I have a Frigidaire Gallery Professional Series Dishwasher that won't complete its cycle anymore. The cycle will start normally but at some point, usually soon, it quits and displays PF (for power failure) in the display window. My wife recently got it to run full cycle on the lower rack setting but now that has started doing the same thing. Any help with this problem would be appreciated. We live in a rural area where appliance repairs are at a premium.