What WiFi network requirements does the IB1C91 have?
The chronothermostat operates on 2.4 GHz WiFi frequency and requires WPA2/PSK encryption. The network must not be 5 GHz only; 2.4 GHz networks or dual-frequency networks are accepted. BLISS does not work on corporate (enterprise) networks, and the router must support WPA2 encryption.
From the official Finder IB1C91 Bliss Wifi Chrono Thermostat manual, page 18
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