If a faucet has no hot water while other fixtures do, the problem is usually a worn cartridge, clogged aerator, or a partially closed shutoff valve.
Quick Answer
Start Here: Is It Just One Faucet?
Faucet No Hot Water Diagnostic Table
Common Causes
Single vs. Double-Handle Faucets
How to Fix It
When to Call a Pro
FAQs
Next See
If your faucet isn’t producing hot water but other fixtures in your home are working normally, your water heater is not the issue. The problem is almost always inside the faucet or its immediate plumbing connections.
Important: If multiple fixtures have no hot water, the issue is likely your water heater. See No Hot Water for full troubleshooting. For broader fixture issues, see No Hot Water at One Fixture.
Quick Answer
No hot water in a faucet is usually caused by a worn cartridge, clogged aerator, debris in the line, or a shutoff valve that isn’t fully open.
Start Here: Is It Just One Faucet?
Confirm whether the issue is limited to one faucet.
- Only one faucet affected: Internal faucet or local plumbing issue
- Multiple fixtures affected: See No Hot Water
Faucet No Hot Water Diagnostic Table
Use this table to quickly identify the most likely cause.
| What You Notice | Likely Cause | What to Check |
|---|---|---|
| No hot water at faucet | Faulty cartridge | Replace cartridge |
| Low hot water flow | Clogged aerator | Clean aerator |
| Hot water suddenly stopped | Debris blockage | Flush lines |
| Weak or uneven flow | Partially closed shutoff valve | Check valves under sink |
Common Causes
Most faucet problems are caused by wear, buildup, or minor plumbing issues.
Worn or failed cartridge
The cartridge controls water flow and temperature. When it fails, it can block hot water completely or reduce flow.
Clogged aerator
The aerator at the tip of the faucet can collect mineral deposits and debris, restricting hot water flow.
Debris in plumbing lines
After plumbing work or sediment movement, particles can clog the faucet or cartridge.
Shutoff valve not fully open
The hot water valve under the sink may be partially closed, limiting flow to the faucet.
Single vs. Double-Handle Faucets
The type of faucet affects how hot water problems appear and how they are fixed.
- Single-handle faucets: Use a cartridge that controls both hot and cold water. Failure often blocks hot water entirely.
- Double-handle faucets: Have separate hot and cold valves. The hot side may fail independently.
Identifying your faucet type helps determine the correct repair approach.
How to Fix It
Most faucet issues can be resolved with simple repairs.
- Replace the faucet cartridge
- Remove and clean the aerator
- Open shutoff valves fully
- Flush debris from the lines
If the issue is not limited to the faucet, see No Hot Water at One Fixture or No Hot Water.
When to Call a Pro
Call a professional if the problem cannot be resolved with basic repairs.
- Faucet components are stuck or difficult to remove
- Problem persists after replacing the cartridge
- There are signs of hidden plumbing issues
- Multiple fixtures begin losing hot water
FAQs
Why does my faucet have no hot water?
This is usually caused by a faulty cartridge, clogged aerator, or a partially closed shutoff valve.
Can a faucet block hot water?
Yes. Internal components can fail or become clogged, restricting hot water flow.
How do I fix a faucet with no hot water?
Start by cleaning the aerator and replacing the cartridge if needed.
Why does only one faucet have this problem?
Because the issue is localized to that fixture—not the water heater.
