LG LWD3063BD, Service Manual, Page: 59 / 89

7-8
TROUBLESHOOTING
Plug in the unit
Range Of resistance
Heater
Resistance[Ω]
Approximately
Upper Inner Broil 22.5
Upper Outer Broil 36.9
Upper Bake 22.5
Upper Convection 27.9
※ Lower heater is same.
Yes
Go to No 5
Is the value of thermistor
normal? (Refer below)
Check with the test mode
To enter the test mode, follow
these steps:
(1) press the CLEAR button
(2) press the BAKE and BROIL buttons at the same
time.
(3) press the BAKE and BROIL buttons at the same
time again.
(4) press the NUM 3 button
Normal: Thermistor value at room temp is from 70℉
to 90℉
No
Yes
3
Current temp
Unplug the unit
Replace the
defective
Thermistor
Is the resistance of
thermistor normal?
Check:
Pins 4 and 5 of CN31 and pins 5 and 6 of
CN32 in main PCB
Normal- approximately 1.09kΩ at 25℃
Yes
No
4
CN31
CN32
5
Replace the Relay PCB.
If the unit does NOT work even though the
Relay PCB in changed,
you should replace
the Main PCB