Intake/Drain red light comes in and shuts down during wash cycle

I have had an ongoing problem with the intake/drain red light coming in and shutting down the cycle.I have checked the intake screen/filter and it is clean,I have also cleaned the discharge filter and dismantled the elbow check valve and used a garden hose to prove the discharge line clear.I have used draino on my own sink drain.When going through the Normal or economy or energy saver cycle it will drain the tub and then fill and go into wash cylce for about 3 minutes and then the intake/drain light comes in and it shuts down.Previously, I had the light come in and shutdown halfway through the wash and it was determined that the heater was having problems and I solved that by turning the dishwasher switch off and the dial to stop and it worked for the past year, now I have this problem. Is there anyway to reset the computer brain?? Any ideas would be appreciated.