Thanks to the APP team for helping me resolve this issue. As the H20 code is related to water, the lack there of, the presence of water in the pump when there should and shouldn't be, so I started with the water source and worked my way into the washer. There was debris in the screen on the water inlet assembly, so I cleaned it and that did appear to resolve the issue, as it ran 3/4 of a cleaning cycle. I could get the unit to purge the water from the unit, so I didn't suspect the pump assembly. After that failure I was certain it was a lack of water, so I replaced the Inlet assembly. The part came quick as always, but that didn't fix the issue.

I removed the unit and put it on my saw horses. I took plenty of pictures then removed things one by one and cleaned them. The drain pump was fine, but the pump motor cutting impellor had a ball of goo material on it and there was no way it was doing anything. This was part of the problem, but cleaning that up was not the solution. After blowing out all of the pump assembly passage ways I moved on to the water pressure assembly, which makes no sense for a name to me. It is not inline to any water sources where pressure would be monitored, but this was the culprit. The sensor is mounted vertically in a bracket that has shield. The bracket had more of that goo in it and the sensor itself, which has a tiny eyelet hole appeared to be full of the goo. It resembled melted plastic.

Our unit came with about a weeks supply of dishwasher pods, and it worked well, so we kept using them. I think the debris on the impellor and in the sensor was partially dissolved pods. We have a large family, so I make it a point to run the unit after everyone has taken a bath. Sometimes, that means there may be little to no hot water for the dishwasher. I think that contributed to the pods not dissolving and ending up in the sensor which is exposed in the pump assembly. This doesn't really explain why the H20 code was being thrown, but I suspect that there is no error condition programmed for the sensor partially functioning.

I ordered a new water pressure assembly and my fairly new dishwasher is working again like it should. I hope this helps someone.

Edited by user Friday, April 28, 2023 7:13:47 AM(UTC)  | Reason: Not specified