This is the process I used to resole the HF error code.
1- Removed pressure switch from washer.
2- Disassembled pressure switch., made sure all parts were in place and functional.
3- Reassembled pressure switch.
4- Tested pressure by blowing into the tube. You should hear clicking, this is the diaphragm responding to pressure you are applying by blowing into tube.
5- Checked for continuity on the pressure switch, when triggering the diaphragm of the pressure switch. Used a volt/ohm meter.
6- Removed flow meter, made sure there was not obstruction by blowing through the flow meter. I also used a magnet to trigger the wheel inside. Repeated for both directions.
7- Cleaned out the filter of the water pump.
8- Cleaned out inlet valves.
9- Installed back flow meter and pressure switch.
I got rid of the HF error code. I believe it was flow meter, something may have caused the internal wheel to work improperly.