I came across a number of posts on the "old" version of this site while Googling my hissing American Standard toilet. Since you cannot post to those threads anymore, I am posting this message as an update to future readers with the same problem.
I did a screen-cleaning procedure the other day per the maintenance instructions, and ever since, the toilet keeps hissing. That internal rubber seal with the thin little flap on it is SO temper-MENTAL. No amount of tweaking the cap and seals seems to fix the problem.
Anyhow, if you call American Standard, they will ship you a new Smart Valve free of charge, no questions asked. Evidentally this is an ongoing headache for them, so if you want to defer replacing the valve with a FluidMaster, you can get a free one that should work (for a while). Both the US and Canadian support people were willing to do this (I am in Canada).
I did a screen-cleaning procedure the other day per the maintenance instructions, and ever since, the toilet keeps hissing. That internal rubber seal with the thin little flap on it is SO temper-MENTAL. No amount of tweaking the cap and seals seems to fix the problem.
Anyhow, if you call American Standard, they will ship you a new Smart Valve free of charge, no questions asked. Evidentally this is an ongoing headache for them, so if you want to defer replacing the valve with a FluidMaster, you can get a free one that should work (for a while). Both the US and Canadian support people were willing to do this (I am in Canada).
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