If your bathtub faucet won’t turn on the shower, it usually means the diverter valve has failed. The diverter is the small mechanism that redirects water from the tub spout up to the showerhead. When it stops working, you’re left with water only coming out of the tub — no matter how hard you pull the lever. The good news is this problem is common and fixable. Let’s look at the causes, repair steps, and when it’s best to replace the faucet altogether.
Why Your Bathtub Faucet Isn’t Switching to the Shower
The diverter valve sits inside the tub spout or the faucet handle. It’s responsible for sending water to the showerhead when engaged. If it fails, the shower won’t turn on. Common causes include:
- Worn-out diverter valve – Seals wear down over time and can’t block water flow properly.
- Mineral deposits – Hard water buildup prevents the valve from closing fully.
- Broken diverter handle or knob – If the lever feels loose or jammed, the internal parts may have snapped.
- Old or corroded faucet – With age, the faucet body itself can fail, making repair difficult.
How to Fix a Bathtub Faucet Diverter
Here’s how you can troubleshoot and fix the problem before calling a plumber:
- Turn off the water supply. Always shut off your water lines before disassembly.
- Check the diverter lever. If it’s loose or doesn’t pull up, the internal spring or seal may be broken.
- Remove the tub spout. Most spouts unscrew or slide off with a set screw. Inspect the diverter mechanism inside.
- Clean the spout. Soak it in vinegar to dissolve calcium and mineral deposits.
- Replace the spout if damaged. A new diverter tub spout is inexpensive and can be swapped in under 30 minutes.
If you’ve replaced the spout but the shower still won’t activate, the problem is likely in the valve system behind the wall. In that case, replacing the entire faucet setup is the best solution.
When to Replace Instead of Repair
You should consider replacing the faucet system if:
- Your faucet is more than 10–15 years old.
- You see rust, corrosion, or cracks in the spout.
- Replacing the diverter spout didn’t solve the problem.
- You want a style or performance upgrade.
Modern tub and shower faucet systems feature reliable diverters, pressure-balancing valves, and stylish finishes that refresh your entire bathroom.
Best Replacement Bathtub & Shower Faucets
Moen Adler 82604 Tub and Shower Faucet
Best Overall for durability and value.
- Pressure balancing to keep water temperature steady.
- Available in multiple finishes (chrome, brushed nickel, bronze).
- Includes diverter spout and showerhead.
Pros:
- Affordable and reliable
- Good shower pressure
- Simple installation
Cons:
- Basic showerhead (can be upgraded separately)
- Valve installation may require a plumber
Verdict: An excellent all-around option for fixing diverter issues. Check Price on Amazon.
Delta Faucet Windemere Tub and Shower Trim Kit
Best for classic and traditional bathrooms.
- Includes matching showerhead and diverter spout.
- WaterSense certified for water efficiency.
- Oil-rubbed bronze option for a rustic look.
Pros:
- Elegant design
- Water-saving features
- Durable construction
Cons:
- Valve sold separately
- Installation may need a professional
Verdict: Perfect if you want charm and reliability. Check Price on Amazon.
Grohe Concetto Pressure Balance Tub & Shower Faucet
Best Luxury Choice for high-end remodels.
- German engineering with precise water control.
- Pressure balancing valve prevents temperature shocks.
- StarLight chrome finish resists tarnishing.
Pros:
- Premium quality
- Modern, sleek design
- Excellent leak resistance
Cons:
- Higher cost
- Installation usually requires a plumber
Verdict: A luxury option for homeowners who want lasting quality. Check Price on Amazon.
Comparison Table
| Faucet | Key Features | Style | Price |
|---|---|---|---|
| Moen Adler | Pressure balancing, diverter spout | Modern | $$ |
| Delta Windemere | WaterSense, classic trim kit | Traditional | $$$ |
| Grohe Concetto | Pressure balance, luxury design | Luxury | $$$$ |
FAQ
1. Why won’t my bathtub faucet switch to the shower?
Most often, the diverter valve inside the tub spout is broken or clogged with mineral buildup.
2. Can I just replace the tub spout?
Yes — if the diverter inside the spout is the issue, replacing the spout will usually restore your shower.
3. Do I need a plumber to replace a spout?
Not always. Many spouts are screw-on or slip-on and can be replaced with basic tools. For full faucet systems, a plumber may be needed.
4. How long do diverter spouts last?
On average, 7–10 years, depending on water quality and usage.
Conclusion
A bathtub faucet that won’t turn on the shower is almost always caused by a faulty diverter. Replacing the tub spout is usually a quick DIY fix. But if your faucet system is old or corroded, a full replacement will give you better performance, water savings, and a stylish bathroom upgrade.
Don’t put up with a broken shower — explore the best bathtub and shower faucets on Amazon today and enjoy a reliable, leak-free shower experience.