How to Fix a Kitchen Sink Faucet with No Hot Water: Causes & Easy Solutions
You turn on the hot water to wash a greasy pan or soak some dishes, and nothing comes out. Cold water flows fine, but the hot side is completely dead. This frustrating situation can make kitchen tasks feel impossible—but it’s usually fixable.
TL;DR
A kitchen sink faucet that won’t dispense hot water usually has a localized blockage in the hot water line, a clogged cartridge, debris in the aerator, or a problem with the shut-off valve under the sink. The key is to work backward from the faucet—starting with the aerator and cartridge, then checking the supply lines and shut-off valve. In most cases, the problem is a simple debris clog that can be fixed without calling a plumber.
Key Takeaways
- A blocked aerator or cartridge is the most common cause of no hot water when cold water works fine .
- The hot water shut-off valve under the sink might be partially or fully closed—this is the easiest thing to check first .
- Debris from plumbing work can get lodged in the hot water line, cartridge, or aerator, blocking flow entirely .
- A single-handle faucet’s cartridge controls both hot and cold water—if cold works but hot doesn’t, the hot side of the cartridge is likely clogged .
- For pull-down faucets, the spray head screen or connection point can trap debris and block flow .
Why Your Kitchen Faucet Has No Hot Water—But Cold Works Fine
When cold water comes out normally but hot water doesn’t flow at all, the problem is isolated to the hot water path. This is a localized issue between your main hot water supply and the faucet spout . Unlike low pressure, which is a trickle, no water usually means a complete blockage somewhere.
The Most Common Culprits
1. A Clogged Aerator
The aerator is the small mesh screen at the tip of your faucet. It catches debris—rust particles, mineral scale, or sediment—and can become completely blocked . While this usually affects both hot and cold, debris from the hot water line can get stuck there and block hot flow specifically. This is the easiest thing to check and fix .
2. A Clogged Faucet Cartridge
The cartridge is the internal valve in your faucet handle that mixes hot and cold water. If you have a single-handle faucet, the cartridge has separate ports for hot and cold water. Dirt or mineral deposits can clog the hot water port, stopping flow entirely .
If a cartridge is heavily scaled or damaged, cleaning may not be enough, and replacing it is the more reliable solution . This is one of the most common causes when cold water works but hot water doesn’t .
3. Debris After Plumbing Work
If you’ve had recent plumbing work, water line repairs, or the city shut off your water, debris can get kicked loose and travel through the pipes . Hot water lines are especially prone to this because sediment tends to settle there. One homeowner found that after the city worked on water lines, their kitchen hot water stopped working while every other faucet in the house worked fine .
4. A Kinked or Blocked Hot Water Supply Line
The flexible supply line connecting your faucet to the shut-off valve can become kinked, cutting off water flow . A kink in the hose restricts or stops the amount of water being supplied to the faucet . Also, the inner lining of braided steel supply lines can degrade over time, and fragments can accumulate and completely block water movement .
5. A Faulty or Closed Hot Water Shut-Off Valve
The valve under your sink controls the flow of hot water to the faucet. It might be partially or fully closed—sometimes accidentally bumped while cleaning under the sink. Older multi-turn valves are also prone to internal blockage from sediment buildup . In some cases, a valve can fail internally and stop water flow even when fully open .
6. A Blocked Spray Head Screen (Pull-Down Faucets)
For pull-down or pull-out kitchen faucets, there’s a small screen at the connection point between the hose and the spray head. This screen can trap debris and block flow completely .
Step-by-Step Diagnostic Guide
Follow these steps in order. This is the same approach manufacturers recommend for troubleshooting no-flow issues .
Step 1: Check the Hot Water Shut-Off Valve
This is the simplest fix.
- Look under the sink and locate the valve on the hot water supply line (usually on the left) .
- Make sure it’s fully open by turning it counterclockwise until it stops .
- If the valve is broken or spins endlessly, you may need to turn off the main water supply and replace it .
Step 2: Check the Aerator
- Unscrew the aerator from the tip of the faucet. Use pliers wrapped in tape to avoid scratching the finish .
- Inspect it for debris. If it’s clogged with sediment or rust, clean it thoroughly.
- Soak it in white vinegar for at least 30 minutes, or overnight, to dissolve mineral deposits .
- After cleaning, run the hot water without the aerator installed. If hot water flows strongly, the aerator was the problem .
Step 3: For Pull-Down Faucets—Check the Spray Head Screen
If your faucet has a pull-down or pull-out spray head, this is a common cause of blockages .
- Remove the spray head from the hose (unscrew it by hand) .
- Inspect the small screen at the connection point. If there’s debris, rinse it off with water .
- Hold the end of the hose in the sink and turn on the hot water .
- If hot water flows strongly from the hose, the spray head screen was the problem—clean and reinstall it.
- If there’s still no flow from the hose, the problem is deeper in the faucet or supply line.
Step 4: Check the Supply Line
- Under the sink, close the hot water shut-off valve.
- Disconnect the hot water supply line from the faucet .
- Place the end of the line into a bucket and open the shut-off valve .
- If hot water flows strongly into the bucket, the problem is in the faucet itself (likely the cartridge).
- If there’s no flow from the supply line, the problem is the shut-off valve itself or a blockage in the line .
Step 5: Clean or Replace the Cartridge
If the supply line has flow but the faucet doesn’t, the cartridge is clogged.
Safety reminder: Turn off both hot and cold water supply valves before doing this.
- Remove the faucet handle. Look for a decorative cap or plug that covers a set screw—pry it off gently .
- Use the appropriate tool (often an Allen wrench) to loosen the set screw and remove the handle .
- Unscrew the bonnet nut or retainer ring holding the cartridge in place .
- Carefully pull the cartridge straight out. If it’s stuck, a cartridge puller tool may be needed .
- Inspect the cartridge for mineral scale, grit, or debris. Check the hot water inlet ports specifically .
- Soak the cartridge in white vinegar for several hours or overnight to dissolve mineral buildup .
- With the cartridge removed, briefly turn on the hot water supply to flush any debris from the valve body (hold a bucket or towel over the opening) .
- If cleaning doesn’t restore flow, or if the cartridge is damaged, replace it with an exact match for your faucet model .
- Reinstall the cartridge, reassemble the faucet, and test the hot water.
No Hot Water Causes Comparison
| Cause | Diagnostic Sign | DIY Fix | When to Call Pro |
|---|---|---|---|
| Closed or faulty shut-off valve | No flow; valve isn’t fully open or won’t turn | Turn valve fully counterclockwise | If valve is broken or won’t close—needs replacement |
| Clogged aerator | No flow from spout; cleaning aerator restores hot water | Remove, clean, and reinstall aerator | If aerator is damaged or corroded |
| Clogged spray head screen | Pull-down faucet; hot water flows from hose but not spray head | Clean or remove the screen at the connection | If screen is damaged or cleaning doesn’t help |
| Clogged hot water cartridge | Supply line has flow but faucet doesn’t; cold works fine | Remove, clean, and reinstall cartridge; flush valve body | If cartridge is damaged or heavily scaled—replace it |
| Blocked or kinked supply line | No flow from supply line when tested separately | Straighten kink; backflush the line | If line is damaged or corroded—replace it |
| Debris from plumbing work | Problem started after recent repairs or water shutoff | Flush supply line and clean cartridge | If debris is in the main line—plumber needed |
Frequently Asked Questions (FAQ)
Why does my kitchen sink have cold water but no hot water?
This usually means there’s a localized blockage in the hot water path—often a clogged aerator, cartridge, or shut-off valve .
How do I know if my faucet cartridge is clogged?
If hot water flows from the supply line under the sink but not from the faucet, the cartridge is likely clogged .
Can a clogged aerator stop hot water completely?
Yes. The aerator’s fine mesh can trap debris and become completely blocked, stopping flow entirely .
Do I need to turn off the water to clean the cartridge?
Yes. Always turn off both hot and cold water supply valves before removing the cartridge .
Why would the hot water stop only in my kitchen but everywhere else works?
This is a localized issue in the kitchen’s hot water line, faucet, or shut-off valve. If other fixtures have hot water, the problem isn’t your water heater .
When should I call a plumber instead of DIY?
If you’ve checked the valve, aerator, and cartridge and still have no flow, or if you’re uncomfortable working with plumbing connections, call a professional .
References
Trusted Plumbing & Home Maintenance Resources for No Hot Water Issues:
- Moen – Low Water Flow Troubleshooting
- Kohler Assist – Low Flow from Hot and Cold Water
- Engineer Fix – No Hot Water Pressure Guide
- Engineer Fix – How to Fix a Clogged Cartridge
Which kitchen problem do you want solved next? Share your thoughts in the comments.
