If it is the lower display with the 2 green digits, then that is referring to hours of service since last brush clean cycle. It is just a timer. Once it reaches 99, it start to use letters and numbers, so A1 would be 101 hours since last brush clean. b1 would be 111 hours and so on. To clear this the machine must recognize a brush clean cycle. the next time you clean your freezer door, make sure the power switch is off. it will display a 5 minute timer and 4 temperature readings. All 4 of those temperature readings must be above 60 degrees Fahrenheit and remain above 60 for 5 minutes. If at any point the temps drop below 60, the timer will reset. The freezer door must remain off the machine during this time. Once the timer reaches 0, the machine will enter a Unit Cleaned state and you can reassemble the machine.
Answers & Comments
If it is the lower display with the 2 green digits, then that is referring to hours of service since last brush clean cycle. It is just a timer. Once it reaches 99, it start to use letters and numbers, so A1 would be 101 hours since last brush clean. b1 would be 111 hours and so on. To clear this the machine must recognize a brush clean cycle. the next time you clean your freezer door, make sure the power switch is off. it will display a 5 minute timer and 4 temperature readings. All 4 of those temperature readings must be above 60 degrees Fahrenheit and remain above 60 for 5 minutes. If at any point the temps drop below 60, the timer will reset. The freezer door must remain off the machine during this time. Once the timer reaches 0, the machine will enter a Unit Cleaned state and you can reassemble the machine.