Patent ID: 7617690

Claim:
A freezer comprising a refrigeration unit, a controller electrically coupled to the refrigeration unit, the controller operable to (i) determine if the freezer is in defrost mode, (ii) count and log the number of times a freezer door is opened while the freezer is in defrost mode, (iii) write data to memory when a defrost mode has ended, and (iv) reset the number of door opened counts to zero after the data is written to memory, a temperature sensor electrically coupled to the controller, and a user interface device electrically coupled to the controller, the user interface device having (i) a display device operating in a first mode in which the display device includes a first portion operable to display an indicator when the freezer is in defrost mode, a second portion displaying the current temperature sensed by the temperature sensor, and a third portion displaying a graphical representation of historical temperatures compared to temperature limits, the display operating in a second mode in which the display device displays a log related to the operation of the freezer, and (ii) an input device operable to receive input from a user.