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Thread: Toto Ultimate bowl level low after replacing fill valve

  1. #1

    Default Toto Ultimate bowl level low after replacing fill valve

    I used a Korky universal fill valve replacment in my Toto Ultimate toilet. The replacment fixed my original problem, which was that the valve sputtered and shut on and off while filling the tank. However, the water level in the bowl is too low now after flushing. If I hold down the handle, the bowl fills to the normal level. The water fill hose is clipped to the overflow tube and I can see that water is flowing steadily into the tube while the tank if filling. But it seems like the water flowing from beneath the fill valve cap fills the tank before enough water flows into the bowl through the overflow tube. The fill hose is not kinked and water flows through it freely, so I don't think it is obstructed. Could this be because I used the universal Korky fill valve instead of the one made specifically for Toto toilets?

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Where is the water level in the tank once the fill stops? If it isn't within about 1/2" of the overflow, then you need to adjust the tower to raise the tank volume.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3

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    The water in the tank fills to the correct level.

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default water level

    If the fill valve refills the tank too quickly, it will not flow enough water through the refill tube to also refill the bow. The only remedies are to get a slower fill valve with full volume to the refill tube, or try shutting the water supply to yours so the tank fills slower, but the refill tube still delivers a full stream.

  5. #5

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    Switch to a fluidmaster fill valve. They're definitely not too fast.

  6. #6

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    If the fill valve refills the tank too quickly, it will not flow enough water through the refill tube to also refill the bow. The only remedies are to get a slower fill valve with full volume to the refill tube, or try shutting the water supply to yours so the tank fills slower, but the refill tube still delivers a full stream.


    Thanks for the suggestions. I will try partially shutting the water supply to see if that helps. If that fails, my plan is put the old fill valve back but replace the cap assembly with the one from the new valve. If that fails, I'm going to order a 528T fill valve. Beyond that, I'm out of ideas.

    Regarding the vaIve filling the tank too quickly, I am wondering if that is what Korky means by "Higher refill ratio for optimum performance in TOTO toilets" in the description of the 528T fill valve (I used the 528). As pointed out in other threads, Terry has reported success using the 528 in Toto toilets, but the question of what the difference is between the 528 and 528T seems to remain unanswered.

  7. #7
    Forum Admin, Expert Plumber Terry's Avatar
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    The easiest fix is always to just replace the $1.99 assembly cap.
    It takes less than a minute, and costs the lest.

    http://www.terrylove.com/korky/
    Last edited by Terry; 11-01-2008 at 03:43 PM.

  8. #8

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    Terry,

    Thanks for your reply.

    The easiest fix is always to just replace the $1.99 assembly cap.
    It takes less than a minute, and costs the lest.

    Granted I should have done that to begin with, but keep in mind that I just replaced the whole valve, so I now have a brand new assembly cap in my toilet. So assuming that the brand new cap is not somehow defective, my question is whether the valve I installed (Korky QuietFill Fill Valve p/n: 528) is incompatible with my Toto Ultimate and causing the water level in the bowl to be too low after flushing?

    Ned

  9. #9
    Retired Defense Industry Engineer jadnashua's Avatar
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    You sure that the hose to the overflow is not kinked or something? Remember, it has a small section under the cap. If the flow out of that hose is strong, it doesn't make much sense.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  10. #10

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    You sure that the hose to the overflow is not kinked or something? Remember, it has a small section under the cap. If the flow out of that hose is strong, it doesn't make much sense.

    Yeah, I'm pretty certain that's its not a problem with the fill hose.

  11. #11
    DIY Senior Member achutch's Avatar
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    I also installed the Korky Quiet Fill in one of my toilets in my camp last year. The water is gravity fed and filtered, with about 15 lbs. pressure at the faucets, and the screen inside the Quiet Fill is clean.

    I noticed that the water coming in through the refill tube is very slow as compared to a Fluidmaster 400A or the Mansfield 09 in the shed bathroom. Near the end of the fill, the water coming out of the refill tube increases by quite a bit, to the point where I can hear the water trickling down the jet passage in back of the bowl. It seems to happen just as the water is lifting the float that's hidden under the cap.

    It is not causing an issue because the bowl fills to its correct level (it's a big tank). But, is this normal for this type of valve? If this was a 1.6 tank, I would probably having the same issue as Ned is reporting.

    I notice no difference in the flow in my Toto at home which is on municipal water and has the same valve (with the G-Max cover).

    achutch

  12. #12

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    I had the exact same problem as ned after replacing the fill valve in my ultramax w/ the korky 528. The bowl wouldn't fill all the way (was dependent on how long I held the flush lever down). The water level in the tank was exactly at the mark. I replaced the entire fill valve assembly including the black tube that fills the bowl. That didn't work. I then replaced the assembly cap w/ a new one from my Toto dealer. Still the same problem. Finally I replaced the entire fill valve with the korky 528T ("for Toto"). The flow rate through the little black tube into the bowl is much higher than on the 528. The water level in the bowl fills to the correct level regardless of how short/long I hold the flush lever down. So you need to use the Korky 528T, not the Korky 528.
    Last edited by JimC; 12-13-2007 at 08:13 AM.

  13. #13
    Customer Service Manager Plumbing Wholesale Peanut9199's Avatar
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    Quote Originally Posted by JimC View Post
    So you need to use the Korky 528T, not the Korky 528.
    That's good to know, Thanks

    We have Lowe's just coming into our market. Before that we had no big box store handling the Korky fill valve.

    I was going to tell end users to go there so it's good to know there is diferent kinds.

  14. #14

    Talking Toto Aquia will not fill at all

    I just replaced the sink in my bathroom along with both hot and cold water supply valves. To remove those valves, I had to shut off the water to my house. After removing them, I noticed that there was corrosion in both nipples, surprise surprise (the house has galvanized plumbing installed in the 1920's)! Got the sink working, but then, to my surprise, the tank on our Toto Aquia totally stopped filling after the next flush, and I mean not even a drop. Since I had just replaced two leaky valves in the wall, I went ahead and replaced the valve that fills the toilet as well. I cleaned out the corrosion, reapplied silicon tape, reattached the flexible supply hose and opened the valve. Still, nothing. I heard water entering the hose but it never made it into the tank.

    According to my plumber, I am faced with the lovely Christmas eve chore of removing the tank from the Aquia just so that I can check the other end of the hose that feeds into the fill valve inside the tank. I am not looking forward to this, because Toto offers no instructions at all on how to service this model, not even to plumbers, and of course, they are closed for the holidays.

    I imagine that this is not going to be as simple as using a screwdriver to remove both screws on the inside bottom of the tank. There are probably those nasty plastic nuts cemented on the bottom of the tank, which is of course virtually impossible to access without first changing into an elf. Anyway, my concern is that once I have the tank off, and I check the hose, if it is clear, I will not know what to do next. Is there anything about this toilet's fill valve that can be adjusted without removing everything? The fill valves of most toilets can be adjusted with a simple turn of a screw to modify the angle of the arm that attaches to the floater, but not the Aquia! Anyone have any suggestions before I remove the tank, knowing full well that I am going to have to put it back and risk creating leaks where none were before? If any one has a better diagnosis, second opinion or simpler solution, it would make a better Christmas gift than anything Santa could offer (other than a real live plumber who has got one of these in his own place...many experienced plumbers have no idea what they are getting into when confronted with the Toto Aquia and its lack of complete and accurate instructions).
    Sure you all have better things to do than read toilet forums on Christmas eve, but in all honesty, Christmas probably gives the Superbowl halftime a run for its money on the national flush meter.
    Joyeux NoŽl!
    - Jonezen (for a bucket-less flush)

    Fill valve instructions for the Aquia fill valve
    Last edited by Terry; 12-25-2007 at 12:29 AM.

  15. #15
    DIY Senior Member SteveW's Avatar
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    Not unusual to have flakes of corrosion or hard water deposits come loose when the water is shut off.

    I don't see any apparent need to take the tank off the toilet - as you say, this just increases the risk of leaks and isn't really necessary.

    I would disconnect the flexible supply line where it attaches to the fill valve at the bottom of the tank, then turn on the water to see if anything comes out (have a bucket handy!). If water comes out at a brisk pace, then the problem is the fill valve is plugged up. It may be possible to clean it out, but I don't know that model so can't say for sure. Would be best to replace it if it is plugged up.

    On the other hand, if no or very little water comes out of the end of the supply line with the valve on the wall open, then obviously you have either a plugged flexible supply line or the supply valve itself is plugged up.

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