The tub has not had any problems draining. Drained immediately after morning shower, would not drain after son's noon shower. Used a little hand snake and pulled out a little hair, still took about 1 hour to drain 3 inches of water. What should I do?

Overflow? Seal around drain may be good enough for shower, but leaks with a little more pressure from the filled tub. Filled tub may flex the tub and drain components. What about the overflow. I bet some water is going over, but it isn't used for showers. Double check. Paper towels tied in stratigic locations always help me find a leak. Leak makes the towel soak up water nearby. It's most wet at the point of leak.

If it only leaks when filled to a high level, the rubber washer behing the overflow plate is misaligned or missing. this plate is on the tub wall above the drain, and hld in in by 1 or 2 screws.

I had a similar problem when my dishwasher wouldn't drain and was causing the kitchen sink to back up. I poured a little drain cleaner in the bottom of the tub (where the drain holes are) and let it stand for about 15 minutes then ran a hot rinse cycle (don't put any dishes in the dishwasher while you're doing any of this). The water still hadn't all drained but after a day or two of not using the dishwasher it drained on it's own and hasn't had any problems since. I would recommend reading your manual to make sure that using drain cleaner doesn't void any warranty you may have. Also, it's a good idea to do an empty rinse cycle at least once so that there's no chemicals getting on your dishes.

I had the same problem. I discovered that an O ring was missing (or I lost it without noticing) from a new diverter that I installed. Just got an O ring that fits on the threaded part of the collar where it meets the pipe. Worked fine. Amazing how a little plastic piece could make such a difference.

Hi it may well do clogged up in drain hole or it may have come loose inside try tighenting up

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You say that it doesn't leak during showers. The next step is to plug the drain 100% so no water will drain thru the drain assembly. Fill the unit up to just below the overflow drain and leave overnight to see if it could be leaking from the outside of the drain plug assembly or leaking from the jets/drain from the whirlpool feature. If was just recently installed was it professionally installed. Should be covered by warranty.Try this then if its not determined what the cause we will go to the next level of investigating what it could be.in it peak all around to see where the water is comming from. Use a flashlite so your not kneeling in mosture with a electrical light in your hand!!! Good Luck!

you may have burnt the pumps up,pumps like that are water cooled they may have over heated ,you may need to replace the pump.

I take it that you removed the drain trip linkage and stopper through the vent hole .
You must now run a small hand or small power snake the less than eight feet to open the drain.
You can also plug up the vent,tightly and  try a flat plunger on the tub drain .  

there is plastic plug that is used to stop the drain, when you pull the handle.
seems like the chain is broken off the the drain plug. the drain plug is one way plug.
the only suggestion I have is to open the backwall or the ceiling to get to the drain pipe. then you have to open the drain in order to fix this problem.
there is no easy fix, since you can't get to the plug that is in the drain, and the more you pull, the tighter it gets.
I don't suggest try to push the plug down, it may clogged the drain somewhere else.