Bosch Classix slimline dishwasher not draining

[Sambadog]

My dishwasher is puddling in the base after each cycle. Not flooding the floor as yet, but pudding in the bottom. I have checked the impeller and it moves freely. There was a Lego piece and fragments if perished filter edging, but all successfully removed it would seem.

Model is Bosch Classix slimline SD13H1B.
https://photos.app.goo.gl/a1sHBgsVHXhcq9uM8
IT washes ok, but when the cycle is finished there is 2 or 3 inches of water in the base. I have had the waste pipe off where it joins the sink but can’t tell if it is ok. It must be draining to some degree or it would be leaking right?

I have not been able to find a repair person in Renfrewshire, which is shocking in these times of climate emergency.

What could it be? Impeller stuck (no), waste pipe blocked? (unsure), pump malfunction? (I’m not flooded…)
I’m determined not to buy a new one on general principle. What should I try next?

[electrofix]

have you checked the pump cover is correctly fitted

check how well it drains into a bucket

check the sink drain for blockages

dave

[Author]

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