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.