Lg oven not heating up: see brand-specific guide above.
When I show up to an LG oven that won't heat, it's usually one of three things: the bake element burned out, the oven temp sensor failed, or the thermal fuse blew. Ignore it long enough and you're looking at a permanently cold oven plus possible control board damage from thermal runaway. Most repairs run $80-200 in parts and a couple hours of your Saturday.
OK so LG ovens are a little different from your typical range. Their ProBake models hide the main convection element behind the rear wall instead of on the bottom, which means if your oven's dead in ProBake mode but seems fine otherwise, that rear element is probably cooked. Repair costs usually land between $80-250 depending on what failed. I've replaced a ton of these elements in the last year alone.
Most Likely Causes
Based on aggregated repair data, here is the probability breakdown for this error code:
Primary cause35%
Element/igniter25%
Control/sensor15%
Power/gas15%
Other10%
Symptoms You May Notice
You set the oven to 350 and walk back 20 minutes later and it's barely warm in there. Like, you can stick your hand in comfortably. That's not a calibration issue, something's actually not generating heat.
The broiler works fine but bake mode produces nothing. Or vice versa. Different elements for different modes, so when one works and the other doesn't, you've basically already narrowed it down.
On gas models, you hear the igniter clicking repeatedly but no flame lights, or the igniter glows orange for a long time, way longer than 30-40 seconds, before the burner finally catches, if it catches at all.
The oven display shows F9 or occasionally F19 before, during, or right after you try to start a bake cycle.
Oven's completely dead, no heat whatsoever, but the clock and control panel lights still work fine. That usually points to a thermal fuse or a tripped leg on the 240V breaker rather than a control board issue.
Can you reset a Lg oven to clear the NOT-HEATING code?
Unplug the LG range from the wall outlet completely. Wait a full 5 minutes, not just 60 seconds, because the control board on LG ovens takes longer to fully discharge. Plug it back in, let the display come back up, then try a bake cycle at 350 degrees. If an F9 or F19 error comes right back, the underlying hardware issue is still there and a reset won't fix it.
Tools Required for Diagnosis
Phillips #2 screwdriverFlathead screwdriverDigital multimeterNeedle-nose pliersFlashlight or headlampNut driver set (1/4" and 5/16")Work gloves
Diagnostic Checklist
Follow these steps in order. We start with the easiest external fixes before opening up the machine.
ComponentComponent Under Test
Expected Range1080–1100 ohms
ConditionIf Open (OL) or infinite, replace component.
Frequently Asked Questions
How much does it cost to fix an LG oven that's not heating?
Depends on what failed. A bake element is usually $30-60 in parts and about an hour of your time. Oven temp sensor is $20-30. Thermal fuse is $5-15. Gas igniter runs $40-80 for the part. Now if you're calling a tech to do it, add $100-150 in labor on top of that. Control board replacement is where it gets expensive, $150-300 for the board plus labor, and at that point you gotta weigh it against how old the oven is. Rule of thumb: if the repair is under 50% of what a new range costs, fix it.
My LG oven shows F9 and won't heat. What does that mean?
F9 on LG ovens is an oven sensor fault. The control board is seeing a reading from the temperature sensor that's out of range, either too high, too low, or completely open. First thing to do is check the sensor's wiring harness for obvious damage or a loose connector at the back of the oven cavity. If the wiring looks fine, test the sensor with a multimeter. Should read 1080-1100 ohms at room temp. If it's off, replace the sensor. It's one of the cheaper fixes in the oven world, usually under $30 in parts.
Why does my LG ProBake oven heat on broil but not bake?
Broil element is up top, bake element is either on the bottom or, on ProBake models, behind the rear wall. They're completely separate components. If broil works and bake doesn't, you've basically already diagnosed it. The bake element is out. Or on ProBake models, that rear convection element failed. Pull the bake element and test it with a multimeter. Should show 15-50 ohms. Open circuit means it's toast. Pretty straightforward repair once you've confirmed it.
Can I replace the bake element myself or do I need a tech?
Honestly, replacing a bake element is one of the easier appliance repairs out there. You unplug the range, remove two screws holding the element to the back of the oven cavity, pull it forward, disconnect the two wires, plug in the new one, reverse the process. Takes maybe 30-45 minutes if you've never done it before. The only thing that trips people up is not knowing which wire goes where, so snap a quick photo before you disconnect anything. Gas igniter replacement is similarly DIY-friendly if you're comfortable with basic tools and following instructions.
Does the self-clean cycle damage LG ovens?
It can, yeah. Self-clean runs the oven at extremely high temperatures, like 800-900 degrees, for a couple hours. That's brutal on the bake element and the thermal fuse. I see a noticeable spike in element failures right after people run self-clean. If your LG is older and you haven't cleaned it in a while, consider oven cleaner the old-fashioned way instead. Lower temps, less stress on the components. And if you do run self-clean, don't leave the house. Stuff goes wrong during that cycle more often than people realize.
How do I know if it's the control board and not the element?
Control board failure usually shows up as weird behavior beyond just not heating. Things like random error codes cycling through on their own, buttons not responding, the display flickering, or the oven randomly turning on or off by itself. If your oven just stopped heating and doesn't do any of that weird stuff, check the element, sensor, and thermal fuse first. Those are way more common and way cheaper. The control board is the last resort diagnosis, not the first guess. I'd say 80% of no-heat calls I go on are elements or igniters, not boards.
Models Known to Experience NOT-HEATING Errors
This repair applies to most Lg ovens with this error code. Common model numbers include: