Question about Toto MS853113S#11 UltraMax Round Toilet, Colonial White

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Water continues to pour into the overflow tube at end of cycle

Toilet is only six months old, the house has a well and lots of debris flow into the tank, though the flapper does not seem to leak.

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I am also on a well and had what sounds like the same problem, so I contacted Toto tech support at techsupport@totousa.com.  They responded within 24 hours with information which enabled me to successfully resolve the problem.  
Basically, they provided a set of diagrams and instructions which enabled me to take apart the flush valve, clean it, and reassemble it.  It took less than 15 minutes, and cleared up the problem immediately.
By-the-way, those instructions also mention an annual cleaning of the flush valves, which might well prevent future problems.  A filter to remove debris from the water supply is probably a good idea, too.

Posted on Mar 28, 2009

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HAVE YOU CHECKED THE FLOAT OR ABJUSTED IT ? ALSO WITH A WELL YOU MIGHT WANT TO THINK ABOUT PUTTING IN A IN-LINE FILTER ON YOUR WATER COMEING IN FROM YOUR WELL TO SAVE WEAR AND TEAR ON YOUR APPLIENCES AND YOUR WATER SOFTNER

Posted on Mar 09, 2009

  • JEFFrey BAKER
    JEFFrey BAKER Mar 09, 2009

    HAVE YOU CHECKED THE FLOAT OR ABJUSTED IT ? ALSO WITH A WELL YOU MIGHT WANT TO THINK ABOUT PUTTING IN A IN-LINE FILTER ON YOUR WATER COMEING IN FROM YOUR WELL TO SAVE WEAR AND TEAR ON YOUR APPLIENCES AND YOUR WATER SOFTNER

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Have the Toto Ultramax II toilet and it was installed 3 months ago. Have an issue where the GMAX fill valve is not functioning properly. The water keeps running because it always go over the fill line....


An installation guide for your toilet can be found here:

http://admin.totousa.com/Product%20Downloads/0GU013Z,%20ONE%20PIECE%20TOILETS,%20V.08.pdf

See the top of page 5 for guidance on setting the water level. Make sure you are turning the screw the correct direction (clock-wise) to reduce the fill level.

Is the refill tube properly connected? Should be connected to fill valve nipple and the other end clipped to direct flow to the inside of the overflow pipe.

Is water flow only through the overflow tube or is there leakage from the flush valve? Being only 3-months old you should not be having problems due to breakdown of rubber seals; however, check to make sure the toilet flapper is properly sealing against the flush valve.

If none of this helps with your problem you made need to replace the fill valve. On page 10 of your guide is a parts list; you can identify your part numbers and shop on-line for an idea of replacement costs:
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Did you replace the flush valve or the flapper?

There must either be a problem with the seal between the two surfaces of the flapper and flush valve or the flapper is being prevented by the flush system to returning to make a seal against the flush valve after the water completes draining during the flush cycle or more likely water is draining through the overflow tube.

Make sure the sealing surfaces are clean and not damaged.

Make sure the flapper is not being interfered with and is able to return to the closed position to make a complete seal against the flush valve.

Check adjustment of the water fill level to make sure the water is not filling above the water overflow. If the inlet valve does not shut-off when the level is adjusted to the proper level the water inlet valve may need replacing.

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