Sensing Fail, F1, F2 - LG LRE3085ST Service Manual

CHECKING FLOW CHART BY FAILURE

Sensing Fail, F1, F2?

Unplugged the unit
1
Is the Connector
disconnected or loose?
1. Sensor connection
2. CN13 of Main PCB
No
2
Is the resistance of
thermistor normal?
Check:
Pins 1and 2 of CN13 wiring in main PCB
Normal- approximately 1.09kΩ at 25˚C
Reconnect
Yes
or adjust the
connection
Sensor
connection
CN13
connection
Replace the
No
defected
thermistor
CN13
Yes
Plug the unit
3
Is the value of thermistor
normal?
Check with the test mode
To enter the test mode, follow these steps:
1. press the "clear" key
2. press the "BAKE", "BROIL" button
at the same time
3. press the "BAKE", "BROIL" button
at the same time again.
Software version is displayed at the left digits.
4. press the NUM "3" button
Normal : the sensor value is from 70˚F
to 90 at room temp.
˚F
4
Replace the Main PCB.
9-18
Yes
Go to No 1
No