Shower Won't Turn Off? Diagnose the Issue in 3 Steps

Is your shower refusing to turn off completely no matter how hard you crank the faucet handle? This irritating plumbing problem can quickly lead to wasted water and potential flooding if not addressed. Don't panic - with some targeted troubleshooting, you can get to the bottom of what's causing your uncooperative shower and fix the issue yourself.

Read on to learn how to inspect your shower valve, check for leaks and sediment buildup, and determine if professional help is needed. With the right information, you can take control and show that malfunctioning shower who's boss!

Step 1: Locate the Shut-Off Valve

Before doing any troubleshooting, it's crucial to stop the flow of water to your leaky shower. This prevents wasting more water while you diagnose the problem. The best way to do this is by shutting off the main water shut-off valve for your home.

This valve is usually located where the main water line enters your home, often in the basement, crawlspace, garage, or a closet. It may take some hunting, but finding this valve gives you control over your water supply.

Once located, turn the water shut-off valve clockwise until it's fully closed. This stops all water from entering your home. If you're unsure about touching the valve, contact your landlord or plumber.

Tips for Finding Your Shut-Off Valve

• Check areas listed above where main water line enters
• Look for a large valve with a hand-wheel or level
• May be rusted; spray with WD-40 if valve is stuck
• Some shut-off valves are located under sinks - turn them all off

Step 2: Inspect the Shower Valve and Cartridge

With your water turned off, you can now safely inspect the shower valve and cartridge for issues. Start by removing the shower handle and any decorative trim or cover surrounding the valve so you can examine it closely.

Check for cracks, corrosion, leaking, or damage. Give the valve a few turns back and forth to feel for sticking or obstruction. It should rotate smoothly.

Next, remove the valve cartridge. Look for worn out rubber washers, mineral buildup, or other debris interfering with proper operation. Rinse the cartridge with water to clear any particles.

If the cartridge is excessively worn or defective, simply replacing it with a matching new one can fix your drip. Make sure to lubricate rubber washers and o-rings with non-petroleum grease during reassembly.

Signs Your Shower Cartridge Needs Replacement:

• Hard water deposits or corrosion
• Bent, damaged, or worn parts
• Leaking from base of valve
• Dripping even when "off"
• Difficulty shutting water off completely

Step 3: Check for Leaks and Sediment Buildup

If replacing the cartridge doesn't resolve a shower that won't turn off, inspect the rest of the shower components for issues. Check around the shower valve, flexible supply tubes, shower arm, and showerhead for any drips or leaks.

Also examine the pipes for heavy sediment deposits. Hard water can leave mineral buildup that restricts water flow and interferes with the shower valve mechanism. Remove and clean shower parts if you find accumulated sediments.

Use a solution of half vinegar, half warm water to dissolve and flush away scale deposits from all shower components. Replace old pipes or any rubber washers that have become cracked or worn out.

Preventing Sediment Buildup

• Install shower head water filter
• Frequently clean mineral deposits from showerhead
• Consider installing a whole house water softener
• Replace washers and o-rings regularly

When to Call a Professional Plumber

If you've gone through these troubleshooting steps and your shower continues to run nonstop, it may require professional service. A licensed plumber has the expertise to accurately diagnose issues like pressure balance valve failure, problems with the tub spout diverter, or leaks in the pipes in your wall.

While a running shower can often be a quick DIY fix, there are times when calling a pro is the best solution. It will save you time, money, and frustration in the long run. And you'll have peace of mind knowing any underlying problems have been properly repaired.

Preventing Future Shower Shut-Off Issues

With some periodic maintenance and parts replacement, you can avoid most shower problems in the future:

• Clean showerhead and check valves for sediment every 6 months
• Replace worn out rubber seals and washers
• Upgrade to a newer pressure balance valve for maximum protection
• Use water softening to reduce mineral deposits

Investing in a higher quality shower cartridge and fixtures can also boost longevity and function. Over time, an outdated shower valve may need to be fully replaced. A professional plumber can ensure this is done properly.

Dealing with a shower that won't shut off can try your patience, but is usually repairable with some easy troubleshooting. First, stop the water flow at the main shut-off valve. Then inspect the shower valve and cartridge closely, test components, and replace any worn parts. Finally, check for leaks and clear any clogged sediment or mineral deposits.

You can diagnose shower problems with this helpful 3-step process. But if issues persist, don't hesitate to call a professional plumber to correctly identify and fix any underlying defects.