Norcold N620 Service Manual

Contents

Norcold N620 Service Manual Manual pdf 19 page image

Service Manual 19Control Diagnostic Function(models N620, N621, N820, and N821)The Control Diagnostic Function allows the repair technicianto put the refrigerator control into a diagnostic display mode.This mode provides the repair technician with specificdiagnostic information which can be helpful when trouble-shooting refrigerator control problems.The diagnostic display mode consists of eight differentdisplay screens. While each of these screens show differentinformation, they all use the individual segments of the 7-segment display. The individual segments are:To put the refrigerator control into the diagnostic displaymode, push the TEMP SET and MODE buttons at the sametime and hold them for five seconds. “1”, which meansdiagnostic screen #1, will appear for two seconds. Thecontents of diagnostic screen #1 will then appear until youpush the MODE button again.Each time you push the MODE button, the next diagnosticscreen # appears for two seconds and then the contents ofthe diagnostic screen appears. After screen # 9, the diagnos-tic screens start again with screen #1.Diagnostic Screen #1:All display segments appear.Diagnostic Screen #2:No display segments appear.Diagnostic Screen #3: Thermistor TemperatureThe thermistor temperature appears in °F.- The first digit of the temperature appears for one secondand the second digit of the temperature appears for onesecond.- Then no segments appear for a two second pause.- This cycle repeats until you push the MODE button.s e g m e n t 1s e g m e n t 2 s e g m e n t 3s e g m e n t 7s e g m e n t 5 s e g m e n t 6s e g m e n t 4A rt01 075Diagnostic Screen #4: Fault HistoryIndividual segments appear for these recorded faults:Segment 1 ............ Ignition fault.Segment 2 ............ Door ajar.Segment 3 ............ DC voltage low.Segment 4 ............ DC voltage high.Segment 5 ............ AC mode selected but not available.Segment 6 ............ AC relay stuck closed.Segment 7 ............ AC heater failed open.Diagnostic Screen #5: Fault History - ContinuedIndividual segments appear for these recorded faults:Segment 1 ............ Thermistor failure.Segment 2 ............ Flame sense failure.Diagnostic Screen #6: Erase Fault History“E” appears for one second. Then “r” appears for onesecond. After a two second pause, the cycle continues torepeat as long as this display screen is active.To erase the fault history:- Push “TEMP SET” for five seconds.- “C” appears for one second.- Then “L” appears for one second.- After a two second pause, the cycle continues torepeat as long as this state is active.- Push “TEMP SET” again for five seconds.- “E” appears for one second.- Then “r” appears for one second.- After a two second pause, the cycle continues torepeat as long as this display screen is active.Diagnostic Screen #7: InputsIndividual segments appear for these inputs to the refrigera-tor controls:Segment 1 ............ Door of the fresh food compartment isclosed and interior light is off.Segment 2 ............ Burner flame is sensed.Segment 3 ............ Thermistor is sensed.