3 of my 5-pack bathroom fan switches died when I tried to set this up this weekend.
Similar pattern as what you mentioned csd132 - it works until the first time you turn it off, then it never works again. Just a normal ‘contractor grade’ fan that was preinstalled when we bought the house year ago - nothing modern/quiet/fancy.
Home Assistant’s chart of the ‘overheat detected’ is always ‘false’ and the ‘internal temperature’ was always 27C for the entire time that the switch was installed. The ‘electric consumption [W]’ was 60 watts for the period that the fan ran.