LG LRE30453SW Service Manual page 56

Main oven sensing error
Code Error mode
F-3 Opened Sensor
F-4 Shorted Sensor
F-CODE FLOW CHART
F-3, F-4 error
Operation
Oven Thermistor remains open for over
1 min, after cook starts
Oven Thermistor is short for over 1 min
after cook starts
Main oven sensing failed
Disconnect power
Check for loose oven sensor connector.
Normal?
Check the main oven sensor
(measure the resistance after cooling down)
Normal: approximately 1.09kΩ
Normal?
Continued on the next page
No
Yes
No
Yes
7-5
Times/sampling
During cook
During cook
Reconnect
END
Replace the main oven sensor
END