I have a kenmore elite dishwasher bought in 2006. I have used the normal wash,heated dry buttons to reset the blinking light several times. The problem persists every 3-4 washing cycles. What can I do for a permanent fix for this problem?

More than likely you have something sticking, like the float level switch or something like that. Make sure to check your filter and take the spray arms off and see if they have trash in them, then check the pump clean-out. Here are some manuals: https://dl.dropboxusercontent.com/u/8010163/Kenmore_Ultrawash_Dishwasher.pdf
https://dl.dropboxusercontent.com/u/8010163/How%20to%20use%20Test%20Equipment%20Service%20Manu al.pdf
Another problem that is very common with that dishwasher is that the control panel where the buttons are located gets dirty from moisture getting into it. To repair it you have to remove the panel and peel off the rubber front and clean both surfaces with dishwashing soap and water with an old soft toothbrush. Then wash off with water and then alcohol (95% isopropyl) and let dry in sun or a warm, dry place. Check for corroded or loose connections which also may be causing your problem. You can find these all over the machine, but more than likely around sensors and safeties.