If a faucet has no hot water, the problem is usually a faulty cartridge, clogged aerator, or a partially closed shutoff valve.
Quick Answer
Start Here: One Faucet or More?
Faucet No Hot Water Diagnostic Table
Common Causes
Cartridge Problems
Aerator Blockage
How to Fix It
When to Call a Pro
Next Steps & Related Guides
FAQs
If only one sink has no hot water, the issue is almost always inside the faucet or its immediate plumbing connections—not the water heater.
Quick Answer
No hot water in a faucet is usually caused by a worn cartridge, clogged aerator, or a shutoff valve that isn’t fully open.
Start Here: One Faucet or More?
- Only one faucet affected: Local issue
- Multiple fixtures affected: See No Hot Water
Faucet No Hot Water Diagnostic Table
| 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 |
| Problem started recently | Debris blockage | Flush lines |
Common Causes
Worn faucet cartridge
The cartridge controls water flow and temperature. When it fails, hot water may be blocked.
Clogged aerator
Mineral buildup can block the small screen at the end of the faucet.
Shutoff valve not fully open
The hot water valve under the sink may be partially closed.
Debris in plumbing lines
Particles can clog the faucet after plumbing work or sediment movement.
Cartridge Problems
Replacing the cartridge is often the most effective fix for a faucet with no hot water.
Aerator Blockage
Remove the aerator and rinse it clean to restore flow.
How to Fix It
- Replace the faucet cartridge
- Clean or replace the aerator
- Open shutoff valves fully
- Flush debris from lines
When to Call a Pro
- Problem persists after basic fixes
- Valve or plumbing access is limited
Next Steps & Related Guides
FAQs
Why does my faucet have no hot water?
This is usually caused by a faulty cartridge or clogged aerator.
Can a faucet block hot water?
Yes. Internal components can fail or become clogged.
How do I fix a faucet with no hot water?
Start by cleaning the aerator and replacing the cartridge if needed.
