What happens if I enter the wrong PIN code three times?
After entering the wrong PIN 3 times, the chronothermostat will remain locked for 20 seconds with the word Err displayed. The display will turn off after 5 seconds to reduce battery drain. This procedure repeats for any further attempt to enter the wrong PIN. If you forget your PIN, you can use code 618 to unlock the product.
From the official Finder IB1C91 Bliss Wifi Chrono Thermostat manual, page 14
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