how to fix a shower knob that keeps turning

Daniel Parker

3 min read

·

18-01-2025

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A shower knob that spins endlessly is frustrating. This comprehensive guide shows you how to troubleshoot and fix this common problem, saving you money and a potential flood. Whether it's a leaky faucet or a completely unresponsive knob, we'll cover the most likely causes and solutions. Understanding your shower's mechanism is key to a successful repair.

Understanding Your Shower Valve

Before diving in, identify your shower valve type. There are two main types:

• Compression Valves: These older valves use rubber washers to control water flow. They're usually identified by separate hot and cold knobs. A worn-out washer is the most frequent culprit in this type of shower valve.

• Cartridge Valves: More modern showers use a single cartridge controlling both hot and cold water. These are often more complex to repair but offer more consistent water temperature control. A worn cartridge or internal damage is the most common issue.

Knowing your valve type will direct you to the appropriate repair method. Let's explore the solutions for each type.

Fixing a Compression Shower Valve

Problem: The knob keeps turning, and water either doesn't come out or leaks uncontrollably.

Cause: Worn-out washer(s) are the most probable cause. Sediment buildup within the valve body can also contribute to the problem.

Solution:

1. Turn off the water: Shut off the water supply to the shower. This is typically done with valves located beneath the sink or behind the shower wall.

2. Remove the knob: Carefully unscrew the knob. This may require a flat-head screwdriver if there's a small screw underneath the knob. Some knobs simply unscrew by hand.

3. Remove the handle: Once the knob is off, you'll see a packing nut and potentially a decorative escutcheon (a plate covering the valve stem). Remove both carefully.

4. Access the washer: The stem should now be accessible. You'll see a washer or possibly multiple washers. These are usually rubber.

5. Replace the washer(s): Remove the old washers and replace them with new ones. Be sure to get the right size and type of washer. Your local hardware store can help.

6. Reassemble: Put everything back together, ensuring everything is tightly sealed but not over-tightened.

7. Turn on the water: Check for leaks and proper operation.

If the problem persists: Sediment buildup could be the issue. You may need to carefully clean the valve body. In some cases, the entire valve assembly might need replacement.

Fixing a Cartridge Shower Valve

Problem: The knob spins without controlling the water flow.

Cause: The most common cause is a worn-out or damaged cartridge.

Solution:

1. Turn off the water: Shut off the water supply to the shower as described above.

2. Remove the handle: Carefully remove the handle, often requiring a flat-head screwdriver to access and remove a retaining screw.

3. Remove the cartridge: The cartridge is usually located beneath the handle. It may be held in place by a retaining clip or nut. Consult your shower valve's instruction manual for specific instructions. Often, a specialized tool might be needed.

4. Replace the cartridge: Install a new cartridge, ensuring it is properly seated. You'll need to find the correct replacement cartridge that matches your shower valve model. The model number is usually printed on the valve body.

5. Reassemble: Put everything back together.

6. Turn on the water: Check for leaks and proper function.

If the problem persists: The valve body itself might be damaged and require replacement.

Preventative Maintenance

Regular maintenance can help prevent this issue. Clean the shower head regularly to remove mineral buildup. Consider using a shower filter to reduce sediment accumulation in the valve.

When to Call a Plumber

If you're uncomfortable working with plumbing, or if you've tried these steps and the problem continues, it's best to call a qualified plumber. Attempting complex repairs without proper knowledge could worsen the situation and potentially cause water damage. A leaky shower can lead to significant water waste and costly repairs if left unattended. Preventing major issues should always be the priority.