Question about Toto Toilets ST784S 12 Sedona Beige Clayton Toilet with Traditional SoftClo

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Flush Toto less than year old. Following flush (which is not quiet), remains ru nning for extended period of time. Then, on many occasions, following running, toilet makes a "hissing" sound then it physically "vibrates/shakes" for a few seconds. (The ice maker also rattles during this process). I am afraid it may be jarring the bolts loose, or doing perminent damage.

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It sounds to me as though its the ballvalve not shutting off properly & when it does shut off the noise you hear is a water hammer, and my guessing is you have a water meter with a back flow prevention valve fitted so when the ballvalve shuts off the pressure exerted on the valve cant go anywhere due to the back flow unit so the noise is the water reverberating through loose pipe-work, annoying but not damaging

Posted on Dec 15, 2008

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