Product review (5 stars): I saved more money replacing the pump and not the whole assembly with a F4 Fault
After several google searches on why my washer was displaying the F4 fault it was determined that the washer pump was not operating correctly.  I cleaned the pump and reassembled but this was not a fix.  After thinking it through the pump needed to be replaced.  It did not appear to have rough edges on the impeller nor was the pump inoperable but the pump was not pumping sufficently enough to prevent the F4 fault.  I looked for a while to find a supplier that would sell only the pump and not the whole assembly and finally found this supplier on Amazon.  The pump was a perfect if not almost identical in every way to the OEM pump.  I installed it and it was back up and running in a few minutes.  If your wondering whether to replace the entire assembly or just the pump it was a clear savings to replace the pump only and it works great and was no more of a hassle than it would have been to just relpace the enitre assembly itself.