How do I unlock the thermostat if I forget my PIN?
If you forget your PIN, use code 618 to unlock the product. Note that removing the batteries will not cancel the lock. After entering the wrong PIN 3 times, the thermostat will remain locked for 20 seconds with the word Err displayed. (Page 14)
From the official Finder IB1C91 Bliss Wifi Chrono Thermostat manual, page 14
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