How to Troubleshoot the Float on a Kohler Toilet

Kohler toilets use two types of float systems to regulate the water in your toilet tank. One is the standard plastic ball on a long copper arm, the other is an all-in-one design called a Fluidmaster that incorporates both the toilet float and the fill valve in one unit. Although they work exactly the same, they are completely different designs and need to be addressed separately when troubleshooting a problem with either of them.

High angle view of domestic bathroom
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Standard Ball Float

Step 1

Remove the lid on your tank.

Step 2

Check to see if the float is actually floating. If it is and the toilet is running constantly you can adjust the ball float.

Step 3

Grab the float arm in both of your hands and bend it downwards slightly. This action will cause the float to go deeper into the water and therefore, come up faster, shutting off the water supply sooner.

Step 4

Check to see if the float is partially or fully submerged in the water. If it is, the float is cracked or has a hole in it and it cannot be adjusted, It needs to be replaced. The actual float itself unscrews and can be taken into a hardware store to match up with a new one that can be screwed back on.

Fluidmaster Toilet Float

Step 5

Remove the lid on your tank.

Step 6

Locate the Fluidmaster float which will be integrated with the fill valve, usually on the left side of the toilet. It should bob up and down in the water of the toilet tank.

Step 7

Running water means the float needs to be adjusted. There will be a Phillips screw on top of the unit that can be adjusted by turning it with a Phillips screwdriver.

Step 8

Turn the screw clockwise and the float will be pushed deeper into the water. When that happens, just like a standard float, the running water will turn off sooner. If there is not enough water in the tank, you can turn the screw the opposite way which will cause the float to sit higher and allow more water in.

Step 9

If the float cannot be adjusted, or it sinks to the bottom of the toilet, either the mechanism is broken or the float is cracked, and will need to be replaced.