Without a full model number, I cannot determine the type of control that you have on your Kenmore Ultra Wash dishwasher beginning with model number 665. . .
There are many different Ultra Wash models that begin with this model number. On some of these models, you could have a control lock that would cause the normal light to blink if you are trying to program the wash cycle. Check to see if the control lock light is lit. The console will normally indicate how to disable the control lock. It is normally accomplished by pressing and holding the button next to the lock icon for 4 deliberate seconds or until the lock icon light turns off.
Make sure that the dishwasher door is firmly closed. The normal wash light may blink on several models if the door is not closed.
A stuck button on the control board will cause the normal wash light to blink and will disable the control until the situation is corrected. If the light is flashing quickly and the console will not respond to any key presses, then it is likely that the console is bad and will need to be replaced. I recommend calling a service technician to diagnose and repair this type of failure.
If you need more help, resubmit your question with additional details and the full model number of your Kenmore Ultra Wash dishwasher.