In article ,
Harry Bloomfield writes:
Andrew Gabriel was thinking very hard :
Logic which detects water level dropping unexpectedly, or which
detects the machine taking too long to fill. No reset required
in this case - just restart the machine.

Which might be due to low water pressure.

Which is one reason why machines specify a minimum pressure
(another being that the electric water valves used in
them require a minimum pressure to reliably shut off).

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]