Fix a Bathtub Faucet That Keeps Running After Turned Off

It can be incredibly frustrating when you turn off your bathtub faucet, only to hear water still rushing out. This constant flow of water is not only annoying but also leads to higher utility bills and potential water damage. Fortunately, a bathtub faucet that continues running after being turned off is usually an easy fix. With some basic DIY troubleshooting and plumbing repairs, you can stop the maddening drip-drip-drip in no time.

We'll also provide tips for diagnosing the problem and step-by-step instructions for completing repairs yourself. With the right guidance, you can solve the bathtub faucet turned off but water still running dilemma quickly, restoring peace and quiet to your bathroom.

Reasons Why a Bathtub Faucet May Keep Running

There are several potential causes of bathtub faucet that continues allowing water flow even after being shut off:

• Worn out washers or faulty valves - Over time, the washers and valves inside the faucet mechanism wear out. This allows water to leak through the faucet even when closed.
• Mineral buildup and corrosion - Hard water deposits and rust can prevent the faucet valve from fully closing.
• Cross-connections - If the hot and cold supply lines are incorrectly connected, water can backflow from one side to the other.
• Damaged or broken faucet parts - Issues with the faucet stem, cartridge, or ball mechanism can lead to leaks.
• Faulty diverter valve - If the diverter is not functioning properly, water may get misdirected to the tub spout.

Worn Out Rubber Washers

One of the most common reasons bathtub faucets keep running is worn out rubber washers inside the valve assembly. These washers create a watertight seal when the faucet is closed. Over time, the repeated opening and closing of the faucet causes these rubber pieces to flatten or crack. This allows water to sneak past the damaged washer even when the faucet is turned off.

Corroded or Damaged Valves

Corrosion and mineral deposits can also cause bathtub faucet valves to not fully close. Hard water contains high amounts of calcium and magnesium that slowly build up on faucet components. Rust particles from aging metal pipes can also accumulate on valve surfaces. These deposits prevent the valve from completely sealing off water flow when closed.

Cross-Connections Between Hot and Cold Lines

Another potential cause of a tub faucet that keeps running is cross-connected supply lines. The hot and cold water feeds should remain fully separate until reaching the faucet valve. If these lines become accidentally crossed, it allows water to backflow from one side to the other, even with the faucet off.

Issues With Faucet Cartridges, Stems, and Seals

The internal mechanisms that control water flow through the faucet can also develop faults. Common problem areas include damaged cartridges, broken stems, cracked washers, and leaky O-ring seals. Any of these issues can disrupt the faucet's ability to stop the water completely.

Faulty Diverter Valves

Tub/shower faucet combos utilize a diverter valve to switch between the tub spout and showerhead. If the diverter valve becomes stuck or misaligned, it can redirect water flow to the tub spout when you want it going to the showerhead only. This leads to water coming out of the tub faucet even after turning it off.

How to Troubleshoot a Bathtub Faucet That Keeps Running

Before attempting any repairs, it helps to diagnose the specific problem causing the bathtub faucet to keep running. Here are some troubleshooting tips:

• Check the faucet washers for signs of wear, tear, or misalignment.
• Inspect the valve for mineral deposits or corrosion buildup.
• Test the water temperature when the faucet is off to check for cross-connections.
• Take the faucet apart and examine the cartridge, stems, and seals for damage.
• Carefully inspect the diverter valve operation and alignment.

Turning off the main water supply to the house and then turning on the faucet to drain the lines can also help identify the leak source. Watch to see where drips are coming from as the water exits.

Be sure to completely turn off the water lines under the sink or at the main shutoff valve before taking anything apart to prevent uncontrolled water gushing.

Checking Faucet Washers and Valves

Rubber washers are among the most likely culprits for a tub faucet that keeps running. Examine washers closely for cracking, deformation, or obvious signs of age. Also check that they are seated evenly within the valve assembly.

Look for mineral deposits or corrosion that may be obstructing full valve closure. You'll need to clean or replace damaged valves.

Testing for Cross-Connected Lines

To check for cross-connected supplies, turn off the faucet and then turn it to hot only. If water still comes out after a minute, this points to a likely cross-connection issue. The cold water is backfeeding through to the hot side.

Diagnosing Faucet Component Failures

Removing the faucet handle and decor assembly gives access to the cartridge, stems, and seals. Look for cracks, loose parts, visible wear, or damage. Leaks originating from these areas indicate a broken internal piece needing replacement.

Inspecting the Diverter Valve

For tub/shower combos, switch between tub and showerhead options while watching the diverter. Water sneaking out of the tub faucet when set to shower mode means the diverter needs realignment or replacement.

Repairing a Bathtub Faucet That Keeps Running

Once the source of the problem is identified, fixing a tub faucet that won't turn off completely is usually a straightforward process. Here are some tips for completing common repairs:

• Replace damaged or worn washers and valves.
• Clean mineral deposits from valves with vinegar or replace valves.
• Install isolation valves to separate cross-connected hot and cold lines.
• Replace broken faucet cartridges, stems, and washers.
• Adjust or replace faulty diverter valves.

Replacing Worn Out Washers and Valves

If washers are cracked or flattened, swap them out for identical new ones. Apply plumber's grease to washers during reassembly to help maintain a watertight seal.

For corrosion-damaged valves, a deep cleaning or full replacement is required. Soaking overnight in vinegar can help dissolve some mineral deposits before scrubbing.

Correcting Cross-Connected Supply Lines

Properly separate crossed hot and cold feeds by installing isolation valves on each line under the sink. Turning off one side while leaving the other on will prevent backflow issues.

Fixing Leaky Faucet Components

Replacing damaged O-rings, cartridges, stems, or washers involves disassembling the faucet to remove the faulty part. Apply plumber's tape or lubricant to new seals and reassemble following manufacturer instructions.

Readjusting a diverter valve to align with tub and shower outlets often solves water misdirection issues. Tighten mounting nuts or replace the diverter assembly if simple realignment doesn't work.