LG Oven Error Code F9: Bake Igniter Not Lighting

The Logic Verdict

Scott “The Fix It Guy” demonstrates a rare LG layout where the bake burner stands vertically behind the convection fan. His F9 oven had gas but no flame because the rear igniter had aged out and could no longer draw enough current to open the safety valve. After unplugging the range, he popped the door off, pulled the racks, removed the two-piece fan cover, clipped in a new flat igniter with the porcelain wire nuts that ship in the box, and confirmed the flame ignited within 30 seconds. Once the oven hit 350°F again, F9 cleared automatically.

What It Means

F9 = the control never saw the oven pass its preheat target. On gas models that usually means the bake igniter never got hot enough to open the gas valve, so cavity temperature stalls near room temp and the control faults out.

Common Causes

• Weak flat igniter. After a few years the glow bar only pulls 2–2.5 amps and the safety valve never opens, so the oven times out with F9.
• Damaged ignition wiring. The harness that runs through the rear firewall can fray when the panel is removed, leaving the igniter open.
• Loose high-heat wire nuts. If the porcelain connectors aren’t tight, the igniter never gets full voltage.
• Stuck relay or power surge. Occasionally the board latches; a full power reset is a quick first check before replacing hardware.

Step-by-Step Fix

1. Kill power and silence the code. Press Clear/Off, unplug the range, and pull it forward just enough to reach the outlet.
2. Remove the door and racks (optional but easier). Flip the hinge latches up, lift the door straight off, and slide the racks out so the rear cover is accessible.
3. Pull the two rear panels. Use a #2 Phillips to remove the screws around the convection cover, lift it off, then remove the inner burner shield to expose the vertical burner tube and igniter.
4. Swap the igniter. Remove the single screw holding the old igniter, lift it off the bracket, cut the original leads, and strip about 1/4” of insulation. Connect the new igniter leads to the oven wires using the supplied porcelain wire nuts—polarity doesn’t matter. Tuck the connections back into the firewall so they don’t touch the fan blade.
5. Reassemble and test. Reinstall both panels, slide the racks back in, and set the door back onto the hinges. Restore power, start a 350°F bake cycle, and watch through the window—the igniter should glow bright orange and you should hear the burner ignite within 30 seconds. Let the oven climb past 150°F to clear F9.

Parts & Tools

• Supplying Demand 5303935066 flat oven igniter (drop-in replacement for LG’s rear glow bar)
• Klein 11055 wire stripper (makes clean 1/4” pigtails inside the oven cavity)

Resources