I have a whirlpool duet sport washer model number WFW8300SW04. It keeps stopping during drain cycle with a code F33. It is probably 10 years old. Drive belt was replaced about 3years ago and pump was replaced last year. sometimes it is when it is on a high spin speed of a medium spin speed. Would the circuit board be bad?

That error is normally caused by a failing or failed drain pump. I recommend replacing the drain pump again and see if the error stops. If not that means the pump circuit on the main board has failed and the board will have to be replaced. Just make sure to check the wiring from the main board to the drain pump and make sure connections are seated properly and that the wiring is not visibly damaged. If you want to fix it in one go just replace both the pump and board at the same time. The parts are linked below for that model.

Order Drain Pump

Order Main Board - AKA CCC or Central Control Unit