Error Code F-9

No Heating — oven starting temperature does not exceed 150°F and oven temperature does not rise above starting temperature for over 5 minutes during preheating, with door closed

What This Means

Loose or disconnected wiring at Relay PCB; Failed bake or convection igniter; Gas valve (safety valve) not opening; Failed oven temperature sensor giving false low reading

How to Fix

1. 1

   Check and reconnect all wiring connectors at the Relay PCB (all tabs)

2. 2

   Check electric wiring of convection and bake igniter circuits

3. 3

   Unplug unit and measure resistance of each igniter — normal: Norton igniter 45 to 400Ω, SIC igniter 50 to 500Ω at room temperature; replace failed igniter if outside range

4. 4

   Plug in unit and enter test mode (press '4' and '6' simultaneously, select 'tO', press START) to check thermistor reading

5. 5

   Unplug unit and measure thermistor resistance at pins 5 and 6 of CN6 on Main PCB — normal is approximately 1.09 kΩ at 25°C

6. 6

   If thermistor is abnormal, replace the oven temperature sensor

7. 7

   Verify the oven gas shut-off valve is fully open

8. 8

   Check safety valve resistance — normal approximately 1 to 3Ω

9. 9

   If all components test normal but no heating, replace Relay PCB; if same issue persists, replace Main PCB

This Error Applies To

LG LSGL6337 Series Ovens & Ranges (2021) (2021–present)