Sorry for problem with new toilet.
You say water is leaking out of the bowl?
Toilets have 2 parts:
1) Tank: where water is stored for the flush and is sealed with a flapper.
2) Bowl: where water flushes down.
a) If tank is leaking water, then flapper is suspect. Replace flapper and see if that works.
Lift up flapper and run finger around rim to see if there is a rough spot that would indicate flush valve is defective, and needs replacement.
See typical flush valveb) If bowl is leaking, that is very unusual and would indicate a crack in the porcelain.
If installer sold you the toilet, it is his responsibility to make good on product.
All products are guarantee against workmanship flaws.
Well, the float assembly in the Happy D is a little different from what I normally see in US made models. I expect that when the float rises, the valve should shut off. But it seems that the hissing sound continues after the float had risen, thus the valve was still open, and water still flowed over the overflow pipe, until a while later. This seem to cause the water in the bowl to accumulate and drain several time until the water valve shuts off. I don't have a diagram of the float assembly, so I don't know how to diagnose the problem.
to really know whats going on, remove tank lid and observe what is going on in there when you flush
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