Refrigerator
Service Manual
Models:DC440, DC451, DC490DE441, DE451, DE461, DE490MRFT415, MRFT440, MRFT460
Part No.619730E (01/01)
NORCOLD, INC.
P.O BOX 4248
SIDNEY, OH 45365-4248
Page 1: ...Refrigerator Service Manual Models DC440 DC451 DC490 DE441 DE451 DE461 DE490 MRFT415 MRFT440 MRFT460 Part No 619730E 01 01 NORCOLD INC P O BOX 4248 SIDNEY OH 45365 4248...
Page 2: ...Resistance 7 Procedure F Insufficient Coolling 8 Procedure G Refrigerator to Cold 9 Procedure H Auto Shut OFF Device 10 Wiring Schematic 11 Procedure I Ventilation 12 14 Quick Reference Repair Sheet 1...
Page 3: ...V Short Circuit Power Supply Failure Normal Change Temperature Control Change Power Supply See Procedure B Good Check DC Fuse Bad Replace fuse if defective 10A DE DC 8A MRFT See Figure 2 Compressor ru...
Page 4: ...OFF Remove the black wire to the compressor Measure the resistance of the compressor bewteen Point A and Point B A B Note Perform procedure at room temperature Change Cooling Unit Measure compressor r...
Page 5: ...pply Failure Power Supply Failure Remove Power Supply Measure voltage between A B at the compressor ART01196 Check F3 fuse on circuit board Ohms Replace Power Supply Cooling Unit 0 Ohms Replace Power...
Page 6: ...6 Trouble Shooting Procedure D Figure 5 Measuring Amp draw of Compressor...
Page 7: ...able 1 Thermister Check Out Trouble Shooting Procedure E openThermistor windings An open Thermistor will stop compressor operation Replace Thermistor 1 6K 29K good Thermistor e c n a t s i s e R r o t...
Page 8: ...8 Trouble Shooting Procedure F...
Page 9: ...9 Trouble Shooting Procedure G...
Page 10: ...ot restart until the refrigerator is manually turned off and the air temperature is lower than 110 F Operating the refrigerator in high ambient temperatures can overheat the cooling unit and cause pre...
Page 11: ...Ambient Thermistor Black Brown Yellow Orange Red AC DC Part DC Inverter Electronic Current Protector Inverter DC 44 5 V 40 W DC 51 V 60 W DC 24V Fan Motor Fan Red Black Red Black Blue Black Output AC...
Page 12: ...ts or cabinets Each refrigerator has specified minimum vent size requirements See page 12 However more air flow over the refrigerator coils increases the cooling performance of the refrigerator If the...
Page 13: ...e added to increase the refrigerator performance and to decrease the refrigerator current consumption Afan kit is available through Norcold part distribution network Refer to Fan Kit Assembly chart on...
Page 14: ...0 0 1 t e l t u O s e h c n I e r a u q S 0 0 1 t e l n I s e h c n I e r a u q S 5 3 t e l t u O s e h c n I e r a u q S 5 3 8 2 1 4 4 V E E D t e l n I s e h c n I e r a u q S 0 0 1 t e l t u O s e...
Page 15: ...ing at com pressor between points A and B If Ohms is not within range refer to Procedure B on page 4 4 Take an Amp 1 5 2 5 Amps reading at the black wire with rubber boot connected to the compres sor...
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