My brew day this past weekend went pretty smoothly.
But then I had an odd issue during clean-up. When I went to rinse and clean out the brewzilla, the pump would not start. I could hear it running but no liquid was getting pushed through.
It worked just fine during the brewing, and so I was starting to think through what could have happened in the interim. But then when the water level inside the brewzilla raised enough to touch the end of the recirculation tube, the water started pumping through as normal.
I'm guessing the extra bit of suction on the end of tube overcame whatever the problem was. Or maybe there simply needs to be a minimal level of water to provide enough downward pressure.
I have definitely used the the pump/recirc tube previously while cleaning without the water level reaching the bottom end of the recirc tube, and did not have this problem. So I'm still wondering what that initial problem was, but hopefully it is now resolved.