I had an American Standard Cadet3 Right Height Elongated toilet installed. After flushing, water level in the bowl drops to a very low level. Enough remains to prevent gasses or orders, but just enough. I have tried all adjustments I can think of and nothing works. I had an experienced installer and he is stumped. I had two others installed with no problem Do I have a defective toilet or is there a fix I'm missing?

Turn knob on top of float ball to increase ball height which will increase water column. Up to 1" of overflow tube.

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 valve

b) 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.

As long as the water in the bowl dosent go below the bottom rim your ok there is a trap that the water has to seal that all it needs look at the side of your toilet you will see the trap water saver

For now, just hold the handle down until everything goes down, common problem with low water use toilets, You may want to take this unit back and get another one.

The amount of water in any toilet bowl is determined by its construction and no tank adjustment will ever change that. American Standard has a history of having small water surface areas in their low or ultra low flush toilets. Take a large container of water and pour directly into the bowl. If the ending level remains the same, then that is the manufactured level for your toilet.

Not all tanks completely discharge all of the water when flushed. Measure 1.5 gallons of water into a container. Turn off your water supply to the toilet then flush normally. Replace the water in the tank with your premeasured amount and observe this new water level. You might be surprised to find it is at the same level it always is. Since water weighs more than 8 pounds per gallon, one concept used in todays toilets is to have more than 1.5 gallons of water in the tank and use the extra weight push the water past the flapper at a faster rate while designing the flapper to drop after only 1.5 gallons have passed through.

No there isn't. It is set by the design of the bowl and the depth of the p-trap inside the toilet

Sounds like your flapper isn't sitting properly. Put food coloring in the tank and wait a bit - see if it goes into the bowl for a definite answer. A new flapper will cost about 6 bucks. Good luck.

You have a blockage in your drainage system.

I have the American Standard Champion 4 toilet. Water is leaking from the tank to the bowl causing the toilet to refill. I've replaced the flapper and cleaned the surface the flapper contact. Nothing seems to work.