Fisher paykel GWL10 doesn't drain Previous problem

Fisher paykel GWL10 doesn't drain Previous problem may be connected: When washer was filling with water it was screeching. Taking off the washer hoses turned up that the cold water screen had been pushes aside and sand-like particles were on the inlet valve entry; I cleaned off and the screeching became intermittent, more frequently on regular load, but didn't totally disappear. I noticed a grinding noise when moving the tub like it was rubbing on sand when I moved it back and forth, there was dirt (sand?) on the tub ring. I figured the sand would wash out over time. After 2 previous washes completed OK, the last wash stopped at rinse cycle and didn't drain. Moved up to spin and still didn't drain. Shut off machine, restarted at rinse, walked away and when I came back machine had shut off still full of water. I restarted at rinse and noticed a low humming as if it was trying to drain but couldn't. I shut it off. The diagnostic mode instructions confused me - one said that only the LOW on the water level should show after pressing/holding Temp button (down or up), the other that only HOLD on spin should show before using spin (up or down) to have hold and slow show on the spin to get the diagnostic code. Initially I got LEDs left to right: 0 1 1 1 1 1 0 1 (1= LED, 0= no light) and the last (spin) LED was blinking RED. I couldn't find a code in the listing that I have. I then presses/held Temp up & power and got the hold only LED on the spin speed and the with the buttons until I got the HOLD. The default code now is 0 0 0 0 1 0 0 1 with spin RED but not blinking. According to diagnostic this is a machine size error. I reset the size, as instructed, with hold/press TEMP up & Power to get to HOLD on spin, then pressed Power. Yet, I still get the same diagnostic code indicating size error. I unplugged machine and reset twice but get same code. Is there another way to reset the machine size so I can get the diagnostic code that I need about the not draining problem? I think the problem is the pump because the "hum" seems like the cycle tells to drain but it can't. What is the best way to check if the problem is a clogged pump (because of the previous sand issue)? I replaced the diverter 4 years ago when I had a similar "no drain" problem. Could it be that the diverter is defective again? The original diverter worked for 9 years. thanks for any suggestions.