Why Does Water Come Out of the Shower Head but Not the Tub Faucet?

Experiencing water coming out of your shower head but not your tub faucet can be confusing and frustrating. This issue often leaves homeowners scratching their heads, wondering what went wrong. Fortunately, this problem is usually fixable with some basic troubleshooting. Why does water come out of the shower head but not the tub faucet? In this post, we’ll dive into the possible reasons behind this plumbing issue and provide detailed guidance on how to address each one.

Understanding the Basics: How Does the Diverter Valve Work?

Before diving into potential problems, it’s helpful to understand how your bathtub and shower plumbing system works. Most bathtubs with a shower have a diverter valve, which directs water either to the tub spout or the shower head. The diverter is typically controlled by a lever, knob, or switch on the tub faucet. When you want water to flow from the shower head, you activate the diverter, redirecting the water flow. If the diverter valve is malfunctioning, it could be one of the primary reasons why water is coming out of the shower head but not the tub faucet.

Why does water come out of the shower head but not the tub faucet

Faulty Diverter Valve

The diverter valve is the most likely culprit if you’re experiencing issues with water flow between your tub faucet and shower head. Over time, this valve can become stuck, clogged, or simply wear out due to constant use and exposure to water.

Signs of a Faulty Diverter Valve:

• Water continuously drips from the shower head when the tub faucet is on.
• The diverter handle feels loose or does not fully engage.
• No water comes out of the tub faucet when the diverter is not engaged.

How to Fix a Faulty Diverter Valve:

Cleaning the Diverter Valve: Mineral buildup and debris can clog the diverter valve, hindering its function. To clean it, you’ll need to remove the valve, which may involve unscrewing the tub faucet. Once removed, soak the valve in vinegar or a lime-dissolving solution to break down mineral deposits. Scrub it gently with a brush to remove any remaining debris.

Replacing the Diverter Valve: If cleaning doesn’t work or the valve appears damaged, it’s time to replace it. You can purchase a new diverter valve from a hardware store. Make sure to turn off the water supply before starting any repairs. If you’re not comfortable doing this yourself, hiring a plumber might be the best option.

Low Water PressureLow water pressure can affect the water flow to your tub faucet and shower head. When the pressure is insufficient, water may only trickle or not flow correctly when you switch from one outlet to the other.Causes of Low Water Pressure:

• Water Supply Issues: A problem with your home’s water supply line can cause low pressure. This could be due to a municipal water supply issue or a leak in your home’s plumbing.
• Clogged Pipes: Over time, pipes can become clogged with mineral deposits, rust, or debris, reducing water flow.

How to Fix Low Water Pressure:

Check Other Fixtures: Determine if the low water pressure is isolated to your shower and tub or affects the entire house. If all fixtures are experiencing low pressure, the issue might be with the main water line.

Inspect Pipes for Clogs: If low water pressure is only affecting your shower and tub, there may be a clog in the pipes leading to your bathroom. In this case, you might need to flush the pipes or use a plumbing snake to clear the obstruction.

Contact Your Water Supplier: If you suspect the issue is with your municipal water supply, contact your local water supplier for more information.

Clogged Tub Spout or Shower HeadAnother common reason for water coming out of the shower head but not the tub faucet is a clog. Over time, mineral deposits, soap scum, and other debris can build up inside the tub spout or shower head, blocking water flow.How to Identify a Clog:

• Inconsistent Water Flow: If water spurts out unevenly or only trickles, there could be a blockage.
• Visual Inspection: Look inside the tub spout and shower head. If you see any visible buildup, this could be the source of the problem.

How to Fix a Clogged Tub Spout or Shower Head:

Remove and Clean: Remove the tub spout and shower head from their respective fittings. Soak them in a vinegar solution for a few hours to dissolve any mineral deposits. Use a small brush to scrub away any remaining debris.

Replace If Necessary: If the clog is severe or the components are damaged, consider replacing the tub spout or shower head with new ones.

Plumbing IssuesSometimes, the problem may not be with the diverter valve or water pressure but with the plumbing itself. Corroded pipes, leaks, or improper installations can disrupt water flow and cause water to come out of the shower head instead of the tub faucet.How to Identify Plumbing Issues:

• Check for Leaks: Look for signs of water damage around your bathroom, such as damp walls, water stains, or mold growth. These could indicate a leak in your plumbing system.
• Listen for Unusual Sounds: If you hear strange noises, such as banging or gurgling when you turn on the water, this could indicate a problem with your pipes.

How to Fix Plumbing Issues:

Repair Leaks: If you find a leak, you may need to patch it or replace the damaged section of pipe. Depending on the location and severity of the leak, you might be able to fix it yourself or need to call a plumber.

Inspect Pipe Installation: Incorrect plumbing installations can cause water flow issues. If your pipes were installed incorrectly, they might need to be reinstalled by a professional plumber to ensure proper water flow.

Diverter Gate Stuck or MisalignedThe diverter gate, a component inside the valve that redirects water flow, can become stuck or misaligned. When this happens, water may not flow properly between the tub faucet and shower head.How to Identify a Stuck or Misaligned Diverter Gate:

• Difficulty in Switching Water Flow: If it’s hard to switch water from the tub faucet to the shower head or vice versa, the diverter gate may be stuck.
• Inconsistent Water Flow: Water may come out of both the tub faucet and shower head simultaneously, or there may be no flow at all.

How to Fix a Stuck or Misaligned Diverter Gate:

Reposition the Diverter Gate: If you’re comfortable with basic plumbing tasks, you can try to reposition the diverter gate yourself. This typically involves removing the valve cover and adjusting the gate’s position.

Replace the Diverter Assembly: If the gate is damaged or severely misaligned, it may be best to replace the entire diverter assembly. This is a more complex task and may require a plumber’s expertise.

Preventative Measures to Avoid Future Problems

To prevent future issues with your tub faucet and shower head, consider these preventative measures:

Regular Maintenance:

Clean your tub spout, shower head, and diverter valve regularly to prevent mineral buildup and clogs. Soaking these components in vinegar every few months can help dissolve any deposits and keep them functioning properly.

Check Water Pressure:

Monitor your home’s water pressure to ensure it stays within a healthy range. If you notice a sudden drop in pressure, investigate the cause promptly to prevent potential plumbing issues.

Inspect for Leaks:

Regularly inspect your bathroom and plumbing for signs of leaks. Catching a leak early can prevent more extensive damage and costly repairs.

Use Water Softeners:

If you live in an area with hard water, consider installing a water softener to reduce mineral deposits that can clog your plumbing fixtures and valves.

When to Call a Professional

While many of the issues discussed can be fixed with some DIY effort, there are times when calling a professional plumber is the best course of action. If you’re unsure about the cause of the problem, don’t have the necessary tools, or are uncomfortable performing the repairs yourself, a licensed plumber can quickly diagnose and fix the issue, saving you time and stress.

Conclusion

Having water come out of the shower head but not the tub faucet is a common issue that can be caused by various factors, from a faulty diverter valve to low water pressure or clogged fixtures. By understanding the potential causes and taking the appropriate steps to fix them, you can restore your bathroom’s functionality and avoid future headaches. Remember, when in doubt, it’s always a good idea to seek professional help to ensure your plumbing is in top shape.