Introduction ------------------------------------------------------ 1
About this Manual ................................................................. 1
Model Identification ............................................................... 1
Information Label .................................................................. 1
Cooling Unit Serial Number .................................................. 1
Certification and Code Requirements .................................. 1
About Installation .................................................................. 1
Replacement Parts ............................................................... 1
Technical Assistance............................................................. 1
Safety Awareness --------------------------------------------- 3
Safety Notice ......................................................................... 3
Attention Statements ............................................................. 3
Safety Statements ................................................................. 3
Specifications --------------------------------------------------- 4
N61X/N81X Models .............................................................. 4
N62X/N82X Models .............................................................. 5
N64X/N64X.3/N84X/N84X.3 Models .................................... 6
Troubleshooting – Quick Reference Guide ----------- 7
N61X/N81X Displayed Fault Codes ---------------------- 8
N62X/N82X Displayed Fault Codes ---------------------- 9
N64X/N84X Displayed Fault Codes ---------------------10
Troubleshooting Flowcharts ------------------------------ 11
Blank Display – Refrigerator does not turn on ................... 11
F/no FL Fault Code – Burner failed to ignite or reignite ..... 12
S/Sr Fault Code – Flame sense circuit failure .................... 13
dc LO Fault Code – Low DC voltage .................................. 13
dc HI Fault Code – DC voltage high ................................... 14
dc rE Fault Code – DC relay stuck closed ......................... 14
dc HE Fault Code – DC heater failed open ........................ 15
A/no AC Fault Code – No AC power available ................... 16
r/AC rE Fault Code – AC relay stuck closed ...................... 16
AC HI Fault Code – AC voltage high .................................. 17
AC LO Fault Code – AC voltage low .................................. 17
H/AC HE Fault Code – AC heater failed open ................... 18
Food Compartment Lamp Switch ....................................... 19
Lamp Switch Operation ..................................................... 19
d/dr Fault Code – Door open for more than 2 minutes ...... 19
Lamp Switch Testing Procedure ....................................... 19
Thermistor Failure Fault – Controls in backup operating
system mode ....................................................................... 20
Backup Operating System (BOS) ....................................... 20
N61X/N81X Backup Operation. ........................................ 20
N62X/N82XN64X/N84X Backup Operation ...................... 20
Power Board Resetting Procedure ..................................... 21
n/no co Fault Code – No cooling detected by the controls 21
Ventilation -------------------------------------------------------22
Roof Exhaust Venting ......................................................... 22
Air Intake Vent ..................................................................... 22
Roof Exhaust Vent .............................................................. 22
Baffles ................................................................................. 23
Vertical Angled Baffles ...................................................... 23
Double Sidewall Venting ..................................................... 24
Air Intake Vent ................................................................... 24
Sidewall Exhaust Vent ...................................................... 24
LP Gas System ------------------------------------------------27
Pressure Requirements ...................................................... 27
Testing for LP Gas Leaks ................................................... 27
Components ........................................................................ 28
Solenoid Gas Valves ......................................................... 28
New Style Solenoid Gas Valve ......................................... 28
Old Style Solenoid Gas Valve ........................................... 28
Solenoid Gas Valve Connections ..................................... 28
Orifice ................................................................................ 29
Burner ................................................................................ 29
Burner Tube ...................................................................... 29
Flue ................................................................................... 30
Heat Deflector ................................................................... 30
Flue Baffle ......................................................................... 30
Flame Appearance .............................................................. 30
Burner Cleaning Procedure ................................................ 31
Electrical Requirements and Components-----------33
DC Voltage Requirements and Polarity .............................. 33
Power Board DC Fuse ...................................................... 33
DC Power Wiring Requirements ......................................... 33
2-Way Models ................................................................... 33
3-Way Models ................................................................... 33
AC/DC Converter as Power Source ................................... 33
DC Heater–3-Way Refrigerators Only .............................. 33
DC Heater Circuit Fuse ..................................................... 33
Lamp Assembly ................................................................. 34
Divider Heater ................................................................... 34
AC Heater ......................................................................... 34
AC Power Requirements .................................................... 34
AC Heater Fuse ................................................................ 34
AC Power Cord ................................................................. 35
Power Cord for Ice Maker Units ........................................ 35
12 Vdc Ventilation Fan ........................................................ 35
Cooling Unit ----------------------------------------------------37
Description .......................................................................... 37
Heat Absorption ................................................................ 37
Leveled Operation ............................................................. 37
Gradual Decrease in Cooling Efficiency ............................. 37
Cooling System Monitoring ................................................. 37
First "No Cooling" Fault Occurrence ................................. 37
Two Recorded "No Cooling" Fault Occurrences .............. 37
Troubleshooting Cooling Faults .......................................... 38
Poor or No Cooling on AC Mode ...................................... 38
Poor or No Cooling on LP Gas Mode ............................... 38
Poor or No Cooling on DC Mode – 3-Way Models ........... 38
Refrigerant Leakage ........................................................... 38
Disposal of Cooling Unit ..................................................... 38
Cooling System Diagnostic Flowchart ................................ 39
Replacing the Cooling Unit ................................................. 41
Removing the Refrigerator from the Enclosure ................ 41
Removal of Cooling Unit ................................................... 42
Installation of Replacement Cooling Unit ........................ 42
Reinstallation of Refrigerator into Enclosure .................... 44
Electronic Components ------------------------------------45
Power Board ....................................................................... 45
Removal–Power Board ..................................................... 45
Installation–Power Board .................................................. 46
Optical Control Assembly ................................................... 46
N61X/N81X Wiring Schematic ............................................ 47
N61X/N81X Wiring Pictorial ................................................ 47
N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Pictorial –
Units with serial number 851759 and higher ..................... 48
N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Schematic –
Units with serial number 851759 and higher ..................... 48
N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Pictorial –
Units with serial number lower than 851759 ...................... 49
N62X/N82X/N64X/N84X/N64X.3/N84X.3 Wiring Schematic –
Units with serial number lower than 851759 ...................... 50
Controls ----------------------------------------------------------51
N61X/N81X Optical Control Assembly ............................... 51
Front Box ........................................................................... 51
Removal and Installation of Optical Control Assembly. .... 51
Modes of Operation ............................................................ 52
ii Refrigerator Service Manual N6XX/N8XX Models
AUTO Mode ...................................................................... 52
No AC Power ..................................................................... 52
AC Power Restored .......................................................... 52
No AC and No Flame ........................................................ 52
GAS Mode ......................................................................... 52
No Flame ........................................................................... 52
Backup Operating System .................................................. 52
“Gas Lock-Out” ................................................................... 52
N62X/N82X Optical Control Assembly ............................... 53
Front Box ........................................................................... 53
Removal and Installation of Optical Control Assembly..... 53
Modes of Operation ............................................................ 54
AUTO Mode ...................................................................... 54
AUTO AC Operation ......................................................... 54
AUTO LP Gas Operation .................................................. 54
Shift from AUTO LP GAS to AUTO AC ............................. 54
No AC Power and No Flame ............................................. 54
Troubleshooting a "F"/"no" "FL" and "A"/"no" "AC" Faults 54
AC-Manual Mode .............................................................. 54
LP Gas–Manual Mode ...................................................... 54
No AC Power or Loss of AC Power .................................. 55
Troubleshooting a "A"/"no" "AC" Fault .............................. 55
AC Power Restored .......................................................... 55
Flame Fails to Ignite or Flame Goes Out ......................... 55
Clearing "Gas Lock-Out" ................................................... 55
Troubleshooting a "F"/"no" "FL" Fault ............................... 55
N64X/N84X Optical Control Assembly ............................... 56
Front Box ........................................................................... 56
Removal and Installation of Optical Control Assembly..... 56
Modes of Operation ............................................................ 57
AUTO ................................................................................ 57
AUTO AC Operation ......................................................... 57
AUTO LP Operation .......................................................... 57
Shift from AUTO LP GAS to AUTO AC ............................. 57
No AC Power and No Flame ............................................. 57
Shift from AUTO LP GAS to AUTO AC ............................. 57
Troubleshooting No Flame and No AC Faults .................. 57
AUTO DC Operation – 3-Way Units Only ......................... 58
AC-Manual Mode ................................................................ 58
No AC Power or Loss of AC Power .................................. 58
AC Power Restored .......................................................... 58
Troubleshooting "no" "AC" Fault ....................................... 58
LP-Manual Mode................................................................. 59
Flame Fails to Ignite or Flame Goes Out ......................... 59
DC-Manual Mode ................................................................ 59
No DC Power to DC Heater Circuit .................................. 59
Diagnostic Mode — Models N62X/N82X --------------60
Diagnostic Mode ................................................................. 60
Accessing the Diagnostic Mode ....................................... 60
Changing Screens ............................................................ 60
Exiting the Diagnostic Mode ............................................. 60
Screens and Diagnostic Segments Information ............... 61
Diagnostic Mode — Models N64X/N84X --------------63
Diagnostic Mode ................................................................. 63
Accessing the Diagnostic Mode ....................................... 63
Changing Screens ............................................................ 63
Exiting the Diagnostic Mode ............................................. 63
Screens and Diagnostic Segments Information ................. 64
Ice Maker --------------------------------------------------------66
Wire Harness ...................................................................... 66
Fill Tube .............................................................................. 66
Water Valve ......................................................................... 66
Specifications ...................................................................... 66
Replacing the Ice maker ..................................................... 67
Ice Maker Troubleshooting Chart ....................................... 67
Cycle Test ........................................................................... 68
Water Fill Adjustment .......................................................... 69
Low Ice Yield ....................................................................... 69
Water Valve Operation Test ................................................ 69
Water Valve Solenoid Resistance ...................................... 69
Mold Heater Resistance Check .......................................... 70
Checking Voltage at Motor Terminals ................................. 70
Winterizing the Ice Maker Water ........................................ 70
N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to
Refrigerator AC Cord .......................................................... 70
N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to
Refrigerator AC Cord .......................................................... 70
N64X IM/N84XIM – Wiring Schematic for Ice Maker Wired to
White AC Power Cord ......................................................... 72
N64X IM/N84XIM – Wiring Pictorial for Ice Maker Wired to
White AC Power Cord .........................................................