Whirlpool Pump - Hums, no water flow...

no reset on motor ( that would not cause breaker to trip, suspect heating element, or motor is bad.

Sounds like the pump impeller is stuck. Shut off the power and check to see if the pump has a small round cover on the end opposite from the pump. Some pump motors have a slotted shaft that you can insert a screw driver and manually turn back and forth to loosen the stuck impeller otherwise drain the tub and remove the pump to access the impeller and attempt to free it.
Hope this helps.
Bob

First of all, what you have is a WOW pump that has an E-switch for a control.
There is a knob on the top lip of your tub that you turn a 1/4 turn to turn this pump on/off.
There is a small circuit board inside the box on top of the motor. This is likely the source of your problem.
Here is your biggest problem. That little circuit board is not made anymore. We have the e-switch but you will be better off changing out the pump (which you have to do anyway) with a new WOW pump with an air switch and change the switch on the top lip of the tub to an air button which will turn the pump on/off.

Rod
US Parts Center

If your bath pump LD7A-C will not shut off when you push the air button then the AIR SWITCH in the motor needs to be replaced.
This is a pretty common problem with Bath Pumps and easily fixed.


Rod
US Parts Center
888-521-6183

Is the pump running or just humming? If it is running and you do not have water flow then you may have an air lock in your system.The way to solve the air lock is to fill the tub with water and turn on the pump. Once you have done that then loosen the pump union on the top of the pump (discharge) until you get some water coming out. If that was the problem then the jets will start churning out water

If this is a new unit you need to complain to whoever you bought it from. somehow it doesnt surprise me with the kohler name on it. I used to work for a company that sold mostly kohler stuff.

look on the back of the motor there should be a shaft that you can try to turn to spin free because something inside the pump is blocking it. rate me if this is helpful.

probably already solved this but yes, you can put a heater on any bathtub that has water jets.

Sounds like the pump or pump filter is blocked, you need to check for a blockage.

if you can hear a low humming noise when it should be pumping water round, then suspect the circulating pump.
fault can be motor capacitor - low cost part
or
pump seized - see if you can turn it by hand