Dishwasher Electrolux ESL46500R ⇐ Electrolux

[Ivan Matskevich]

Hello, dear comrades.
The dishwasher does not plow.
It constantly tries to drain the water at the start of the washing cycle.
The pump (from a stray pipe) supplies water, I tried it by connecting the wires directly.
Everything rang, the board is intact, there are no smudges or any scorched places.
Error R20
When you turn on the wash, the water drain is triggered, and so on three times, after which it gives an error.
I poured in as much water as possible, everything was immediately sucked out, but the pump still works even when the dishwasher is empty.
I bought a new pressure switch.
I installed it and still everything is the same.
What could be wrong and how can I fix it?