How to Fix Loud or Broken Fill Valve

1. First, we have to determine if the water level inside the toilet tank is rising above and spilling into the top of the flush valve overflow tube.  If the water level rises above the top of the flush valve overflow tube, the fill valve may not be set to the correct height. 

2. Confirm that the corner of the fill valve cover lines up with the top of the overflow tube (where the fill valve cover and the black box meet). If the valve is set too high, turn off the water supply and flush the toilet. 

3. Adjust the height of the valve by twisting the top half of the valve counterclockwise and push down on the valve until the corner of the fill valve cover lines up with the top of the flush valve. 

4. Turn the top of the valve clockwise to lock it in place. If the fill valve is still hissing and the water level is still rising and spilling into the overflow tube the fill valve may need to be serviced. Check out our service video here.

If the water level is not rising above the top of the flush valve overflow tube, and the valve is running or hissing, a leaky flapper is likely the cause of the running valve.

1. To test for a leaky flapper, turn the water supply off and mark the water level in the tank with a pencil. 

2. Leave the water supply line shut off for at least 30 minutes. If the water level drops below the pencil mark there is a leak in your tank and is an indication that the flapper may not be sealing properly.  

3. Leave the water off for a couple of hours and see where the water level drops. If the water level drops to the flapper, your flapper is leaking and needs to be replaced. If it drops to a point on your overflow tube or your tank is drained completely, your flush valve needs to be replaced.