Question about Toto Toilet Onepiece Ultramax MS854114SL.12

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The chain keeps getting tangled and the toilet keeps running. The chain is very difficult to untangle

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There is too much slack in the chain. when the handle is at rest, there should be very little slack in the chain. and when you flush, don't slam the handle. also, if the handle is all the way down when you flush and the flapper is being pulled too high, leave a one link slack. and the hook that holds the chain, clamp it closed to avoid the chain getting rehooked on it.

Posted on Nov 13, 2009

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Sound like the flapper is not sealing. Check to make sure taht the chain or whatever controls the flapper movement is not too tight, holding the flapper up and, that it is not so loose that it gets tangled and/or gets caught in between the flapper and sealing surface. You should maybe be able to hear the toilet leaking and if so, push down on flapper and, if the leak stops, you have definately found your culprit. The first thing I would do is check the adjustments and if all else fails, replace the flapper and see what happens. Unless it's leaking on the floor, it's really the only way you would lose the water out of the back tank, unless you could possibly have a cracked or a bad seal on the overflow tube assembly.

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1 Answer

Toilet which keeps running, but not every time. I have to jiggle the handle to make it stop

If you take the top off of the tank you will see a lever about 12 inches long that the flush handle moves up and down. To this is attached one end of a small chain. The other end of the chain is attached to the actual flush valve (which might be a flapper or a plastic column. The chain is probably getting a little tangled so that it does not allow the flush valve to return all of the way back down. You can confirm this by waiting until it happens again, then remove the tank top and look before you jiggle the handle. You might be able to remedy this by moving the hook on the end of the chain that is getting tangled. However, I have had better luck by replacing the chain with a flexible, but durable cable. I happened to have some large o-rings, which I cut, then put a knot in each end (after installation). Nylon string might work, but be sure to fuse the ends with a match. If you want to try the o-ring idea, go to any automotive service shop and ask them for a large o-ring, about the size that are used on disc brake pistons. Good luck.

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1 Answer

My champion 4 two piece comfort height elon toilet keeps running. I have to turn the shut off valve off to stop it. Help! John

take off the tank cover and you'll see "the flapper" not sealed against the hole where the water goes to the bowl, the chain that holds the flapper might be tangled or flapper is real bad,'ll see what the problem is,..

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1 Answer

The toilet refill seems to keep running, but there's no flooding just refilling.

Open the back tank cover and check the "flapper" it is the black thing that the chain pulls up on to let the water out of the tank. If it does not go all the way down tight then the water will just keep running through the toilet and out the drain.
Sometimes it will crack and then not seal, someimes it gets brittle and the edges roll up so it isn't flat and the water runs through.
The chain can also catch or tangle and bcome too short holding the flapper up.
If all else fails there should be a valve on the bottom left side at the fill ppe. Turn that off till you can get it repaired.
I hope this helps youout to get your problem solved.

Thanks for using Fixya!!


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1 Answer


You should be able to take the housing loose with about 4-6 torx head bolts/screws and get in there and untangle the rope. May not even have to take the housing off, just loosen it. Good Luck!

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