3 ways to tell if the filling valve is defective

 The toilet runs constantly

This is a common sign that the fill valve of a toilet is broken. However, in addition to the fill valve, there are other factors that can cause the toilet to malfunction, so first look inside the tank. If water flows over the fill valve and into the overflow hole, the float may be incorrectly adjusted.

Simply bend the float arm downwards so that the float shuts off the water at a lower level. If this works, the filling valve is functioning properly. Next, look carefully at the chain that runs from the handle to the door.

Occasionally, this chain twists and does not extend far enough to allow the door to seal properly. In this case, the filling valve is constantly actuated, as water escapes from the tank as soon as it is pumped in.

Finally, check the flapper. Just like when chaining, if the flapper is the wrong size or does not fit correctly over the drain hole, the fill valve will continuously try to fill the tank. Try holding the flapper down to make sure the drain hole is sealed and watch the water rise to the correct height. If the float reaches the stop and the tank continues to fill, the fill valve is faulty.

The toilet does not flush or the flush is weak

A weak or absent flush when the handle is pressed can mean that the toilet tank is not being filled with water properly. A weak flush can also be caused by a shutoff float set too low, so try bending the float arm upwards to check that it is the fill valve first. A lack of flushing probably means that the fill valve is broken or blocked and is not sending water to the tank.

The tank takes a long time to fill

If the toilet takes a long time to fill after flushing, it is possible that water is having difficulty passing through the fill valve. Before purchasing and replacing the entire valve, check that there is no obstruction that is easy to remove.

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