If your kitchen sink only has hot water, the first thing you should do is check your water heater. This is the most common cause of the issue and can easily be resolved. Start by checking the temperature setting on your water heater. Make sure it is set high enough to provide hot water to your sink. If the setting is too low, your water may not be heating up enough to reach your kitchen sink. If the temperature setting is not the issue, check the pilot light on your water heater. If it is out, relight it according to the manufacturer's instructions. If it continues to go out, there may be an issue with the thermocouple or gas supply and you should call a professional plumber for assistance.1. Check the water heater
The next step is to check the water supply valve for your kitchen sink. This valve controls the flow of water to your sink and may have accidentally been turned off. Look under your sink for a small lever or knob and make sure it is in the "on" position. If it is off, simply turn it back on and see if your hot water starts working.2. Check the water supply valve
Another possible cause of your kitchen sink only having hot water is a clogged faucet aerator. Over time, mineral deposits and debris can build up in the aerator, restricting the flow of water. To check if this is the issue, unscrew the aerator from the end of your faucet and clean it out. You can use a small brush or toothpick to remove any buildup. Then, screw it back on and test your hot water again.3. Check the faucet aerator
If your kitchen sink has a separate hot water shut-off valve, make sure it is fully open. Sometimes, these valves can become partially closed or stuck in the closed position, blocking the flow of hot water to your sink. If this is the case, simply turn the valve to the open position and your hot water should start working again.4. Check the hot water shut-off valve
Another possible culprit is a blockage in the hot water supply line. This can happen if there is a buildup of sediment or debris in the pipes, causing a restriction in the flow of water. You can try flushing out the supply line by turning off the water heater, attaching a hose to the drain valve, and running cold water through the tank until it runs clear. If this doesn't work, you may need to call a plumber to professionally clean the supply line.5. Check the hot water supply line
If you recently had maintenance or repairs done on your water heater, the temperature setting may have been accidentally adjusted. Check the temperature setting on your water heater and make sure it is set to the desired hot water temperature. If it is set too low, your hot water may not be reaching your kitchen sink.6. Check the hot water temperature setting
In some cases, a clogged pipe may be causing your kitchen sink to only have hot water. This can happen if there is a buildup of debris or a blockage in the pipes leading to your sink. You can try using a plunger or drain snake to clear out the clog. If this does not work, you may need to call a plumber to professionally clean the pipes.7. Check for a clogged pipe
If your kitchen sink has a mixing valve, it may be the cause of your hot water issue. This valve is responsible for mixing hot and cold water to the desired temperature. If it is faulty or worn out, it may not be able to properly mix the water, resulting in only hot water coming out of your sink. In this case, you will need to replace the mixing valve to restore hot and cold water to your sink.8. Check for a faulty mixing valve
The dip tube is a small plastic tube inside your water heater that directs cold water to the bottom of the tank to be heated. If this tube breaks or becomes dislodged, it can result in only hot water coming out of your faucet. If you suspect this is the issue, you will need to call a plumber to replace the dip tube.9. Check for a broken dip tube
If you have tried all of the above solutions and your kitchen sink is still only providing hot water, it is time to call a professional plumber for assistance. They will be able to diagnose the issue and provide a solution to get your hot and cold water working properly again. Don't hesitate to call for help, as leaving the issue unresolved can lead to further damage and costly repairs. In conclusion, there can be several reasons why your kitchen sink only has hot water. By following these tips and troubleshooting steps, you can determine the cause and hopefully resolve the issue on your own. However, if the problem persists, don't hesitate to call a professional for help. With their expertise and knowledge, they can quickly and efficiently fix the issue and get your hot and cold water flowing again.10. Call a plumber for professional assistance