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For models N620 and N621:
For models N640 and N641:
For models N640-IM and N641-IM: 6 cu.ft., 2 way or 3-way, R.V. refrigerators with ice maker.
For models N820 and N821:
For models N840 and N841:
For models N840-IM and N841-IM: 8 cu.ft., 2-way or 3-way, R.V. refrigerators with ice maker.
These model numbers are 2-way refrigerators. The model numbers of 3-way refrigerators
include ".3".
NORCOLD, Inc.
P.O. Box 4248
Sidney, OH 45365-4248
Service Manual
6 cu.ft., 2-way, R.V. refrigerators.
6 cu.ft., 2-way or 3-way, R.V. refrigerators.
8 cu.ft., 2-way, R.V. refrigerators.
8 cu.ft., 2-way or 3-way, R.V. refrigerators.
Part No. 619394 (5-98)

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Summary of Contents for Norcold N620

  • Page 1 Service Manual For models N620 and N621: 6 cu.ft., 2-way, R.V. refrigerators. For models N640 and N641: 6 cu.ft., 2-way or 3-way, R.V. refrigerators. For models N640-IM and N641-IM: 6 cu.ft., 2 way or 3-way, R.V. refrigerators with ice maker.
  • Page 2: Table Of Contents

    Backup Operating System ............9 of the hazard. Carefully read the descriptions of these signal Fault Codes (models N620, N621, N820, and N821) ..10 words to fully know their meanings. They are for your safety. Fault Codes (models N640, N641, N640-IM, N641-IM, N840, .
  • Page 3: Specifications

    - A circuit overload can result in an electrical fire if the - Do not spray liquids near electrical outlets, connec- wires and/or fuse sizes used are not correct. Use only tions, or the refrigerator components. Many liquids are the wire and fuse sizes written in the “Installation electrically conductive and can cause a shock hazard Manual”...
  • Page 4: Operating Requirements

    Operating Requirements c i f c i f c i f c i f , s l g i l , t h , s l g i l , t h , s l g i l , t h , s l g i l , t h...
  • Page 5: Ventilation Requirements

    If this air flow is blocked or decreased, the refrigerator may not cool correctly. Each NORCOLD model is certified by AGA and CGA for correct ventilation. Service Manual 5...
  • Page 6: Electrical Components

    Do not remove the Operating the Refrigerator Controls round ground prong from the power cord. Do not use a (models N620, N621, N820, and N821) two-prong adapter or an extension cord. Operation of the refrigerator without a correct ground could cause dangerous electrical shock or death if you are touching the metal parts of the refrigerator or the vehicle.
  • Page 7 The MODE button [8] controls the operation mode of the Manual mode operation: refrigerator. When you select one of the manual modes of operation, The - Push and hold the MODE button and a light bar flashes in light bar beside the AUTO goes out in the center display and the center display beside each of the four operating only the light bar beside either AC, LP GAS, or DC remains.
  • Page 8: N640-Im, N641-Im, N840, N841,N840-Im,And N841-Im)

    Operating the Refrigerator Controls Automatic mode operation: (models N640, N641, N640-IM, N641-IM, When you select AUTO mode, the refrigerator controls N840, N841, N840-IM, and N841-IM) automatically select the most efficient energy source that is available for operation. If a more efficient energy source becomes available, the refrigerator controls change from the Control panel: current energy source to the more efficient energy source.
  • Page 9: Backup Operating System

    (2-way models only). - The owner should have the refrigerator serviced by a - In the Manual mode and operating on propane gas: dealer or an Norcold authorized Service Center as soon as possible. - An audible alarm starts. - The fault code “no” “FL” shows in the center display.
  • Page 10: Fault Codes (Models N620, N621, N820, And N821)

    Fault Codes (models N620, N621, N820, and N821) " " a t l a l i " . " l " " d F " . " r " " F L " t i n u l i . "...
  • Page 11: Fault Codes (Models N640, N641, N640-Im, N641-Im, N840, . N841,N840-Im,And N841-Im)

    Fault Codes (models N640, N641, N640-IM, N641-IM, N840, N841, N840-IM, and N841-IM) " " a t l a l i " . " l d " " r e l i F " . " r n " " o F "...
  • Page 12: Troubleshooting

    Troubleshooting Service Manual 12...
  • Page 13: Propane Gas Ignition Failure

    Service Manual 13...
  • Page 14: Fresh Food Compartment Door Ajar

    Service Manual 14...
  • Page 15: Ac Voltage Too Low

    Service Manual 15...
  • Page 16: Dc Voltage Too High

    AC Heater O utput Failure. Th e co ntrol sen ses AC R e place h ea ter curre nt w h en th e A C p ow e r boa rd. h ea ter sho uld b e O FF. A rt01 063 DC Heater O utput Failure.
  • Page 17: Dc Heater Failed Open

    Service Manual 17...
  • Page 18: Flame Sense Circuit Failure

    Service Manual 18...
  • Page 19: Control Diagnostic Function (Models N620, N621, N820, And N821)

    Control Diagnostic Function Diagnostic Screen #4: Fault History (models N620, N621, N820, and N821) Individual segments appear for these recorded faults: Segment 1 .... Ignition fault. The Control Diagnostic Function allows the repair technician Segment 2 .... Door ajar. to put the refrigerator control into a diagnostic display mode.
  • Page 20: Control Diagnostic Function (Models N640, N641, N640-Im, N641-Im, N840, N841,N840-Im,And N841-Im)

    Diagnostic Screen #8: Outputs Each time you push the MODE button, the next diagnostic screen # appears for two seconds and then the contents of the diagnostic screen appears. After screen # 0 (ten), the Individual segments appear for these outputs from the diagnostic screens start again with screen #1.
  • Page 21: Ice Maker (Models N640-Im, N641-Im, N840-Im And N841-Im)

    - Push “TEMP SET” again for five seconds. Ice Maker (models N620-IM, N621-IM, N820-IM, - “E” “r” appears for one second and then pauses for and N821-IM) two seconds. - The cycle continues to repeat as long as this display The ice maker is assembled to the refrigerators at the factory screen is active.
  • Page 22: Common Problems And Solutions

    Trouble Shooting: Common Problems and Solutions: Before using the following Trouble Shooting Chart: If the refrigerator is cooling, but there is no ice in the ice bin [4] (See Art01015): - Make sure that 10.5 VDC min. - 15.4 VDC max. control voltage is available to the refrigerator.
  • Page 23: Ice Maker Does Not Make Ice

    Service Manual 23...
  • Page 24: Refrigerator Maintenance

    Diagnosing Cooling Problems Refrigerator Maintenance WARNING: The refrigerator cooling system is under Gas flame appearance: pressure. Do not try to repair or to recharge a defective cooling system. The cooling system contains sodium While in propane gas operation, examine the gas flame: chromate.
  • Page 25: Fuse Replacement

    - If the cooling problem does not occur when operating on 4. Remove the DC wiring from the refrigerator: all energy sources, the problem is not the cooling unit. - Put a mark on the DC wires so you can put them back in - Use the “Troubleshooting”...
  • Page 26: Wiring Pictorial

    (See Art01016): 1 ....Display overlay (models N640, N641, N640-IM, N641-IM , N840, N841,N840-IM, and N841-IM) 1 ................ 120V AC Hot 2 ...... Display overlay (models N620, N621, N820 2 ................PC Board and N821) 3 ..............Ground screw 3 ....Display board (models N640, N641, N640-IM, 4 ................
  • Page 27 Service Manual 27...
  • Page 28 Service Manual 28...
  • Page 29 Service Manual 29...
  • Page 30 Service Manual 30...

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