GE GSS25, GSS22, GSS20 Abnormal Operating Characteristics Incorrect Operation, Adaptive Defrost

Normal Operating Characteristics That Are Different from Previous Models

•Icemaker auger rotates clockwise.

•Evaporator fan running, without compressor or condenser fan.

•Post Dwell (Adaptive Defrost), compressor, and condenser fan on with evaporator fan off after defrost cycle.

•Liner Protection Mode, fan comes on when the doors are open for 3 minutes.

•Evaporator fan and compressor can run continuously for 2 hours (Adaptive Defrost).

•Different sound levels can be heard when the fan changes speed.

•Response time for drastic temperature change is 2 to 10 minutes. The main control board will only respond to 8 degrees (Fahrenheit) of temperature change per minute as determined by resistance of sensor.

Abnormal Operating Characteristics (Incorrect Operation)

•Evaporator fan on, compressor off, and damper shut (except liner protection mode).

•Rapid fan speed changes, fan takes at least 1 minute to change speeds.

•Compressor running without the condenser fan. The compressor and condenser fan should always run at the same time.

•Length of time the compressor has run since the last defrost cycle.

•Amount of time the defrost heaters were on in the last defrost cycle.

Adaptive Defrost is divided into 5 separate cycles. Those operations are:

•Cooling Operation

•Pre-Chill Operation

•Defrost Heater Operation

•Dwell Period

•Post Dwell

(See Pub. #31-9062 for more information on Adaptive Defrost.)

Cooling Operation (Adaptive Defrost)

During the cooling operation, the main control board monitors door opening (fresh food and freezer doors) and compressor run times. The board counts the time the doors are open. It reduces the length between defrosts by 255 seconds (multiplication factor) for each second that each door is open. If both doors are open, it reduces it by twice the amount. The multiplication factor reduces compressor run time. If the doors are not opened, the compressor will run up to 60 hours between defrosts. If the doors are opened frequently and/or for long periods of time, the compressor run time between defrosts will be reduced to as little as 8 hours.

Adaptive Defrost

Adaptive Defrost can be described as a defrost system that adapts to a refrigerator’s surrounding environment and household usage.

Unlike conventional defrost systems that use electromechanical timers with a fixed defrost cycle time, Adaptive Defrost utilizes an intelligent, electronic control to determine when the defrost cycle is necessary. In order to accomplish the correct defrost cycle time, the main control board monitors the following refrigerator operations:

•Length of time the refrigerator doors were open since the last defrost cycle.

Pre-Chill Operation (Adaptive Defrost)

F	F˚ / C˚	PRE-CHILL MODE
R
E	25˚ / -4˚
E
Z	20˚ / -7˚
E
R	15˚ / -9˚
A	10˚ / -12˚
I
R
T	5˚ / -15˚
E	0˚ / -18˚
M
	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00
P
	-5˚ / -21˚
E
R	-10˚ / -23˚
A
T
U	-15˚ / -26˚
R
SE	-20˚ / -29˚

Pre-Chill Defrost

When the main control board determines that defrost is necessary, it will force the refrigerator

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