repair pcb edw503 electrolux

Model 911939224-01

TT50e

When I power on my dishwasher, water is never loaded and drain pump starts immediately and never stop itself even if empty state occurs.

There is no anti-flooding system although service manual shows it but paper lists several models.

I checked directly the two pressure switch (both level and overflow) blowing in tubes, tester showed zero resistance and immediately after blow infinite resistance.

I wanted to check wiring for only level pressure switch disconnecting it from pcb, I used tester to check signal to connector with both water and no water. This worked fine.

I checked door switch was closed.

I think problem is in PCB, I call technician and He confirmed it

Then I try to desolder only the gate pin on acs108-6s (overvoltage protected AC switch, which is the triac which drives drain pump) and when I power on dishwasher, pump doesn't start.

I think if problem was about drain pump driver circuit, dishwasher should have to load water and this one never occurred.

What can you suggest me now please?

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