My kitchen sink does not have hot water. It runs cold only. I have hot water everywhere else in the house. What could be wrong?:confused:

Check under the sink. There should be two angle stop cocks that can be closed shutting off water to the faucet. Use a crescent wrench and remove the nut on the exit side of the hot supply cock. Open the cock slightly with a towel or bucket handy. If you have hot water here then I would plan to remove the valve assembly in the faucet. You did not say if you have a single handle which would indicate a mixing valve or double handles which each have their own valve. Remove the valve and inspect it carefully for debris or white crud. Good idea to remove and clean the aerator and clean it at this time. Some junk gets past the valve only to get caught in the aerator.

My kitchen sink does not have hot water. It runs cold only. I have hot water everywhere else in the house. What could be wrong--

Followed the previous answer but my joints are single piece without any connectors.

mrtechlock

Could be one more frozen pipe. I don't understand exactly why, but the hot always freezes first.

Otherwise, before I messed with a compression fitting, I would pull the cartridge on the hot water. Hold a towel over it and crack the valve. Chances are you will get a bunch of crud in the water. Shut the valve, put things back together, and you are done.

Most of the single handle and 2 handle faucets all come apart alike. Shut the water off. Pry the cap off, unscrew the screw, pull off the handle exposing a nut. Unscrew the nut and pull everything out.

"Could be one more frozen pipe. I don't understand exactly why, but the hot always freezes first."

Let me take the mystery out of it Lab. There's a reason that we advise conecting the ice maker to the hot water supply.
When water enters a water heater and sets it deoxidizes itself. This means there are no air bubbles in the water which means a ice cube that's not cloudy but a clear cube. Also since the water sets in the pipe
It's no longer hot but room temperature when the ice maker makes a draw.
The same thing about a hot water pipe that's left in a enclosure that's freezing. Setting there it cools down to freezing temperature and having no air bubbles in it the water's denser and so freezes up faster then cold water.
And now you know the rest of the story. Cheers, Tom

Great answer Speedball. I was just about to give the scientists answer when I read your post. I taught physics for many years and density and lack of air allow water to freeze just a few defreees lower than cold water. If her hot water pipe is really frozen she might chcek before a worse problem happens. When pipes freeze they expand and can crack the pipe or a fitting. You won't know about this new problem until the pipes thaw, then all heck breaks out. I accidentally left my garden hose connected to a frostproof outside sill cock. Temps hit zero and a week later the copper pipe let go. Both of these home owners should consider shuting off their main and applying heat to the pipes under the sink and in the basement/crawl space. Open the main slowly after the pipes are warmed up.