The drain pipe may be partially clogged with lint. The old washer pump may have been a little weaker and didn't fill the pipe so fast.
Maybe someone can use an awger on the drain ptpe ...have to clean down to the J trap at the floor.
Hope this helps
First, make sure that both hot and cold water valves are turned on.
The F20 error code is indicating that the water level switch is not detecting a change in the water level while filling. You mentioned that you raised the drain hose so that it's only 3-4 down inside the drain pipe. If the stand pipe is too low it still could siphon out. Watch the end of the drain hose while it's filling with water to see if water is gravity draining out while it is filling.
If the washer is filling with water and you see no water draining out the hose while it's filling most likely it would be a stuck water level pressure switch or the water flow meter.
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