Kohler whirpool tub will not turn on

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.

you have been hit by power surge. most likely the problem is in the control box that controls the pump. Need to call local plumber or service company to take a look at the system.
Verify that all circuit breakers are on and stay on after being reset before calling service tech.

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You could have a restriction in the tub spout or just too much pressure. Diverter only restricts flow to tub spout so any restrictions to the tub spout will cause water to go up to shower head.

Sounds like the cause of your problem is the pressure balancing spool. Call Moen at
1-800-289-6636 and explain the problem. They will send a repair part to you free of charge. the link below is a "blow up" of your valve.

http://www.moen.com/shared/pdf/t3113pt.pdf

If the faucet was working before and then just stopped, it is the mixing valve or a clogged supply line.
turn the water off and remove the mixing valve. Turn the water on and see if you have good flow from both hot and cold ports inside the faucet.
Caution- this procedure can get messy, close the shower curtain or door.
Call Kohler and ask for a new mixing valve for free.

There is a float valve interior of the steam generator that supplies water to the generator unit. There are no parts available for that unit, and Kohler was useless re: repair. I have the same unit and mine is doing the same thing. I took it apart and there is a washer worth about a nickel that is inside the unit. I flipped the washer over in mine and it worked for about a week....then back to the same problem.

Sounds like it was installed upside down or the cartridge is installed improperly

Since I don't have your model number for this, I am going to attempt an answer for you. Yes, there could be a filter but not always. Sometimes, the sensor on these units can become stuck closed and is sending a false error. Does the unit seem to be working? If it is, then it probably is a false signal. If not, the there could be debris that has gotten into the water lines. Either way, if the unit is new, then it will be under some sort of warranty. I would contact either Kohler or an authorized service rep.

The device which directs the water up or down is called the diverter. Your diverter is not fully up or fully down. Rather forcefully push and pull the diverter a few times and your problem may be solved. good luck.

As a helpful hint , on these models, When installed some plumbers or home owners use plumbers putty to seal the threads and in some cases tape.
Most of the time the putty or tape gets pushed through the system if too much was used.
Check by removing the shower head and testing the pressure and blowing anything else through, then checking the head itself for foreign objects.
Kohler has a cleaning and care page on thier web site if it needs cleaned.