I can't see any reason why the fan thermostat/relay should be anything but NO (normally open) at room temperature. (And I can find online discussion to that effect)
My best guess is that (if it is a *blue* dot replacement) you've got a duff one. Of course we might be mixing up the red and blue, but I've already pointed at a website that says otherwise).
Frankly, I'd be asking Zanussi if it should be NC or NO at room temperature.
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