Answer Doug, You will need to test the voltage to the dishwasher while it is operating. If the line voltage drops by more than 10% or below 105 VAC the control will display the "PF" error code. If the Voltage remains above 105 volts, then there would most likely be a loose or damaged solder joint on the control board circuitry 5304514670 , causing the error code. Read More... Answered by AppliancePartsPros.com | Friday, September 11, 2015