Some of the most common problems that can be fixed by the Fluidmaster troubleshooting chart include, the toilet fill valve running non-stop and too much water in the toilet bowl. New toilet parts may be needed in order to fix some of these problems.
To fix a toilet fill valve that does not turn off, check for debris in the seal area, turn off the water supply and flush the tank. Reach inside the tank with your right hand under the float cup, and lift it up. With the left hand, turn the cap and lever counter-clockwise 1/8th of a turn to unlock. Remove the cap and lever from the valve body, and inspect for debris on the seal and the valve portion in the tank.
Free the debris with the pressure of the water from the exposed opening of the valve and reassemble. If no debris was found, the seal needs to be replaced.
If there is too much water in the toilet bowl, place a clip or clamp on the overflow pipe to reduce the amount of water passing to the bowl. For toilets that do not require refill water to the bowl, attach the angle adapter so that the water flows back into the tank. To do so, set up the hose connection to the overflow pipe in a way that makes the water flow back into the tank.