What should I do if I see the BAT warning on my thermostat display?
The BAT warning indicates that your batteries are low and must be replaced. When the display is off, the word BAT will flash every 60 seconds. You should replace the batteries promptly to maintain proper thermostat operation. If the chronothermostat is not connected to Wi-Fi, you will need to reset the date and time after replacing the batteries.
From the official Finder IB1C91 Bliss Wifi Chrono Thermostat manual, page 7
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