GE GSS20 Series Technical Service Manual

Also see for GSS20 Series: Technical service guide

GE GSS20 Series Technical Service Manual Manual pdf 15 page image

– 15 –Diagnostic ChartFREEZERDISPLAYFRESH FOODDISPLAY DIAGNOSTICS RESULTS COMMENTS0 2 Communication check betweenTemperature Control and Main Control“P” on freezer display if OK,“F” if problem is found.0 4 Communication check betweenDispenser Control and Main Control“P” on freezer display if OK,“F” if problem is found. Dispenser models only.0 5 Encoder TestAs the knob is rotated, thedisplay will show thecorresponding setting.Only for models withtemperature controlknobs.0 7 Control and Sensor System TestChecks each thermistor anddisplays “P” for pass and “0”for fail.See Note 1.0 8 Duct Door Test Opens the dispenser duct doorfor 10 seconds, then closes.Only for dispensers with5 or more touch pads.1 0 Dampers Test Opens each damper, pausesbriefly, and then closes.Includes Custom Cooldampers if applicable.1 1 Fan Test Cycles through each fan for 10seconds.1 2 100% Run Time Sealed system on 100% of thetime. Times out after 1 hour.1 3 Prechill Test Starts Prechill mode. Unitreturns to normal on its own.1 4 Defrost Test Toggles on the Defrost cycle.See Note 2.Must press again to turnheaters off. See Note 2.1 5 Main Control Reset Causes a system reset.1 6 Exit Diagnostic Mode Causes a temperature controlboard reset.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.