Service Guide
40
C. Defrost
To initiate a manual defrost, press the manual defrost button briey. The defrost icon and
"dEF" appear in the display.
1. Refrigerators
Refrigerators use a time-initiated, off-cycle defrost and defrost once every 2 hours.
As soon as power is turned on the 2-hr. defrost timer starts. Once the 2-hr. defrost
timer terminates, defrost begins. When the defrost thermistor warms to 44°F (6.6°C),
defrost terminates. The minimum defrost time is 20 minutes and the maximum defrost
time is 1 hour. Cabinet temperature is displayed during defrost.
2. Freezers
Freezers use a cumulative compressor run time-initiated heated defrost. Once the
compressor energizes, the cumulative compressor run timer starts (4 hours F-7
and earlier or 5 hours F-8 and later). When the cumulative compressor run timer
terminates, defrost begins. Cabinet temperature is not displayed during defrost; "dEF"
is displayed in its place. When the defrost thermistor warms to 45°F (7.2°C), defrost
terminates. A 3-minute compressor delay timer, a 7-minute evaporator fan motor delay
timer, and an 18-minute temperature display delay timer start. As the delay timers
terminate, the related components energize. Note that the 7-minute evaporator fan
motor delay time is a maximum; if the defrost thermistor cools to 25°F (-3.9°C) before
the 7-minute evaporator fan motor delay timer terminates, the evaporator fan motor
will energize. Freezers have a minimum defrost interval of 4hours. The minimum
defrost time is 5 minutes and the maximum defrost time is 1hour.