Sub-Zero UC-24 series Service Manual page 25

Electronic Control System
Under Counter (UC-24) Series
Initiate Temperature Log Recall Mode To View Compartment and Evaporator Temperature History: To view
compartment and/or evaporator temperature history, begin with the unit ON and in Diagnostic Mode (See Figure 3-
47). While in Diagnostic Mode, toggle through the readings until the desired thermistor temperature is displayed on
the LCD (See Figure 3-48). Now, press and hold the POWER key first, then the WARMER key, then release both
keys (See Figure 3-49). The left display area on the LCD will show average temperature and in the right display area
will be the index number "1" indicating the most recent two-hour temperature average. The right display area will
also flash the thermistor location code at 3 second intervals (See Figure 3-50).
Figure 3-47. Initiate Diagnostic Mode - Press and Hold Either COLDER Key, then the POWER Key
Figure 3-48. Toggle Through Readings - Press COLDER or WARMER Key Until Desired Thermistor
Temperature is Displayed
Figure 3-49. Initiate Temperature Log Recall Mode To View Temperature History -
Press and Hold POWER key first, then WARMER Key
Figure 3-50. Thermistor Location Code Flashes Every 3 Seconds
To toggle up (increment) through the indexes (from 1 to 168), press the same WARMER key in multiple key strokes
(See Figure 3-51). To toggle down (decrement) through the indexes (from 168 to 1), press the corresponding
COLDER key in multiple key strokes (See Figure 3-52).
Figure 3-51. Toggle Up Through Indexes - Press WARMER Key in Consecutive Key Strokes
Figure 3-52. Toggle Down Through Indexes - Press COLDER Key in Consecutive Key Strokes
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#7003933 - Revision B - November, 2007