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Summary of Contents for Norcold DC440
- Page 1 Refrigerator Service Manual Models: DC440, DC451, DC490 DE441, DE451, DE461, DE490 MRFT415, MRFT440, MRFT460 NORCOLD, INC. P.O BOX 4248 SIDNEY, OH 45365-4248 Part No.619730E (01/01)
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Page 2: Trouble Shooting - Table Of Contents
Trouble Shooting - Table of Contents -- Procedure A - Thermostat “ON” Compressor does not run ............3 -- Procedure B - Compressor Resistance ..................4 -- Procedure C - Power Supply Output Voltage ................5 -- Procedure D - Compressor Amp Draw ..................6 -- Procedure E - Evaporator Thermister Resistance ............... -
Page 3: Trouble Shooting - Procedure A
Trouble Shooting - Procedure A Thermostat "ON" Compressor does not run Change Temperature DC 0 V Short Circuit Control Measure terminal Power Supply Change Is Temperature voltage of Temperature DC 5 V Failure Power Supply Control LED on? Control between TP1 &... -
Page 4: Trouble Shooting - Procedure B
Trouble Shooting - Procedure B Compressor Resistance Note: Perform procedure at room temperature. Change Internal Compressor Cooling Unit Failure Measure compressor resistance Normal See Procedure C +/-.5 ART01192 Turn the refrigerator to OFF. Remove the black wire to the compressor. Measure the resistance of the compressor bewteen Point A and Point B. -
Page 5: Trouble Shooting - Procedure C
Trouble Shooting - Procedure C Power Supply Output Voltage Below Change Power Supply Power Supply 15 V AC Power Supply Failure Failure Measure voltage Measure voltage between A & B between A & B Check F3 fuse Power Supply Remove Power 0 V AC at the compressor at the compressor... -
Page 6: Trouble Shooting - Procedure D
Trouble Shooting - Procedure D Figure 5 - Measuring Amp draw of Compressor... -
Page 7: Trouble Shooting - Procedure E
Trouble Shooting - Procedure E Thermister Check-Out Turn the refrigerator to OFF to measure resistance 1.6K - 29K Ω = good Thermistor. of the Evaporator Thermistor. Ω = openThermistor windings. An open Disconnect the three pole connector (Figure 6) Thermistor will stop compressor operation. Measure resistance (Figure 7). -
Page 8: Trouble Shooting - Procedure F
Trouble Shooting - Procedure F... -
Page 9: Trouble Shooting - Procedure G
Trouble Shooting - Procedure G... -
Page 10: Trouble Shooting - Procedure H
Trouble Shooting - Procedure H Auto-Shut Off Device Trouble Shooting Shut-Off Device WARNING Do not operate refrigerator with Shut-OFF Device disconnected. Operating the refrigator without device may cause compressor failure. To determine if Shut-OFF Device is functional, disconnect the Shut-Off Device from the Temperature Control. - Page 11 Trouble Shooting - Wiring Schematic 10 or 8 AMP Blade Fuse Battery In + DC Out + DC DC 12-32 V - DC Black Battery In - Black DC Out Orange AC - IN (L) AC/DC DC 24 V AC 85-132 V White Converter AC -...
- Page 12 Ventilation - Procedure I Ventilation is necessary for the correct operation of the refrigerator and to increase the life of the refrigerator cooling system. Ventilation allows the natural air flow that is necessary for good refrigeration. Cooler air comes in from the living area of the vehicle through a lower intake vent, goes around the refrigerator coils where it removes the excess heat from the refrigerator components, and goes out into the living area of the vehicle through an upper exhaust vent.
- Page 13 In addition to the required vents sizes, a fan can be added to increase the refrigerator performance and to decrease the refrigerator current consumption . A fan kit is available through Norcold part distribution network. Refer to Fan Kit Assembly chart on page 12.
- Page 14 Ventilation - Procedure I l n I l n I l t u l t u l n I l n I l t u l t u l n I l n I l t u l t u l n I l n I l t u...
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Page 15: Trouble Shooting - Quick Reference
Trouble Shooting - Quick Reference 1. Check for 12 VDC (supply voltage) at rear of the refrigerator. Turn refrigerator ON, operating volt- age is between 10.5 VDC to 32 VDC. 2. Check for voltage (15 VAC-25 VAC) at compres- sor between points A and B. If voltage is not within range, refer to Procedure C on page 5. - Page 16 !" #$% & &...
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Questions and answers
The fridge works on 12 volt but not on AC 120. It did previously before.. Any ideas?
The Norcold DC440 fridge may not be working on AC 120 volts due to several possible reasons:
1. High Ambient Temperature Shutoff: If the vehicle air temperature exceeds 110°F, the refrigerator shuts off automatically to prevent overheating. An audible alarm will sound in this case.
2. Power Supply or Converter Issue: The fridge uses an AC/DC converter. If the AC 120V input is not converting properly to the required DC voltage, the fridge will not operate.
3. Blown Fuse: A blown 10 or 8 AMP blade fuse in the AC/DC circuit could cause the fridge to stop working on AC power.
4. Wiring Issues: Faulty or disconnected wiring in the AC input (orange and white wires for AC IN L and N) may interrupt power delivery.
5. Thermostat Reset Needed: After a shutoff, the thermostat must be turned to OFF and then back to the desired setting to restart the refrigerator.
6. Failed Components: Faulty components such as the control board, compressor, or fan motor could prevent operation.
Each of these should be checked to diagnose the issue.
This answer is automatically generated