If your shower has no hot water but other fixtures do, the problem is usually the shower mixing valve or anti-scald setting.
Quick Answer
Start Here: Is It Just the Shower?
Shower No Hot Water Diagnostic Table
Common Causes
Mixing Valve Problems
Anti-Scald Settings
How to Fix It
When to Call a Pro
Next Steps & Related Guides
FAQs
If your sink gets hot water but your shower doesn’t, your water heater is working. The issue is almost always inside the shower valve.
Quick Answer
No hot water in a shower is usually caused by a faulty mixing valve, a worn cartridge, or an anti-scald setting that limits temperature.
Start Here: Is It Just the Shower?
- Only the shower is affected: Valve or cartridge issue
- Other fixtures also affected: See No Hot Water
Shower No Hot Water Diagnostic Table
| What you notice | Likely cause | What to check |
|---|---|---|
| No hot water at all | Faulty mixing valve | Replace cartridge |
| Water only lukewarm | Anti-scald setting too low | Adjust limit stop |
| Temperature fluctuates | Worn valve cartridge | Inspect and replace |
Common Causes
Faulty mixing valve
The mixing valve blends hot and cold water. If it fails, hot water may not reach the shower.
Worn cartridge
The cartridge inside the valve can wear out or clog, blocking hot water flow.
Anti-scald setting too low
Most modern showers limit temperature for safety. If set too low, the water won’t get hot enough.
Mixing Valve Problems
The mixing valve is the most common cause of shower temperature problems. Over time, mineral buildup and wear can prevent it from functioning properly.
Anti-Scald Settings
Many shower valves include a temperature limit stop. Adjusting this slightly higher can restore proper hot water.
How to Fix It
- Remove and replace the shower cartridge
- Adjust the anti-scald limit stop
- Clean mineral buildup from valve components
When to Call a Pro
- Valve is difficult to access
- You are unsure of the valve type
- Problem persists after replacing the cartridge
Next Steps & Related Guides
FAQs
Why does my shower have no hot water but the sink does?
This usually means the shower mixing valve or cartridge is faulty.
How do I make my shower hotter?
Adjust the anti-scald limit stop or replace the cartridge.
Can a shower valve block hot water?
Yes. A worn or clogged valve can prevent hot water from flowing.
