LG LSWS306ST Service Manual page 54

Range Of resistance
Resistance[Ω]
Heater
Approximately
Inner Broil 22.5
Outer Broil 36.9
Bake 22.5
Convection 27.9
Yes
Plug in the unit
3
Is the value of thermistor
normal? (Refer below)
Check with the test mode
To enter the test mode, follow
these steps:
(1) Press the any button
(2) Press the OVEN LIGHT and turn Right Time &
Temp Encoder at the same time
(3) Press the OVEN LIGHT and turn right Time &
Temp Encoder again.
(4) press the COOK TIME button
Normal: Thermistor value at room temp is from 70℉
to 90℉
No
TROUBLESHOOTING
Yes Go to No 5
Current temp
Unplug the unit
4
Is the resistance of
thermistor normal?
Check:
Pins 4 and 5 of CN32 in main PCB
Normal- approximately 1.09kΩ at 25℃
Yes
5
Replace the Relay PCB.
If the unit does NOT work even though the
Relay PCB in changed,
you should replace
the Main PCB
7-8
Replace the
No
defective
Thermistor
CN32