Thanks MeterMan. It’s not clear to me whether this is the same issue but it could possibly be. The users Olliesshop indicated a problem with two zones, and that the problem seemed to follow the zone when he changed the wiring. But it’s also unclear at this point how intermittent the issue is and how many zones might be affected in the future. I’ll have to keep an eye on that thread.
In my case I’m getting [false] no flow errors on almost all zones, but intermittently and always in a series of multiple alerts.