Service Manual

Product Information

Product Colour Options: Silver (SL), Champagne (SN), Stainless (ST)

Destination Markets: Malaysia, Hong Kong, Singapore, India, Vietnam, RBD, Indonesia, Philippines, PGF, GULF (Gen)

CFCs Information: CFCs were historically used in refrigerants and insulation materials. However, due to their ozone-depleting effects, an international ban on harmful CFCs was implemented by the end of 1995. This product is 100% CFC Free.

Table of Contents

1. Safety Cautions for Repairing

   1. Warning
   2. Caution

2. Specification and Components

   1. NR-BW414SS, NR-BW414MN, NR-BW414VS, NR-BW414XN
   2. NR-BW464VS, NR-BW464XN

3. Performance Data

   1. NR-BW414MN, NR-BW414SS, SN, SW
   2. NR-BW414VS, NR-BW414XN
   3. NR-BW464VS, NR-BW464XN

4. Self Protecting Function

   1. Protection for IC
   2. Protection for compressor locked
   3. Protection for power supply dropping

5. Self Diagnosing Function

6. Temperature Control

7. Refrigerator Instruction Guidelines

8. Troubleshooting Guide

   1. Not cool at all [Both PC and FC (compressor does not operate)]
   2. Cool, not enough [Both PC and FC (compressor operates)]

9. Schematic Diagram

   1. Wiring Connection: NR-BW414MN, NR-BW414SS, SN, SW
   2. Wiring Connection: NR-BW414VS, NR-BW414XN, NR-BW464VS, NR-BW464XN

10. Disassembly Instruction

    1. Cover Control
    2. PAS Control

11. Repairing Procedure

12. Technical Information

    1. NR-BW414MN, NR-BW414SS, SN, SW (Non Inverter)
    2. NR-BW414VS, NR-BW414XN, NR-BW464VS, NR-BW464XN (Inverter)

13. Parts Exploded View and Replacement Parts List

    1. Parts Exploded View: Body
    2. Parts Exploded View: Door
    3. Parts Exploded View: Packing
    4. Replacement Parts List

14. Detail Change Notice

1. Safety Cautions for Repairing

When repairing the refrigerator, please kindly take care of the following cautions:

1.1 Warning

• Before repairing unit, unplug supply cord: Always unplug the supply cord before repairing the refrigerator.
• Use authentic parts when repairing: When replacing parts, use only authentic parts to replace defective ones.
• Caution during brazing: When using a torch for brazing, ensure proper ventilation to prevent carbon monoxide poisoning.
• Pay attention to using refrigerant: If refrigerant touches fire, the gas becomes poisonous.
• Pay attention to getting electricity shock: Do not touch electricity part terminals when checking voltage. Wait at least 3 minutes for capacitor discharge before replacing parts.
• Check safety after repairing: Verify screws, parts, and lead wires are in place. Check for damage to circumferential parts. Check insulation resistance between supply plug and earth. When installing the refrigerator, check the condition of the supply cord and plug. Wipe off dust on the plug. Carefully cut and seal electric devices.

1.2 Caution

• Watch the hot parts: During and after operation, the compressor, pipes, and heater are hot. Do not burn your fingers when touching them.
• Pay attention to refrigerant: Do not touch liquid refrigerant, as it may cause burns.
• Pay attention to edge of parts: Sharp edges may cause cuts.
• Pay attention to fins of evaporator and condenser: Fins may cause cuts.
• Before transportation, adjust the bolt: Improper adjustment may damage the floor.
• Do not touch the pipe after brazing: Hot pipes may cause burns.

2. Specification and Components

2.1 NR-BW414SS, NR-BW414MN, NR-BW414VS, NR-BW414XN

Specification (NR-BW414 Series)

Sealed Unit (NR-BW414 Series)

Electric Part (NR-BW414 Series)

2.2 NR-BW464VS, NR-BW464XN

Specification (NR-BW464 Series)

Sealed Unit (NR-BW464 Series)

Electric Part (NR-BW464 Series)

3. Performance Data

3.1 NR-BW414MN, NR-BW414SS, SN, SW

3.2 NR-BW414VS, NR-BW414XN

3.3 NR-BW464VS, NR-BW464XN

4. Self Protecting Function

4.1 Protection for IC

This section describes the protection mechanism for the Integrated Circuit (IC) in the refrigerator's control system.

1. Does IC receive IPM protect signal?
   • YES: IC orders compressor to stop for 10 minutes.
   • NO: Normal operating.
2. After 10 min, does PCB check if IPM protect signal is normal?
   • YES: IC cancels compressor stop. Normal operating.
   • NO: IC continues to stop compressor until 1 hour. IC indicates Self diagnosing sign.
3. After restarting, does "Stop compressor" occur 10 times within 2 min?
   • YES: IC continues to stop compressor until 1 hour. IC indicates Self diagnosing sign.
   • NO: IC cancels compressor stop. Normal operating.
4. Does system protection cycle for 333 times?
   • YES: IC orders compressor to stop completely.
   • NO: After 1 hour, the cycle repeats.

The system protect control cycle involves operating the compressor for 7 minutes x 10 times, followed by a 1-hour stop. This cycle repeats until the 333rd time, after which the compressor stops completely.

4.2 Protection for compressor locked

This section describes the protection mechanism when the compressor is detected as locked.

1. After starting 2 sec., does IC detect rpm <5r/sec? Or after starting from 2 ~ 10 sec., does PCB detect rpm over 120r/sec?
   • YES: IC orders compressor to stop for 10 minutes.
   • NO: Normal operating.
2. IC cancels compressor stop after 10 min.
3. After restarting, does "Stop compressor" occur 10 times within 2 min?
   • YES: IC continues to stop compressor until 1 hour. IC indicates Self diagnosing sign.
   • NO: IC cancels compressor stop. Normal operating.
4. Does system protection cycle for 333 times?
   • YES: IC orders compressor to stop completely.
   • NO: After 1 hour, the cycle repeats.

The system protect control cycle involves operating the compressor for 7 minutes x 10 times, followed by a 1-hour stop. This cycle repeats until the 333rd time, after which the compressor stops completely.

4.3 Protection for power supply dropping

This section describes the protection mechanism when the power supply voltage drops.

1. Does Power supply voltage drop as condition >0.1 sec., and <160V AC?
   • YES: IC orders compressor to stop for 10 minutes.
   • NO: Normal operating.
2. After 10 min, does PCB check power supply voltage if it is > 180V AC?
   • YES: IC cancels compressor stop. Normal operating.
   • NO: IC continues to stop compressor until 1 hour. IC indicates Self diagnosing sign.
3. After restarting, does "Stop compressor" occur 10 times within 2 min?
   • YES: IC continues to stop compressor until 1 hour. IC indicates Self diagnosing sign.
   • NO: IC cancels compressor stop. Normal operating.

5. Self Diagnosing Function

When an abnormality occurs in the refrigerator, the system displays a sign on the LED indicators as shown in the chart below.

How to use “Self diagnosing function”

1. Open the PC door and FC door, then push the "Quick Freezing" button for more than 5 seconds.
2. The "Energy Saving" and "Quick Freezing" LEDs will blink for 3 seconds.
3. After blinking for 3 seconds, each LED will show the status as described in the table.
4. The "Self diagnosing function" will automatically cancel after 7 minutes from the start of operation.

6. Temperature Control

6.1 How to operate “QUICK FREEZING” (Quick cool button)

To quickly freeze food and preserve it, press the "Quick Freezing" button. The Green LED will turn ON. The system will operate immediately and automatically stop after 150 minutes (Green LED turns OFF), returning to normal mode.

Remark

• To stop the operation, press the "Quick Freezing" button again (Green LED turns OFF). The system will return to normal mode.
• If the green light LED is flashing, it indicates that the defrosting system is currently working. The quick freezing system will start operation immediately after defrosting is complete.

6.2 How to use the “ENERGY-SAVING” operation

When food storage is minimal, or during nighttime and periods of low door opening frequency, the "ENERGY-SAVING" operation reduces electricity consumption by operating the compressor at a lower speed than normal operation.

6.3 How to save energy

• Press the "ENERGY SAVING" button (Green light turns ON).
• Press the "ENERGY SAVING" button again to stop the operation (Green light turns OFF).

6.4 About energy saving

• Deodorizing function reduces.
• Interior temperature gets slightly higher.
• Frequent opening of the doors raises the interior temperature (higher interior temperature automatically activates normal operation on a temporary basis).
• When "ENERGY SAVING" is activated during "QUICK FREEZING", the "ENERGY SAVING" starts after completing the "QUICK FREEZING".
• The "ENERGY SAVING" operation stops when the power cord is reconnected or after recovering from a power failure.

7. Refrigerator Instruction Guidelines

1. Do not open the refrigerator frequently or leave it open for a long time. This wastes coolness and consumes energy.
2. Do not refrigerate unnecessary items or hard-to-rot foodstuffs like pumpkin, shallot, garlic, or potato, as this will overload the refrigerator and waste storage space.
3. Adjust the temperature according to the actual operating condition for energy saving.
4. Do not refrigerate bottles larger than the door shelf or tray, as the door will not close completely, causing coolness leakage.
5. Frequently check the door opening seal; it must be completely closed to the refrigerator's body. Do not leave the seal dirty, damaged, or deteriorated, as coolness will leak and consume energy unnecessarily.
6. If you will be away for several days or there is nothing refrigerated, disconnect the plug for energy saving. In this case, clean the refrigerator and leave it half-open to prevent bad odor.
7. Clean the drain tray located over the compressor at the back of the refrigerator every three months to prevent odor generated from humidity.
8. Energy saving dryer pipes and heating pipes embedded around the refrigerator cabinet help prevent "sweating" on the outer surface without consuming energy. This makes the outer wall of the refrigerator warm, which is not a malfunction.
9. Drinking water bottles and beverage bottles (e.g., soft drink, fruit juice) should be sealed closely to prevent odor from entering the bottles.

Before calling for servicing, please check as follows:

The refrigerator does not operate.

• Check that the plug and its socket are in good condition.
• Check for any problem with the main fuse and electricity system in the house.

The cooling does not function properly.

• Check that the temperature control button is at the proper position.
• Check if the refrigerator is overloaded or contains hot food.
• Is the refrigerator located directly exposed to sunlight or a heat source?
• Is the refrigerator door closed completely? Is the refrigerator opened frequently?

Vapor generated inside and outside the cabinet.

• Vapor may appear outside the cabinet if the weather is humid (e.g., rainy season) or air circulation is poor.
• If vapor is inside the refrigerator, check that the door is completely closed. Is the refrigerator frequently opened or left open for a long time? Is there any hot food refrigerated in it?

The refrigerator generates noise.

• Check if the refrigerator is located on a stable or even floor.
• Check if any object is in contact with the refrigerator.

8. Troubleshooting Guide

8.1 Not cool at all. [Both PC and FC (compressor does not operate)]

1. Does room light turn on?
   • YES: Proceed to step 2.
   • NO: Check power supply (e.g., connect power cord, check ELCB, overload relay, fuse). Check Control PCB (e.g., fuse, IC (IC205), Diode (BD201)).
2. Pushing PC door switch and room light turns off, and after release PC door switch, does room light turn on?
   • YES: Proceed to step 3.
   • NO: Defect of Control PCB or PC door switch.
3. To start self diagnosing function by opening PC door and FC door and pushing "Quick Freezing" SW for 5 seconds.
4. Does "Energy Saving" and "Quick Freezing" blink?
   • YES: Defect of Control PCB or communication error between IC1 and IC201.
   • NO: Proceed to step 5.
5. Does the "Energy Saving" turn on and "Quick Freezing" blinking?
   • YES: Defect of Control PCB. Abnormal connecting of compressor. Compressor locked. Chock. Leakage. Dropping voltage of power supply. Rising voltage of power supply.
   • NO: Proceed to step 6.
6. Does the "Energy Saving" turn off and "Quick Freezing" blink?
   • YES: Break FC thermistor. Poor connection between FC thermistor and PCB.
   • NO: Proceed to step 7.
7. Does the "Energy Saving" turn off, "Quick Freezing" turn off and "Freezer Control" LED "MAX" blinking?
   • YES: Gas leakage at high pressure side. Poor compression. Defect of Control PCB.
   • NO: Proceed to step 8.
8. Does the "Energy Saving" turn off, "Quick Freezing" turn off and "Freezer Control" LED “MIN” blinking?
   • YES: Gas leakage at low pressure side. Defect of Control PCB.
   • NO: Faulty compressor motor. Compressor lock.

8.2 Cool, not enough. [Both PC and FC (compressor operates)]

To confirm when compressor is operating:

1. When FC door opens and FC door SW pushes, does cold air spout out from exhaust?
   • YES: Proceed to step 2.
   • NO: Defect of FC fan motor. Poor connection between FC fan motor and IC1 on PCB. Defect of FC door SW.
2. When PC door opens and PC door SW pushes, does cold air spout out from exhaust?
   • YES: Proceed to step 3.
   • NO: Defect of Damper. Defect of PC door SW.
3. To start self diagnosing function by opening PC door and FC door and pushing "Quick Freezing" SW for 5 seconds.
4. Does "Energy Saving" and "Quick Freezing" turn on?
   • YES: Defect of FC fan motor. Poor connection between FC fan motor and IC1 on PCB.
   • NO: Proceed to step 4 (second instance).
5. Does "Energy Saving" turn off and "Quick Freezing" blinking?
   • YES: Break of FCC thermistor. Poor connection between FCC thermistor and IC1 on PCB. Abnormal spec of DFC thermistor (resistor of thermistor is bigger, e.g., 5.9~6.5KΩ at 0°C).
   • NO: Proceed to step 5.
6. Does "Energy Saving" turn off and "Quick Freezing" turn on?
   • YES: Proceed to step 6.
   • NO: Short of DFC thermistor. Poor connection between DFC thermistor and IC1 on PCB.
7. Does thermal fuse blow out?
   • YES: Break of DFC thermistor. Poor connection between FCC thermistor and IC1 on PCB.
   • NO: Proceed to step 7.
8. Does "Energy Saving" turn on and "Quick Freezing" turn off?
   • YES: Proceed to step 8.
   • NO: Break of DFC thermistor. Defect of PCB (e.g., defect of relay).
9. Does thermal fuse blow out?
   • YES: Thermal fuse blows. Abnormal spec of DFC thermistor (when resistor of thermistor is bigger, e.g., 6.1~6.7KΩ at 0°C, there is some case to blow thermal fuse out due to becoming defrost time longer).
   • NO: Proceed to step 9.
10. Does "Energy Saving" and "Quick Freezing" blink?
    • YES: Defect of communication circuit and EEPROM circuit of control PCB. Plug out and after 7 minutes plug in again.
    • NO: Proceed to step 10.
11. Does frost adhere to evaporator much?
    • YES: Gap of door. Defect of control PCB.
    • NO: Proceed to step 11.
12. Does the "Energy Saving" turn off, "Quick Freezing" turn off and "Freezer Control" LED "MAX" blinking?
    • YES: Gas leakage at high pressure side. Poor compression. Defect of Control PCB.
    • NO: Proceed to step 12.
13. Does "Energy Saving" turn off, "Quick Freezing" turn off and "Freezer Control" LED “MIN” blinking?
    • YES: Gas leakage at low pressure side. Defect of Control PCB.
    • NO: (No further steps indicated, implies resolution or unlisted issue)

9. Schematic Diagram

This section provides wiring connection diagrams for the refrigerator models. These diagrams illustrate the electrical connections between various components such as the lamp, running capacitor, starting relay, motor, motor protector, defrost heater, temperature fuse, fan motor, and control boards (Base Control, DFC, FCC).

9.1 Wiring Connection: NR-BW414MN, NR-BW414SS, SN, SW

This diagram shows the wiring connections for the NR-BW414MN, NR-BW414SS, SN, and SW models, operating at 220V - 240V / 50Hz. Key components include the lamp, door switch, running capacitor, starting relay, motor, motor protector, defrost heater, temperature fuse, fan motor, and connections to the base control board (CON 1, CON 202, CON 203) including DFC and FCC sensors.

9.2 Wiring Connection: NR-BW414VS, NR-BW414XN, NR-BW464VS, NR-BW464XN

This diagram shows the wiring connections for the NR-BW414VS, NR-BW414XN, NR-BW464VS, and NR-BW464XN models, operating at 220V - 240V / 50Hz. Key components include the reactor, motor protector, motor (U, V, W phases), fan motor, PC door switch, FC door switch, and connections to the base board (CON1, CON2, CONS) and door control. Various color-coded wires (brown, blue, green, white, black, gray, yellow, orange, purple, red) are indicated for connections.

10. Disassembly Instruction

10.1 Cover Control

To remove the cover control:

1. Use a screwdriver to insert into the lock hole between the PC Door Complete and Cover Control, then push it loose.
2. Use another hand to lift it up slowly.

10.2 PAS Control

To remove the PAS Control:

1. Use a screwdriver to insert into the hook of the Cover Control and push it up.
2. After loosening the PAS Control at the first hook, use a screwdriver to push at the next hook.
3. While pushing the hook, use another hand to pull the PAS Control up.

11. Repairing Procedure

Solving FC door over lab

This procedure addresses issues where the FC door protrudes. The specification for protrusion is not more than 1.0 mm.

1. Check if the FC door protrudes out with the PC door.
2. To adjust, take off the 2 screws of the hinge bottom.
3. Add shim size 1 mm with the hinge bottom and re-assemble to the FC Door.
   • Note 1: Add 2 pcs of shim if FC Door over lab is actual 1.5~3.0 mm.
   • Note 2: Add 3 pcs of shim if FC Door over lab is actual more than 3.0 mm.
4. Check both PC and FC door alignment to ensure it is "OK".

12. Technical Information

12.1 NR-BW414MN, NR-BW414SS, SN, SW (Non Inverter)

• PC Cooling not enough / Ice forming

1. Symptom of the problem: PC cooling is insufficient due to ice forming.

2. Cause: The fan motor does not work due to ice forming, causing it to get stuck in the fan motor area. This prevents the fan motor from blowing cold air, leading to insufficient PC temperature.

3. Detail of countermeasure / TI No.: REF 12-01
To protect against ice-forming in fan motor areas, perform the following modifications:

1. Add a new insulation plate (Kit Part No. WS-08x100x250MM, 1 pc) to the INS rear of the cover coil.
2. Add another new insulation plate (Kit Part No. WS-08x100x250MM, 1 pc) to the rear side of the coil EVP.
3. Add a deflector (Part No. BF161020, 1 pc) to the tube of the coil EVP.
4. Replace the Pas-control (Part No. CNRBG-166465).

Refer to pages 21-22 for detailed instructions on how to modify the countermeasure in the field.

4. Description part addition / compatibility

5. Instruction of the modification in your field

• Estimate cause: Circulated air from the PC does not pass into the evaporator but only on its surface. Therefore, the circulated air does not become dried. The circulated air from the FC is provided with humidity and comes out in the fan motor area. This area is very cold, causing humidity in the circulated air to become ice and form ice.

Countermeasure No. 1: To add insulation plate 2 pcs on cover coil and inner liner.

• 1.1 To add insulation on rear of cover coil: Place insulation on the rear of the cover coil.
• 1.2 To add insulation on inner liner: Remove the deflector at the tube coil (1 pc). Remove the screw of the support coil. Remove the coil EVP from the support coil. Add insulation on the rear of the Cover coil. Make a few holes before re-assembling the support coil. Assemble the support coil to the inner liner. Add 1 pc of cable tie and lock it with the tube of the coil EVP.

Countermeasure No. 2: To add one deflector.

• 2.1 To add one deflector: Add deflector (Part No. BF161020, 1 pc). Note: Dimension may not be the same as the master.

Countermeasure No. 3: Pas control CNRBG-166465 replace.

• 3.1 Pas control CNRBG-166465 replace: Replace the new PCB control (with circle marking on top of Capacitor spec 450V).

6. Manual defrosting information

1. Remove AL. foil tape.
2. Short circuit J1 & J2. The heater defrost will turn on.
3. After ice forming is cleaned, the compressor and fan motor will operate.

7. After assembling the part to the unit, check whether the function is OK as follows:

1. Lamp is on.
2. Compressor is working.
3. Fan motor is on and working.

12.2 NR-BW414VS, NR-BW414XN, NR-BW464VS, NR-BW464XN (Inverter)

• PC Cooling not enough / Ice forming

1. Symptom of the problem: PC less cooling.

2. Cause: The fan motor does not work due to ice forming, causing it to get stuck in the fan motor area. This prevents the fan motor from blowing cold air, leading to insufficient PC temperature.

3. Detail of countermeasure / TI No.: REF 12-02
To protect against ice-forming in fan motor areas, perform the following modifications:

1. Add a new insulation plate (Kit Part No. WS-08x100x250MM, 1 pc) to the INS. rear of the cover coil.
2. Add another new insulation plate (Kit Part No. WS-08x100x250MM, 1 pc) to the rear side of the coil EVP.
3. Add a deflector (Part No. BF161020, 1 pc) to the tube of the coil EVP.
4. Replace the Pas-control (Part No. CNRBG-170061).

Refer to pages 24-26 for detailed instructions on how to modify the countermeasure in the field.

4. Description part addition / compatibility

5. Instruction of the modification in your field

• Estimate cause: Circulated air from the PC does not pass into the evaporator but only on its surface. Therefore, the circulated air does not become dried. The circulated air from the FC is provided with humidity and comes out in the fan motor area. This area is very cold, causing humidity in the circulated air to become ice and form ice.

Countermeasure No. 1: To add insulation plate 2 pcs on cover coil and inner liner.

• 1.1 To add insulation on rear of cover coil: Place insulation on the rear of the cover coil.
• 1.2 To add insulation on inner liner: Remove the deflector at the tube coil (1 pc). Remove the screw of the support coil. Remove the coil EVP. Add insulation plate to the rear of the Coil EVP. Make a few holes before re-assembling the support coil. Assemble the support coil to the inner liner. Add 1 pc of cable tie and lock it with the tube of the coil EVP.

Countermeasure No. 2: To add one deflector.

• 2.1 To add one deflector: Add deflector (Part No. BF161020, 1 pc). Note: Dimension may not be the same as the master.

Countermeasure No. 3: Pas B41MV4 (Control) to replace.

• 3.1 Pas B41MV4 (Control) to replace: Replace the new PCB (Mark F05).

6. Manual defrosting information

1. Defrost mode based on basic instructions (Refer to next page 26).
2. After ice forming is cleaned, the compressor and fan motor will operate.

7. After assembling the part to the unit, check whether the function is OK as follows:

1. Lamp is on.
2. Compressor is working.
3. Fan motor is on and working.

• Defrost mode demo checking guide.

1. Open PC & FC door.
2. Push "Freezer Control" 1 time. Then release your finger.
3. Push "Quick Freezing" 1 time. Then release your finger.
4. Push "Freezer Control" 1 time. Then release your finger.
5. Push "Freezer Control" hold to 5 sec. Then release your finger.
6. Close both PC & FC door.
7. Push "Quick Freezing" 1 time. Then release your finger. (Blue light LED turns on).
8. Then check if the compressor stops and heater defrost functions.

13. Parts Exploded View and Replacement Parts List

13.1 Parts Exploded View: Body

This section provides an exploded view diagram of the refrigerator's body components, illustrating the assembly and individual parts. It includes various internal and external parts such as shelves, drawers, and structural elements. For a detailed list of parts, refer to the Replacement Parts List.

13.2 Parts Exploded View: Door

This section provides an exploded view diagram of the refrigerator's door components, illustrating the assembly and individual parts. It includes door shelves, gaskets, and other door-related mechanisms. For a detailed list of parts, refer to the Replacement Parts List.

13.3 Parts Exploded View: Packing

This section provides an exploded view diagram of the refrigerator's packing materials, including foam pads, plastic covers, and paper protectors, used for safe transportation. It also indicates the location of the sticker barcode and packing belt.

13.4 Replacement Part List

This comprehensive list details all replacement parts for the NR-BW414MN, SS, SN, SW / NR-BW414VS, XN / NR-BW464VS, XN refrigerator models. It includes part numbers, safety designations, and quantities for each model variant. Due to the extensive nature of this list, only a summary of part categories is provided below. The full detailed list is available in the original service manual.

The full parts list covers various components including covers, hinges, lamps, ducts, trays, crispers, chilled cases, door switches, labels, control boards, compressors, fan motors, sensors, heaters, and packing materials. Specific part numbers and applicability vary by model and destination.

Detail Change Notice

This section outlines revisions made to the service manual over time, including updates to part numbers, model information, and technical instructions.