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Ando That brings hot water from the steam boiler into the brew boiler when the hot water tap is open. Also used to pressurise the brew boiler when using “steam pre-infusion”.
Can you confirm this? “With the machine open, steam boiler on and at full pressure… If it’s a hole, them steam will be escaping from it. ”
Ando Then once up to temp it was ok.
the hole will not magically close itself up when the machine is up to temp….