Diagnostic Chart - GE GSS20 Series Technical Service Manual

FREEZER FRESH FOOD
DISPLAY DISPLAY
0 2
0 4
0 5
0 7
0 8
1 0
1 1
1 2
1 3
1 4
1 5
1 6
Note 1. Display order is: #1 = Fresh Food 1, #2 = Fresh Food 2, #3 = Custom Cool, #4 = Evaporator, #5 = Freezer.
Thermistor test results are: P = Pass, 0 = Fail, S = Short to 5 VDC, B = Bad amplifier (replace main control).
Note 2. You must enter the defrost test again to toggle the defrost heater off at the end of the test.
The heater will not come on if the evaporator thermistor is warm.
Refer to Service Guide 31-9072 for additional information.

Diagnostic Chart

DIAGNOSTICS
Communication check between
Temperature Control and Main Control
Communication check between
Dispenser Control and Main Control
Encoder Test
Control and Sensor System Test
Duct Door Test
Dampers Test
Fan Test
100% Run Time
Prechill Test
Defrost Test
Main Control Reset
Exit Diagnostic Mode
– 15 –
RESULTS
"P" on freezer display if OK,
"F" if problem is found.
"P" on freezer display if OK,
"F" if problem is found.
As the knob is rotated, the
display will show the
corresponding setting.
Checks each thermistor and
displays "P" for pass and "0"
for fail.
Opens the dispenser duct door
for 10 seconds, then closes.
Opens each damper, pauses
briefly, and then closes.
Cycles through each fan for 10
seconds.
Sealed system on 100% of the
time. Times out after 1 hour.
Starts Prechill mode. Unit
returns to normal on its own.
Toggles on the Defrost cycle.
See Note 2.
Causes a system reset.
Causes a temperature control
board reset.
COMMENTS
Dispenser models only.
Only for models with
temperature control
knobs.
See Note 1.
Only for dispensers with
5 or more touch pads.
Includes Custom Cool
dampers if applicable.
Must press again to turn
heaters off. See Note 2.