Fluidmaster produces a line of fill valves for toilet tanks. When the toilet is flushed, the water in the tank will empty into the toilet. As the level of the water in the tank drops, a float will also drop, triggering the valve to open, which will then refill the tank. Fluidmaster fill valves are solidly built and will last for many years, usually requiring no attention at all. If you have a problem with your Fluidmaster fill valve, follow these simple troubleshooting steps to try to resolve the problem.
If the fill valve cycles on and off without the toilet being flushed, check to see if the black vinyl refill tube attached to the fill valve reaches too far into the overflow pipe. This can cause siphoning action to occur in the overflow pipe, which will lower the water level in the tank, causing the valve to turn on intermittently. Make sure the black vinyl refill tube is properly attached to the top of the overflow pipe, using the angle adaptor to ensure that tube is above the water level.
Examine the tank ball or flapper for wear, debris or misalignment. This can prevent the ball or flapper from sealing properly to the bottom of the tank, allowing it to leak. This will lower the water level of the tank and trigger the tank to refill.
Examine the overflow pipe and fill-valve assembly for excessive wear or corrosion that may cause the water level in the tank to drop. Replace the overflow-pipe fill-valve assembly, as needed.
Check for debris, such as calcium deposits, tiny pieces of corroded pipe, rocks or rubber carried by the water supply that may be lodged in the fill valve's seal by shutting off the water supply and removing the valve top. Place an inverted cup or glass over the valve assembly in the toilet tank, and turn the water back on momentarily to flush out any obstruction. Turn the water off. Check the top of the valve, and clear any obstructions there. Also check for wear or damage to the seal in the valve, and replace the seal if necessary. Reassemble the valve.
Check the water level adjustment clip that attaches the float to the link arm that operates the valve. Reset the tank's water level by lowering the water level adjustment clip.
Check the metal tank-lever linkage for corrosion that may be preventing the flapper from closing completely, and replace the linkage if necessary.
Check that the water supply to the tank is turned on.
Ensure that the float is not obstructed by cleansing agent containers or other items within the tank.
Check to see if the top of the valve is properly locked in place. Shut off the water supply. Remove and then replace the valve top, ensuring that it fits correctly. Turn the water supply back on, and test the valve to ensure that is functioning properly.
Check the refill-tube angle adaptor to ensure that it is pointing straight down into the overflow pipe.
Check the water supply for inadequate flow, and adjust the water-shutoff valve accordingly.
Ensure that the float is not scraping against the side of the tank during refilling.
Check the seal in the valve to see if it is swollen. Shut off the water supply. Open the valve assembly, examine the seal and replace it if necessary. Reassemble the valve, and turn the water on.
Check for debris that may be lodged in the valve's inlet passage by shutting off the water supply and removing the valve top. Use a straightened coat hanger to clear the inlet port of obstructions. Place an inverted cup over the valve assembly in the tank, and turn the water on to flush out any obstruction. Turn the water off. Reassemble the valve, and turn the water back on.
Check the water supply line to the tank for any obstruction. Clear the obstruction if necessary.