I hear a hissing sound? What's wrong with the fluidmaster refill valve

The Fluidmaster valve is clogged or defective.

I installed a fluidmaster 400 and the refill cycle is very noisy. You can hear the water running thirty feet away. Any thought?

Plastic pieces inthere that give up after a while. I would go ahead and replace the assembly. But try this first,disassemble the top of the valve assembly and remove any debris. It could be the problem. There are rubber and

either the fill valve is running and water is draining into the bowl via the overflow tube in the tank or the flapper is bad (or foreign matter) and it is allowing water to escape into the bowl slowly...causing the fill valve to run every few minutes or so. hope this helps but if you need anything else just text me here:)

hiya:) This is a result of a very minor design error (i am a big fan of FluidMaster products) combined w/a slightly higher than normal water pressure situation or foreign matter stuck in the valve somewhere. try turning down the water pressure via the shuttoff under the toilet tank:)

The fill valve sounds if it is bad.Go to lowe's and get a fluidmaster fill valve(about $8) instructions included.turn off water and remove water from tank then disconnect supply tube,remove old fill valve install new,follow installation diagram,and the adjustment process to adjust the water level to correct level that should take care of your problem.

Hi,
With the fluidmaster you should have found instructions on how to take it apart and flush it out if dirt gets in the valve...
If not look up the fluid master website, the instructions are there...
You simply have dirt in the needle valve...

heatman101

try to replace the fluidmaster it is either that or your supply line is kinked,that or check the little black hose inside the toilet tank make sure that hose is not kinked,if neither hose is kinked replace the fluidmaster

First thing to do is figure out if the problem is with the fluidmaster or with the shutoff valve. If the water doesn't run at all after flushing, then instead of cycling the shutoff valve, just loosen the nut where the supply tube attaches to the fluidmaster (under the tank). If the problem is in the fluidmaster, it will start to squirt out at you, otherwise it won't. Then you know what to disassemble and attempt to repair, or replace.