Fix It Yourself: Why Your Kohler Toilet Won’t Stop Running & How to Solve It

Are you frustrated with your Kohler toilet that won’t stop running? We understand the annoyance and inconvenience this can cause. In this article, we will explore the common causes of a running Kohler toilet and provide you with a step-by-step guide to diagnosing and fixing the issue.

Whether it’s a faulty fill valve or a worn-out flapper, we’ve got you covered. Knowing how to address these problems can save you time, money, and water. So, if you’re ready to put an end to the incessant running of your Kohler toilet, keep reading to learn how to fix a Kohler toilet that won’t stop running.

The most important facts in a nutshell

  • Understanding the problem: Why your Kohler toilet keeps running – The role of the fill valve – How a faulty flapper can cause constant running
  • Step-by-step guide to diagnosing the issue – Inspecting the fill valve – Checking the flapper – Looking for leaks
  • How to fix a running Kohler toilet – Replacing the fill valve – Fixing the flapper – Addressing leaks

kohler toilet won't stop running

1/12 The role of the fill valve

In the realm of your Kohler toilet, there lies a formidable entity known as the fill valve . This guardian of water flow dutifully refills the tank after each flush, ceasing its flow once the tank reaches its full potential. However, a flawed fill valve could betray its purpose, squandering water and driving up your bill.

Seek out any visible signs of distress or deterioration to diagnose and rectify the issue. If uncertainty looms, do not hesitate to summon the aid of a plumber. By tending to regular maintenance and prompt repairs, you shall ensure the harmonious functionality of your fill valve and thwart the wastefulness of water.

2/12 How a faulty flapper can cause constant running

Beware the whims of a mischievous flapper within your Kohler toilet, for it may bring forth a cascade of troubles. A feeble flush, a ceaseless flow of water, or a toilet that refuses to flush – all harbingers of a flapper gone awry, failing to seal as it should. But the consequences of a faulty flapper go beyond mere annoyance.

The continuous stream of water not only squanders this precious resource but also drives up the utility bills. Moreover, it places undue strain upon the toilet’s delicate components, hastening their decay and burdening you with costly repairs. Fear not, for rectifying this quandary is a straightforward endeavor.

Turn off the water supply, empty the tank, and bid adieu to the worn-out flapper. Assess its condition and promptly replace it if necessary. Ensure the new flapper snugly fits its appointed place, reassemble the tank, and restore the water supply.

Finally, put the toilet to the test, verifying that the flapper now performs its duty as intended. By promptly attending to the capricious flapper, you shall avert the squandering of water and the perils of potential damage. Remember, regular maintenance and diligent inspection of your toilet shall ensure its seamless and efficient operation.

kohler toilet won't stop running

3/12 Inspecting the fill valve

Diagnosing a running problem with your Kohler toilet requires a thorough inspection of the fill valve. If you hear a constant trickle or notice a slow refill, the fill valve is likely to blame. There are several potential causes for a malfunctioning fill valve, including mineral buildup or a worn-out valve.

A misaligned or poorly adjusted float can also disrupt its function. To inspect the fill valve, follow these simple steps: turn off the water supply, remove the tank lid, and locate the fill valve. Check for any visible damage, such as cracks or leaks.

Test the valve by pressing down on the float. If the water stops, the valve is working correctly. If it continues to flow, further inspection or replacement is necessary.

By understanding the signs and causes of a faulty fill valve, you can effectively diagnose and resolve the problem. Remember to always shut off the water supply before inspecting or repairing any toilet components.

Are you struggling with Kohler toilet flush problems? Check out our article on how to fix common Kohler toilet flush problems for easy solutions and troubleshooting tips.

Possible Causes and Solutions for a Running Toilet – Tabelle

Problem Possible Cause Solution
Toilet won’t stop running Faulty fill valve Replace the fill valve with a new one. This is a common cause of a continuously running toilet. The fill valve is responsible for controlling the water flow into the toilet tank. Over time, it may become worn out or malfunction, leading to continuous water flow. Installing a new fill valve should fix the issue.
Toilet won’t stop running Malfunctioning flapper Fix or replace the flapper. The flapper is a rubber or plastic valve that seals the flush valve opening in the toilet tank. If it is not sealing properly, water will continue to flow into the toilet bowl, causing the toilet to run. Adjusting or replacing the flapper should resolve the problem.
Toilet won’t stop running Leaky toilet tank or pipes Address and fix the leaks. A leak in the toilet tank or pipes can lead to continuous water flow and a running toilet. Check for any visible leaks around the tank, supply line, and pipes. Repair or replace any damaged components to stop the water from escaping and causing the toilet to run.
Toilet won’t stop running Water pressure issues Adjust water pressure or install a pressure-reducing valve. High water pressure can cause the toilet fill valve to malfunction and lead to continuous water flow. If the water pressure in your plumbing system is too high, consider adjusting it or installing a pressure-reducing valve to regulate the water flow and prevent the toilet from running.
Toilet won’t stop running Improperly adjusted float Adjust the float to the correct water level. The float is responsible for shutting off the water flow into the toilet tank when it reaches the desired level. If the float is not adjusted properly, it may not shut off the water flow completely, causing the toilet to run. Adjust the float height to the recommended level to resolve the issue.
Toilet won’t stop running Obstructed flush valve Clear any debris or obstructions from the flush valve. A clogged or obstructed flush valve can prevent proper sealing, leading to continuous water flow. Use a toilet auger or plunger to remove any blockages and ensure that the flush valve operates smoothly.
Toilet won’t stop running Defective toilet handle Replace the toilet handle. A faulty or broken toilet handle can cause the flush valve to remain open, resulting in a running toilet. Replace the handle with a new one to ensure proper operation and stop the continuous water flow.
Toilet won’t stop running Incorrectly installed components Reinstall or adjust the components properly. If the toilet components, such as the fill valve, flapper, or flush valve, are not installed correctly, they may not function as intended, leading to a running toilet. Double-check the installation and make any necessary adjustments to ensure proper operation.
Toilet won’t stop running Faulty toilet fill valve shut-off assembly Replace the shut-off assembly. The shut-off assembly is responsible for stopping the water flow into the toilet tank when the desired water level is reached. A defective shut-off assembly can cause continuous water flow and a running toilet. Replace the assembly with a new one to resolve the issue.
Toilet won’t stop running Water level adjustment screw or rod issues Repair or replace the adjustment screw or rod. The water level in the toilet tank is controlled by an adjustment screw or rod. If these components are damaged or malfunctioning, the water level may be too high, causing the toilet to run. Repair or replace the adjustment screw or rod as needed to fix the issue.
Toilet won’t stop running Defective water supply line Replace the water supply line. A damaged or faulty water supply line can cause continuous water flow into the toilet tank, resulting in a running toilet. Inspect the supply line for any leaks or defects and replace it with a new one if necessary.
Toilet won’t stop running Lime or mineral buildup Clean or descale the affected parts. Over time, lime or mineral deposits can accumulate in the toilet tank, fill valve, or flush valve, affecting their proper functioning and causing a running toilet. Use a descaling solution or vinegar to remove the buildup and restore optimal performance.
Toilet won’t stop running Cracked or damaged toilet tank Replace the toilet tank. If the toilet tank is cracked or damaged, it may not hold water properly, causing continuous water flow and a running toilet. In such cases, replacing the entire tank is necessary to resolve the issue.
Toilet won’t stop running Electrical issues with smart toilet models Consult an electrician or contact the manufacturer for assistance. Smart toilet models may have electrical components that can cause a running toilet if they malfunction. If you suspect an electrical issue, it is best to seek professional help or contact the manufacturer for guidance and troubleshooting.

4/12 Checking the flapper

If your Kohler toilet seems to have a mind of its own, constantly making noise and refusing to fill up properly, there may be a simple culprit to blame: the flapper. This small, but mighty, component can wreak havoc on your water bill and flush efficiency. To determine if the flapper is indeed the problem, listen for a persistent hissing sound and observe if the water in the toilet bowl is constantly flowing.

If these signs are present, it’s time to take a peek inside the tank. Open the toilet tank and take a close look at the flapper. Look for any signs of wear, damage, or mineral deposits that could hinder its sealing ability.

Cracks or tears are especially concerning. If you spot any issues, it’s best to replace the flapper with one that is compatible with your specific Kohler toilet model. By regularly checking and addressing flapper issues, you can ensure that your toilet runs smoothly, saving both water and your sanity.

Don’t let a faulty flapper disrupt the tranquility of your bathroom oasis.

If you’re struggling with your toilet not filling the tank properly, check out our article “Toilet Not Filling Tank” to find out the common causes and simple solutions to fix the issue.

5/12 Looking for leaks

In the realm of bathroom maintenance, a leaking Kohler toilet can be quite the conundrum . The quest to uncover and resolve the issue begins with a thorough investigation of the toilet’s base for any telltale signs of water or dampness on the floor. Additionally, one must embark on an inspection of the supply line connections, fill valve, and tank bolts, as they are often the culprits behind these unruly leaks.

The origins of these leaks can be attributed to several possible causes. A worn-out wax ring, a faulty supply line, or loose connections stand as potential villains in this perplexing tale. Furthermore, leaks may manifest if the tank bolts are not firmly secured or if the fill valve fails to perform its duties with precision.

To vanquish these leaks and restore order to the porcelain throne, one must first tighten any loose connections or bolts that have been discovered. If this valiant effort fails to silence the leaks, the time may have come to replace the wax ring or supply line. Before embarking on this noble mission, it is imperative to turn off the water supply, for one must always tread cautiously in the realm of plumbing.

Should uncertainty cloud your path, it is wise to summon the expertise of a professional plumber, whose wisdom in such matters is unparalleled. Swift action is of utmost importance, for leaks left unperturbed can wreak havoc and squander precious water. By diligently inspecting for leaks, discerning their origins, and undertaking the necessary steps to remedy them, you shall ensure the seamless and efficient functioning of your Kohler toilet.

kohler toilet won't stop running

Did you know that a running toilet can waste up to 200 gallons of water per day?


My name is Warren and I am a professional plumber licensed and insured in the State of California. I have been in the business for over 10 years and have undertaken small and large projects including bathroom renovation, toilets, garbage disposals, faucets, sinks and kitchen plumbing jobs. This site is based on my experience with toilets. I have installed the best brands and models in all sizes and shapes. I hope this helps you with the unbiased information that you need to make the right decision.


6/12 Replacing the fill valve

In the realm of household plumbing, there are few things more vexing than a perpetually running toilet . The culprit behind this watery mischief? None other than the fill valve.

This humble yet essential component controls the flow of water in your toilet, and when it falters, it can result in a wasteful cascade of liquid. Now, you may be wondering, how can one discern whether the fill valve is to blame? Well, dear reader, listen closely.

If you have valiantly attempted to troubleshoot and repair the fill valve, only to have your efforts fall flat, it is a telltale sign that a replacement is in order. Furthermore, if you spy water escaping from or detect visible damage on the fill valve, it is a clear indication that a new one must be procured. To bid adieu to the old fill valve, embark upon a journey of removal.

Begin by shutting off the water supply and flushing the tank to empty its contents. Then, sever the connection between the water supply line and the fill valve, and gently unscrew the nut that anchors the fill valve to the tank. Once the old fill valve has been banished, purify the surrounding area and prepare it for the arrival of its replacement.

Ah, the selection of this replacement is a matter of utmost importance. Seek out a fill valve specially crafted for Kohler toilets, for only then can you ensure a harmonious union of form and function. Additionally, it is wise to opt for a fill valve with adjustable height settings, as this will allow you to optimize the water level in your toilet’s tank.

By embarking upon this journey of repair, armed with the knowledge of these steps and armed with the perfect replacement fill valve, you shall vanquish the running conundrum of your Kohler toilet. No longer shall water be squandered in vain! However, should doubt cloud your path or if you prefer the aid of a seasoned professional, do not hesitate to summon a reliable plumber.

They shall come to your aid, swift as a river, and restore tranquility to your porcelain throne.

kohler toilet won't stop running

7/12 Fixing the flapper

Don’t rush to call a plumber when you encounter a faulty flapper in your Kohler toilet. There are simple DIY techniques you can attempt first. Start by adjusting the chain that connects the flapper to the flush lever, ensuring a secure seal.

If that doesn’t resolve the issue, clean the flapper and its surroundings to eliminate any debris or mineral buildup. Regularly inspect the flapper for wear and tear, and if necessary, replace it. To determine if a replacement is needed, perform a dye test by adding a few drops of food coloring to the toilet tank and waiting 15 minutes.

If the colored water seeps into the bowl, it’s time to replace the flapper. By following these steps, you can fix a faulty flapper and prevent water wastage. Remember, if you’re uncertain or the DIY methods prove ineffective, it’s best to seek the expertise of a professional plumber.

How to Fix a Kohler Toilet that Wont Stop Running

  • Kohler toilets are known for their quality and durability, but like any other toilet, they can develop issues over time.
  • A common problem with Kohler toilets is that they won’t stop running, which can be both annoying and wasteful.
  • The fill valve is an essential component of a toilet that controls the flow of water into the tank. If it becomes faulty or worn out, it can cause the toilet to constantly run.

8/12 Addressing leaks

Don’t let leaky toilets dampen your spirits. Act swiftly to avoid damage. Faulty flappers and damaged fill valves are often to blame for leaks in Kohler toilets.

These culprits can cause a steady stream of water from tank to bowl. To fix leaks, check for damages, replace worn-out parts, adjust water levels, and tighten connections. Timely intervention is key to preventing water damage, skyrocketing bills, and the growth of mold.

Don’t hesitate to take action when you spot signs of leaks in your Kohler toilet.

If you’re dealing with a leaking Kohler toilet tank, check out our article “Kohler Toilet Tank Leaking” for tips on how to fix it and prevent future leaks.

kohler toilet won't stop running

9/12 Signs the problem is bigger than a DIY fix

If you come across any of these telltale signs with your Kohler toilet, don’t underestimate the gravity of the situation. Unusual or excessive noise emanating from the toilet may hint at a larger problem, possibly involving the fill valve or flapper. Even if you attempt to resolve the issue yourself, if the water flow persists, it may be time to seek the expertise of a professional plumber who can inspect the fill valve or flapper.

Difficulty flushing or incomplete flushes could be indicative of a pipe blockage or a malfunctioning flushing mechanism. When faced with these unmistakable signs, it is crucial to reach out to a seasoned plumber. With their extensive knowledge and specialized tools, they can diagnose and rectify the issue, ensuring that your Kohler toilet regains its seamless operation.

Remember, addressing these concerns promptly not only prevents further damage but also curbs unnecessary water wastage .

Is your Kohler toilet constantly running? Don’t worry, there’s an easy fix! In this video, you’ll learn how to solve the problem and stop the running. Get ready to save water and put an end to that annoying sound!

YouTube video

10/12 Choosing a reliable plumber

When it comes to hiring a plumber to fix your toilet, there are a few key things to keep in mind. Start by making sure they have the proper licensing and insurance to guarantee their expertise and protection. It’s also helpful to read customer reviews to get an idea of their reputation and the quality of their work.

Don’t hesitate to ask friends or neighbors for recommendations based on their own experiences. Remember, finding a reliable plumber is essential for ensuring your toilet repairs are done right and will last. Take into account licensing, insurance, and customer reviews to find a trustworthy professional for your toilet repair needs.

11/12 Regular maintenance tips

Maintaining your Kohler toilet is essential for its smooth operation. Here are some easy tips to prevent problems and maximize performance. Start by regularly cleaning and inspecting the toilet tank to remove debris that can cause clogs and reduce flushing power .

Next, check and adjust the water level in the tank to ensure strong flushes and minimize water wastage. Keeping the water at the right height will optimize your toilet’s performance. Lastly, lubricate the moving parts of the toilet mechanism, like the flush valve, fill valve, and flapper, to reduce friction and ensure flawless operation.

Use a compatible lubricant to avoid any damage. By following these maintenance tips, you’ll keep your Kohler toilet in excellent condition and avoid any plumbing issues in the future. Remember, preventing problems is always better than dealing with them later on.

kohler toilet won't stop running

Steps to Fix a Kohler Toilet That Wont Stop Running

  1. Turn off the water supply to your Kohler toilet.
  2. Lift the lid off the toilet tank and locate the fill valve.
  3. Inspect the fill valve for any signs of damage or wear.
  4. If the fill valve is faulty, remove it by unscrewing it from the tank.
  5. Install a new fill valve by screwing it into the tank.
  6. Check the flapper inside the tank for any cracks or leaks.
  7. If the flapper is damaged, replace it with a new one.

12/12 Choosing quality replacement parts

When it comes to choosing replacement parts for your Kohler toilet, nothing beats the performance and reliability of genuine Kohler parts. These parts are specifically designed to seamlessly fit and function with your toilet, guaranteeing optimal operation. With high-quality materials and expert craftsmanship, you can rest easy knowing that your toilet will stand the test of time.

On the other hand, opting for low-quality replacement parts may seem like a tempting choice due to their lower price. However, it’s important to remember that they often fall short in terms of quality. Ill-fitting parts can result in leaks and other problems, while their durability leaves much to be desired.

To steer clear of these issues, it’s crucial to purchase replacement parts from trusted suppliers or directly from Kohler. Look out for official logos or markings that signify authenticity. Additionally, take the time to read customer reviews and testimonials to gauge the performance and dependability of the parts you’re considering.

By investing in genuine Kohler replacement parts, you can ensure that your toilet operates at its absolute best, without the hassle and headaches that come with subpar alternatives.

If you’re dealing with a Kohler toilet that keeps running, check out our article “Kohler Toilet Keeps Running” to learn how to fix the issue and keep your toilet working properly.


In conclusion, understanding why your Kohler toilet keeps running is crucial for resolving the issue. By recognizing the role of the fill valve and the potential problems with the flapper, you can effectively diagnose the problem. The step-by-step guide provided in this article offers a clear and concise method for troubleshooting the issue.

Whether it’s inspecting the fill valve, checking the flapper, or addressing leaks, the solutions provided can help you fix a running Kohler toilet. However, if you encounter signs that the problem is beyond a DIY fix, it’s advisable to call a professional plumber. Additionally, implementing regular maintenance tips and choosing quality replacement parts can help prevent future issues with your Kohler toilet.

We hope this article has been helpful in resolving your toilet problem, and we encourage you to explore our other informative articles on plumbing maintenance and troubleshooting.


What is the most common reason a toilet won’t stop running?

Don’t sweat it! When your toilet won’t stop running, it’s often an easy problem to solve. The three main culprits are a worn-out or dirty flapper, a chain that’s either too long or too short, or a float that’s not in the right position. To get started, the first thing you should do is shut off the water supply to the toilet.

What to do when a toilet won’t stop running?

Here are six common reasons why your toilet may be running, listed from most to least common: 1. Check the flapper chain: Often, fixing the chain is the simplest solution to stop the toilet from running. 2. Check the flapper: Ensure that the flapper is properly sealing the flush valve. If it’s damaged or worn out, it may need to be replaced. 3. Check the water level: Make sure that the water level in the tank is not too high or too low. Adjust it accordingly to prevent continuous running. 4. Look at the float ball (especially in older toilets): Examine the float ball to ensure it’s not damaged or stuck. If necessary, clean or replace it to restore proper function. 5. If you have a float cup: Similar to the float ball, inspect the float cup for any issues like damage or obstruction. Cleaning or replacing it may be necessary. 6. Check the fill valve: Verify that the fill valve is functioning correctly. If it’s malfunctioning or worn out, it may need to be repaired or replaced. Remember, addressing these common causes can often resolve a running toilet issue without the need for professional assistance.

What causes a toilet to continuously run?

Here are six possible reasons why your toilet might be running: 1. High float: If the float in your toilet tank is set too high, it can cause the toilet to constantly run. Adjusting the float to the appropriate level can help resolve the issue. 2. Aging flapper: Over time, the flapper, which controls the water flow from the tank to the bowl, can deteriorate and become less effective. Replacing the old flapper with a new one can stop the toilet from running. 3. Incorrectly sized refill tube: The refill tube, responsible for refilling the tank after each flush, needs to be properly sized for your toilet. If it is too long or too short, it can cause water to continuously run. Ensuring the refill tube is the correct length can help fix the problem. 4. Blockage: A blockage somewhere in the toilet’s pipes or trap can lead to a constantly running toilet. Clearing the blockage can restore proper functioning. 5. Faulty flush valve: The flush valve, which controls the release of water from the tank into the bowl during a flush, can become defective or worn out over time. Replacing the faulty flush valve can resolve the issue of a running toilet. 6. Water pressure issue: In some cases, high water pressure can cause a toilet to run continuously. Installing a pressure-reducing valve can help regulate the water pressure and prevent the toilet from running unnecessarily. Remember, addressing these issues promptly can save water and prevent potential damage to your toilet and plumbing system.

Why does my Kohler toilet run periodically?

If your toilet keeps turning on and off for a few seconds without any reason, it is probably because of a broken flapper. The flapper’s main function is to close and seal the tank once enough water has passed through, but if it is cracked or deteriorating, it won’t be able to create a proper seal, causing water to continuously flow through and the toilet to run intermittently. This can result in wasted water and potentially higher water bills.

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