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REFRIGERATOR

Service manual

NO FROST

MODEL:PRN438HW/S & PRN520HW/S

NOTE: product specifications are subject to change.

■Parts Description

■Circuit diagram

■Cooling diagram

■The guide for Disassembly Common parts of Refrigerator

◆The instruction of replacing the main board.

1. The location of the

electrical main board.

2. Unscrew electrical

box cover ( 2 screws ).

3. Remove the

electrical cover.

4. Tidy up the electrical

wires.

5. Unplug the electrical

wires and remove the

screw fixing the main

board.

◆The instruction of of replacing display board.

1. The locat ion of the

display board.

2. Remove the display

cover.

3. Unplug the electrical

wires and remove the

screws fixing the

display board.

4. Replace the new

display board.

◆The instruction of of replacing fan motor.

1. Remove the fan the

shelf part.

2. Unscrew two screws

of the wind channel

part in freezer

chamber.

3. Remove the wind

channel part in freezer

chamber.

4. Unplug the electrical

wires and remove the

fan motor part.

5. Unscrew the fixing

screws of the fan motor

and replace it.

◆The instruction of replacing refrigerator lamp.

1. The locat ion of the

refrigerator lamp.

2. Remove the lamp

cover and unscrew the

one screw then take

out the lamp.

◆The instruction of replacing Door switch.

1. The location of the

door switch.

2. Take out of the door

switch.

◆The instruction of replacing PTC Starting relay and Overload protector.

1. The location of the

PTC Starting relay and

Overload protector.

2. Take down Spring

Tap and Cover.

Disconnect the

connect ing wire of the

PTC Starting relay and

Overload protector.

■TROUBLESHOOTING

◆The solution for digital display code problem:

No. Problems analysis Solutions

The D1 digital display

flashing when open the

refrigerator door.

1. The refrigerator chamber

Tem. Sensor is open circuit or

short circuit.

2. The refrigerator chamber

Tem. Sensor is bad.

3. The control PCB is bad.

1. Using a Multimeter with the

ohm switch to measure the

resistor of sensor or checking the

connect ing is well or not.

2. Change the sensor

3. Change the control PCB

The D2 digital display

flashing when open the

refrigerator door.

1. The freezer chamber Tem.

Sensor is open circuit or short

circuit.

2. The freezer chamber Tem.

Sensor is bad.

3. The control PCB is bad.

1. Using a Multimeter with the

ohm

switch to measure the

resistor of sensor or checking the

connect ing is well or not.

2. Change the sensor

3. Change the control PCB

The D3 digital display

flashing when open the

refrigerator door.

1. The Evaporator Defrost

Sensor is open circuit or short

circuit.

2. The Evaporator Defrost

Sensor is bad.

3. The control PCB is bad.

1. Using a Multimeter with the

ohm switch to measure the

resistor of sensor or checking the

connect ing is well or not.

2. Change the sensor

3. Change the control PCB

4 The

D3 digital display

flashing when passing key.

1. The electrical wire between

the control and display PCB is

open circuit or short circuit.

2. The display PCB is bad.

3. The control PCB is bad.

1. Using a Multimeter with the

ohm switch to measure the

resistor of electrical wire or

checking the connecting is well or

not.

2. Change the display PCB

3. Change the control PCB

D1 digital display D2 digital display D3 digital display D4 digital display

◆The common problem judgement method

Problem Cause

Refrigerator can’t start

1.1 Is the power cord connecting well？

1.2 Is the power voltage too low？

1.3 Is the sensor irrational setting?

1.4 Is the ambient temperature too low?

1.5 Is the circuit on power?

1.6 Is there some default in compressor

1.7 Is the refrigeration system blocked by ice or dirty, please stop the unit and restart

after 10 minutes to see if the compressor can start.

Weak cooling effects

2.1 Is there any heat source around the refrigerator?

2.2 Is there enough space around the refrigerator for reject ion of heat?

2.3 Is the setting of the temperature appropriate?

2.4 Is there too much food or overheating food in it?

2.5 Does there open the door frequently?

2.6 Is the door completely closed?

2.7 Does the gasket destroyed or distort?

2.8 Does the gas leak?

The unit can not stop

running

3.1 Is there any heat source around the refrigerator?

3.2 Is there enough space around the refrigerator for reject ion of heat?

3.3 Is the setting of the temperature appropriate?

3.4 Is there too much food or overheating food in it?

3.5 Does there open the door frequently?

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