W2104 Check Drain. New pumps and still not fixed.

Some washing machines don’t energise the pump at all if there is no water detected. Leaving filter off would stop pressure switch activation so washer would think there’s no water inside.

Everything to check is in the link I put up and links within. Everything I could possibly think of is in those articles.

Nope. I've tried leaving the drain filter out and watching the pump. Doesn't even try to operate during the phases of operation where it should be spinning.... Water just pours out the drain filter location for me to catch in buckets.

Is there any logic to either the inlet valve possibly being involved (makes no sense to me), or some sort of moisture sensor at the base of the machine? (It's in a garage and we have a leaky roof, so the concrete floor has moisture each time we get a storm. It's a long shot, but this is driving me crazy).

I have an article about troubleshooting washing machine not pumping water out and there are several other related articles linked to in that page too.

The first thing to establish is whether the pump is running or not? When it is attempting to pump out the water - say on a spin only cycle - is the pump running?

It seems to throw the error / check drain light whilst still operating and I assume unsuccessfully attempting to pump the water out during the end of a particular wash/ rinse. So as best I can tell it's trying to pump out but detecting that water remains in the drain/ the pump isn't engaging. I could try a third spare pump that I have obtained, but it's highly unlikely that the original plus two replacements are all buggered.

That’s unusual. Does it cut out straight away after previously washing or rinsing or does it go quiet for a minute or so before cutting out?

Trying to work out if it is trying to pump out but failing and then stopping, which is what normally happens. Having said that if it times out on empty it should produce an error code unless it’s really really old.

Unfortunately it's not just an error, it stops full of water at the point where it attempts to pump out. My post may have been a little confusing in that I described several "cycles"... These are cycles of me manually removing ALL water through the drain filter point attempting to either clean the areas and/or check pump operation (or replace pump twice). Is the inlet valve or some form of moisture sensor underneath a possible cause of this? Otherwise, I'm assuming I may have a Circuit board issue.