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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.
3.
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
1
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
2
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
3
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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