How to Fix a Kohler Toilet That Keeps Running?

Kohler toilets are one of the most common toilets in all our houses. Most of the time, people can be seen having issues here and there with their toilets once it’s been quite a while since they’re using them.

The issues can be of different kinds. From the fill valve issues to flapper issues, the solutions are different applied. Your toilet can run from time to time or nonstop depending on the kind of problem you’re facing.

Without further ado, let’s get into how you can inspect more into the problem and fix them.

Why does my toilet run from time to time?

A lever on a toilet of Kohler lifts an arm pulling on a thread. The chain lifts the valve, which allows water to pump through and flush the tank. When the bracelet cuts the string, the flapper mechanism re-fills the toilet.

How to Fix a Kohler Toilet That Keeps Running

If your toilet runs on and off, a toilet tank leak is most likely a problem. And if the bathroom is not washed, the leak allows the tank to flow with urine. A variety of factors may trigger the leak.

Another possibility is that the flapper is not correctly sealing or that the fill valve is missing.

Identifying the Problem

Before you act on the problem, you must run a quick test to determine the issues.

We recommend that you mark the water level in your tank and turn off the main water supply line. Wait for a few hours to see if any changes were made. The changes will speak tons for what kind of problem you may be facing.

Some of the evident changes are

  • The depth of the water has not changed: No crack. No leak. This usually means that the filling valve on the left side of the tank is locked open and has to be removed or cleaned.
  • The water depth is at the level of the flapper: Since the flapper or seal is worn, water leaks into the cup. As a solution, the flapper or seal must be removed.
  • The stream was entirely out: Because of a broken gasket in the pipe, water leaks into the flush valve. It would need to be replaced.
  • Just a limited volume of water was reduced: The cause of the leak can be challenging to identify. On the other side, the flush valve may have caused slight damage and could be replaced.

Identifying the Location

A basic test may be used to determine whether or not a toilet leak is a problem. If it’s the case, you’ll be able to find where it is precise. Firstly, the toilet tank cover should be removed. It’s recommended that you wait until the toilet has ceased to work.

Black food coloring should be added to the toilet bowl. By looking at where the color goes, you will figure out which way the leak is coming from.

If your flapper is leaking, before everything, you should get a paper towel or something to put pressure on. Then, proceed to hold on top of it tightly.

Put some food coloring on the flapper to see how it reacts as it is pressed against it. If it still doesn’t function, lengthen the chain holding your flapper in place.

It’s time to change the flapper if the food coloring starts to drift into it.

Replacing the Flapper

To replace the flapper, follow these steps.

Don’t forget to turn off the tap in this step. Next, turn the water supply clockwise to turn off the tap. Later, the reservoir should be emptied. To clear the tank out, remove the flapper as soon as possible. You should remove the flapper without delay.

The flapper secures the flush valve. On each side of the flush valve, a hinge can protect or clamp it into a ring. Roll it out and bring it off on the flush valve from the hinges.

Remove the arm chain lifter from the arm lifter. This usually is as simple as cutting the chain from the arm clip of the lifter.

Replace the present flapper. Ensure that you have identical sizes of flappers. The old and the new ones must have similar models. Then reverse the process of disassembly. Try to leave about three slack links while the chain is linked.

Valve Issues

Your valve is a simple mechanical component. The float is an air bubble that floats above the water. It shuts the water off as it reaches a certain level. It starts the water as it comes under the level.

There are two traditional float designs. Most of the time, they are cylinders around the fill valve. They’re designed to look like a pole situated on the left. First, jig the float up and down, helping break down the waste and solving the issue.

Fill Valve Replacement

It is not difficult to replace the fill valve and resolve the dilemma. Make sure it fits in your toilet when selecting a replacement, especially if it is a generic type. To patch your valve, take these steps.

First of all, turn the supply of water off. Turn the team in the direction of the clock until it stops. Delete the supply line from the rim of the fill valve.

Drain the tank. Drain the tank. To remove more of the bath, rinse the toilet. However, the valve is fully released, causing the residual water under the flush valve to drain to your surface. To make sure no water escapes, you can place a towel or a bucket under the fill valve’s lock nut to capture the rest of the stream.

Remove lock. Remove valve. First, slip the tube overflow filling tube. Now screw the lock nut into the bottom of the tank and secure the fill valve.

Install the most recent valve. Place the fresh fill valve over the bath for 1 inch of float. Now snugly but not forcefully screw the locknut into the valve plate. Then, you can simply attach the refill hose to the overflow tube.

Know More:
Why Does My Dual Flush Toilet Keep Running After Flush?
Why Your Toilet Smells Even After Cleaning: Smelly Toilet Remedy
How to Unclog a Toilet Full Of Poop and Water


Therefore, we hope you have gathered enough knowledge about knowing how to fix a Kohler toilet that keeps running. Don’t forget to handle all the steps with utmost care ad precaution.

If anything doesn’t sit right with you, ensure to have a professional plumber come and take a look at the issue. You can also find support from Kohler’s customer service. Till the next time, happy flushing!

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