Product review (4 stars): Haha it came quickly and worked fine, but my F/H error was caused by my ...
Haha it came quickly and worked fine, but my F/H error was caused by my not opening the valves far enough at the hookups. After many years the deposits built up and nearly completely closed the narrow path. After replacing the flow meter and running the diagnostics I still got the F/H, then I checked the valves and opened them fully. Silly me.