LG GR-L247ER Service Manual ▷ View online
TROUBLE DIAGNOSIS
- 85 -
Problems
Symptom
Causes
Checks
Measures
Remarks
Bad defrost.
Defrost is not
Defrost lead wire is cut.
Check if defrost lead wire is cut with a
Reconnect Lead
working.
tester.
Wire.
Defective defrost driving relay.
Check the voltage of CON5 (1 and 7)
Replace relay (RY 7
Refer to load
with a tester after pressing main
and RY 14) or PCB.
driving conditions
PCB test switch twice.
check in circuit
If the voltage is normal then it is OK.
explanation.
Defective defrost sensor parts.
Check the resistance of defrost sensor
Replace defrost
Refer to sensor
with a tester.
sensor.
resistance
characteristic
table of circuit
explanation.
Defective
Buzzer
Defective connecting lead wire from
Check lead wire related to door
Repair lead wire.
buzzer
continuously
main PCB to door switch.
switch with a tester.
rings or door
Defective door switch parts.
Refer to door switch in parts repair
Replace door switch.
opening alarm
guide.
does not work.
Defective
Buzzer does
Key input wire is cut or bad connector
Check input wire with a tester.
Reconnect lead
Refer to display
display button
not ring and
terminal contact in main PCB and
wire and replace or
circuit in circuit
key does not
display PCB connecting lead wire.
directly connect bad
explanation.
sense even
contact terminal to
button is
lead wire.
pressed.
Key is continuously depressed due to
Disassemble frame display and confirm
Adjust or replace
structural interference.
visually.
interfering
structures.
TROUBLE DIAGNOSIS
- 86 -
Problems
Symptom
Causes
Checks
Measures
Remarks
Defective
Buzzer rings
Trouble mode indication.
Check trouble diagnosis function.
Repair troubles
Refer to mode
display button.
but key does
indication in
not sense even
function
button is
explanations.
pressed.
Door Buzzer
Buzzer
Defective connecting lead wire from
Check lead wire associated with door
Repair lead wire.
Check model
continuously
main PCB to door switch.
switch.
with dispenser.
rings or door
Defective freezer compartment door
Refer to door switch in parts repair
Replace Freezer
opening alarm
switch parts.
guide.
compartment door
does not work.
switch.
Bad water/ice
Ice and water
Defective connecting lead wire from
Check Lead Wire associated with lever
Repair lead wire.
dispenser.
are not
Main PCB to lever switch.
switch with a tester.
dispensed.
Defective lever switch parts
Refer to door switch in parts repair guide.
Replace lever switch.
Defective photo coupler IC parts.
Check voltage change at photo coupler
Replace photo
output terminals with lever switch
coupler IC or PCB.
pressed. It is OK if voltage change is
between 0V - 5V.
Defective relay associated with ice
Check relay (RY9, RY11, RY12)
Replace defective
dispense (geared motor, cube and
with a tester.
relay.
dispenser solenoid).
Defective parts associated with ice
Check resistance of parts with a tester.
Replace defective
dispense (geared motor, cube and
parts.
dispenser solenoid).
Defective relay associated with water
Check relay (RY10) with a tester
Replace defective
dispense.
relay.
Defective parts associated with water
Check resistance of parts with a tester.
Replace defective
dispenser.
parts.
2-3. Temperature
- 71 -
Problems
Causes
Checks
Measures
Remarks
High
Poor cool air circulation due to faulty
- Lock –– Check resistance with a
- Replace fan motor.
temperature
fan motor.
tester.
in the freezer
0
Ω
: short.
compartment.
∞Ω
: cut.
- Reconnect and reinsert.
- Rotate rotor manually and check
rotation.
- Wire is cut.
- Bad terminal contact: Check
- Maintain clearance and remove ice
terminal visually.
(Repair and/or replace shroud if fan
- Fan constraint. – Fan shroud
is constrained by shroud
contact: Confirm
deformation).
visually.
– Fan icing:
Confirm visually.
Faulty fan motor due to faulty door
- Iced button (faulty) operation:
- Confirm icing causes and repair.
switch operation.
Press button to check
- Replace door switch.
- Faulty button pressure and contact:
Press button to check operation.
- Door cannot press door switch
- Door sag: fix door.
button: Check visually.
- Door liner bent:replace door or
attach sheets.
Bad radiation conditions in
- Check the clearance between the
- Keep clearance between
- The fan may be
compressor compartment.
refrigerator and wall (50 mm in
refrigerator and walls (minimum
broken if cleaning
minimum).
50mm).
performs while the
- Check dust on the grill in
- Remove dust and contaminants
refrigerator is on.
compressor compartment.
from grill for easy heat radiation.
- Check dust on the coils condenser.
- Remove the dust with vacuum
cleaner from the coils condenser
while the refrigerator is off.
2-4. Cooling
- 72 -
Problems
Causes
Checks
Measures
Remarks
High
Refrigerant leak.
Check sequence
Weld the leaking part, recharge the
Drier must be replaced.
temperature
1. Check the welded parts of the
refrigerant.
in the freezer
drier inlet and outlet and drier
compartment.
auxiliary in the compressor
compartment (high pressure side).
2. Check the end of compressor
sealing pipe (low pressure side).
3. Check silver soldered parts.
(Cu + Fe / Fe + Fe).
4. Check bending area of wire
condenser pipe in compressor
compartment (cracks can
happen during bending).
5. Check other parts (compressor
compartment and evaporators in
freezer compartment).
Shortage of refrigerant.
Check frost formation on the surface
- Find out the leaking area, repair,
Drier must be replaced.
of evaporator in the freezer
evacuate, and recharge the
compartment.
refrigerant.
- If the frost forms evenly on the
- No leaking, remove the remaining
surface, it is OK.
refrigerant, and recharge new
- If it does not, it is not good.
refrigerant.
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