When we changed out the power cord it shows pf on the screen.

@dixiep let us know why you needed to change the power cord. Anyhow, PF is a Power Failure error meaning electricity has been interrupted to the machine. Any electrical interruption such as a circuit breaker being reset or power outages can cause this code. To reset it try to;

Press the Pause/Cancel/Stop button twice to clear the PF in the display.

Try to start a short cycle to check the operation of the machine by selecting a cycle and pressing and holding the start button.

There is a possibility of a failed control board if the PF error remains