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F/H means no water detected entering the machine or pressure switch trip not detected, if after 30 seconds the control does not detect water entering the machine the valves will be turned off and the error code will be displayed.
If the control has turned the water valves on and after 8 min. the flow meter has detected 10.5 gallons of water passing through it but is not detected the pressure switch trip the valves will be turned off and the error code will flash.
Press pause/cancel twice to clear the display. The most common reason for your failure code is your pump trap is clogged, on these machines they have a pump trap on the pump itself if these get clogged the water doesn't drain correctly which will not trip the pressure switch, what you need to do is clean the pump trap first before anything else. I am including a video to show you how to get to the pump trap, the video is actually how to replace the pump but it will show you how to get to it the trap itself you unscrew, here's the video, http://www.repairclinic.com/PartDetail/Drain-Pump/280187/1200164#repairHelpVideoTabs clean the trap and replace it and try the machine again, caution there will be water so have some towels ready stop up the water unscrew the cap slow to let the water, before removing the trap, let me know how that works, thanks, Bryan