the kitchen is the first faucet on the water lines. Just a shot in the dark, but if you replaced the faucet about a year ago, the water had to have been shut off and drained from the lines. Could be that cutting the water back on stirred up sediment in the 12 year old water heater, and when the lines were filling back up it might have sent some and got there first.

You can check the water heater for sediment by hooking up a hose to the valve near the bottom and turning that handle, or like mine, which has a slotted opening, use a flat headed screwdriver to turn it to open and check what the water looks like coming out of the hose. If you can't easily get a hose run to outside, you can always use a 5 gallon bucket and catch what is coming out. Should know right away if the water is cloudy. Let it run until the water is clear, and then a little more.

Another thought, is there a separate water valve and a small hose running from that to the faucet? You can take that off and see if that little supply hose is clogged up.

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Started about a month ago. Water heater is about 12 years old. No other faucets affected. Not sure of the suply line since its behind the cabinet wall.

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You are on borrowed time with a 12 year old water heater. Likely it has rust in it and sediment. 12 years is pushing it.