On an LG oven, electric models that won't heat are usually a burned-out bake element or the control; gas models are almost always a weakening igniter. LG also has a display/demo mode that disables heat — worth ruling out first since it's free.
The known LG issue: LG gas igniters are a slow-fade failure — the oven takes longer and longer to heat over months, then quits. If yours has been getting slower to preheat, the igniter is almost certainly the fix.
What's actually different about a LG
Demo / display mode (check first — free) Easy
Like Samsung, LG ovens have a demo mode that lights everything but disables the heat.
What you can check: Check for a demo indicator and exit it per your model (or unplug 5 min and re-check). If it heats after, no parts needed.
Weak igniter (gas — the classic) Pro
The gas igniter glows but degrades until it can't reach the temperature needed to open the safety gas valve — glows, no flame, no heat.
What you can check: Igniter glows orange but no flame = worn igniter, an affordable common gas-oven part. A tech confirms and replaces it.
Failed bake element (electric) Pro
The lower element burns out, often with a visible break or blister.
What you can check: Inspect the bake element cold for damage; a broken one is an affordable replacement.
Control board or sensor Pro
A failed control relay won't energize the element; a bad oven sensor can block heating.
What you can check: If demo is off and the element/igniter are good, a tech tests the control and sensor.
LG oven fault codes
F9
Oven not reaching temperature in time — heating circuit / sensor
F3
Oven temperature sensor fault
Try this first: Exit demo mode if shown; otherwise unplug 5 minutes to clear a control glitch, then run a bake test.
Get the exact LG part — shipped to your door
With the $50 Quick Check, send a short video and a photo of your LG oven's model number. A real technician confirms the diagnosis and we ship you the exact part with instructions — the $50 is credited toward it. Or we walk you through the fix free.
An oven that won't come up to temperature splits cleanly by fuel type: on electric ovens it's almost always the bake element, and on gas ovens it's almost always the igniter. Both are common, affordable repairs. Here's how to tell what you're dealing with, and the safe checks first.
Safety first: For GAS ovens, do not attempt igniter or gas-valve work yourself — call a technician. For electric ovens, cut power at the breaker before inspecting anything.
Bake element (electric ovens) Moderate
The bottom heating element is the most common electric-oven failure. A failed element often has a visible blister, break, or burn spot and won't glow.
What you can check: Look at the element with the oven cool: a visible break or burn mark is a strong sign. Replacement is a straightforward repair.
Oven igniter (gas ovens) Pro
The igniter both lights the gas and tells the valve to open. As it weakens with age it glows but no longer gets hot enough to open the valve — so the oven doesn't heat. This is the #1 gas-oven failure.
What you can check: You may see the igniter glow but no flame. Do not DIY gas parts — this is a technician repair for safety.
Temperature sensor Pro
The oven's temperature sensor tells the control how hot it is. A failed sensor can cause no-heat or wildly wrong temperatures.
What you can check: Not a DIY check. Diagnosed by a technician.
Control board or thermal fuse Pro
A failed control board or a tripped thermal fuse can cut power to the heat circuit.
What you can check: Not DIY. A technician confirms and replaces.
Wrong mode or lock Easy
Delay-start, Sabbath mode, or a self-clean lock can make an oven seem dead.
What you can check: Confirm the oven isn't in a delay, lock, or self-clean cycle before assuming a failure.
Is it worth repairing?
A bake element or a gas igniter is an affordable part and a quick repair — an oven that won't heat is well worth fixing in nearly every case. Replacement only makes sense on a very old range with multiple failing systems.
Frequently asked questions
Why is my LG oven not heating?
On an LG oven, electric models that won't heat are usually a burned-out bake element or the control; gas models are almost always a weakening igniter. LG also has a display/demo mode that disables heat — worth ruling out first since it's free.
Is there a known issue with LG ovens not heating?
LG gas igniters are a slow-fade failure — the oven takes longer and longer to heat over months, then quits. If yours has been getting slower to preheat, the igniter is almost certainly the fix.
Why won't my electric oven heat up?
On an electric oven the usual culprit is a failed bake element — often with a visible blister or break. A bad temperature sensor or control board is possible but less common. The bake element is an affordable, common repair.
My gas oven igniter glows but there's no flame — why?
That's the classic sign of a weak igniter. As it ages it still glows but can no longer get hot enough to open the gas valve, so the oven never heats. The igniter needs replacing — and because it's gas, it should be done by a technician.
Is an oven that won't heat worth repairing?
Usually yes. The two most common causes — an electric bake element or a gas igniter — are inexpensive parts with quick labor.