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so you connect the leak sensor and then you enable the leak function and the alarm goes on?

maybe better post some screen shots of the settings

I don't know what you mean exactly with "same thing".

The question is: is the shown level sensor state responding?
Means: watch the state in GCC and "simulate" water contact, e.g. touch the...

yes, and this is the correct behaviour

no sensor connected is equal to sensor present with water detected

-> connect sensor and you will see no alarm unless water is detected