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Remove and clean the flush valve and the flush valve seat(it is the flap that opens up to allow water to flush the toilet). Once the edges of the valve and the seat are cleaned, possibly with "0000" grit bulldog steel wool, it should not leak anymore. To make sure it is not leaking, once tank has refilled completely, put some food die in the tank. If, after 10-15 minutes, the water in the toilet bowl is colored, you have a leak from the flush valve. Replacing the flush valve is very easy - just bring the old one with you to the hardware/plumbing store and ask for a replacement. Blessings and good luck!!
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 through the flush valve slowly...causing the
tank to drain and the fill valve to run every few minutes or so. start by inspecting/cleaning or replacing the flapper and hopefully that will do it because a one piece toilet flush valve
needs a special wrench,to remove it, that you use with a ratchet. If you buy a new
flush valve, it comes with the wrench (glorified piece of plastic) and
is not too difficult to get the flush valve out. you can get a replacement at http://www.plumbingpartsdepot.com/ They do mail order, too. All you need is the
toilet type - a four digit number embossed in the tank starting with a
2. hope this helps but if you need anything else just ask:)
Sounds like the flapper is leaking water out of the tank. The flapper is the rubber valve that comes up and down every time you pull the flush lever. It is located in the tank at the bottom in the center. Very cheap part to replace.. Just turn the water off to the stool, take the top of the tank off, hold the flush lever down until all the water is out of the tank, reach in to the tank, disconnect the flush chain from the flapper, and disconnect the flapper arms holding to the stem. You can buy a flapper at any hardware store even at wal mart. Hope this helps.
Sounds like the flapper isn't sitting properly. Take the lid off the tank and put a few drops of food coloring in it. Let it sit for a while (do not flush). If the water in the bowl turns that color, that means the flapper needs replacing. Simple to do and costs about 5 bucks. Good luck
Most likely, you do not have a good seal on the flapper valve at the bottom of the tank. To confirm, try this: Turn off water and flush toilet. Then lift up the flapper valve and put a light coating of vaseline on the mating surface where it contacts the toilet tank when closed. Turn water back on and see if it continues misbehaving. If that fixes it, it was a bad seal. Usually that is all it takes.
I have exactly the same problem, in fact it could have been me writing this - 3 toliets fine, main bathroom hisses.
The Geberit flushing ciphen on the left (the smaller one) has been replaced and there is still a problem. If you look carefully,the water level needs to come up over the lip of an opening on the Geberit part and this causes the valve mechanism to shut off and stop the hissing. It is fine for about 40 minutes and then the hissing starts again if you don't flush it. The reason is that the water level has gone down but there is no obvious signs of where the water is going. It could be that the central flush mechanism is leaking slightly. I am going to replace this part next.
If I were you I'd see if you are getting any water leakage into the pan when toilet not in use to see if the water level in the cistern is going down
You have to remove the tank bolts on either side of the flush valve. Once you remove it, there is a tank to bowl seal that will need to be replaced. Remove the old seal and there will be a huge plastic nut that holds the flush valve to the tank. Remember to use new hardware when reassembling the toilet so that it won't leak sooner rather than later!
You can either replace the plastic diaphram under the top cap or you can replace it easily with another fill valve. There is a small screw that you can try to adjust as well but this is only a temp. fix.