LG LSRG309ST Service Manual page 60

CHECKING FLOW CHART BY FAILURE
Sensing Fail, F-1, F-2?
Yes
Power Off
1
Is the disconnect or loose
connector?
1. Sensor connection
2. CN05 of Main PCB
No
Power Off
2
Is the resistance of
thermistor normal?
Check:
Pins 1and 2 of CN5 wiring in main PCB
Normal - approximately 1.09kΩ at 25˚C
Reconnect or
Yes
repair the
connector
Sensor
connection
CN05
connection
No
Replace the
failed thermistor
10-11
Yes
Power On
3
Is the value of thermistor
normal?
Check: using the test mode
To enter the testmode, follow these steps:
1. press the "clear" key
2. press the "BAKE", "BROIL" key at the same
time
3. press the "BAKE", "BROIL" key at the same
time again.
4. press the NUM "3" key
Normal : the sensor value is from 70˚F to 90˚F at 25˚C.
No
4
Replace the Main PCB. (EBR52349501)
CN5
Yes
Go to No 1