Direct answer: If the bottom of your LG oven is not heating, the most common causes are a failed oven bake element on electric models, a weak oven igniter on gas models, or a heating pattern that only looks wrong because the bake element cycles off while the broil element helps preheat.
Most likely: Start by confirming whether the oven actually fails to bake food or whether you just do not see the lower heat source glowing. On many ovens, the bottom heat is hidden or cycles on and off, so the real clue is poor baking performance, long preheat times, or no temperature rise.
Separate the lookalikes first. If the oven reaches temperature and food bakes normally, you may be chasing a normal cycle pattern. If preheat drags, the cavity stays lukewarm, or the top browns while the bottom stays pale, check the lower heat source next. Reality check: a lot of homeowners never actually see the bake heat source because it sits under the oven floor. Common wrong move: replacing parts just because the broil element still works.
Don’t start with: Do not start by ordering a control board. Controls are possible, but they are not the first bet when the lower heat is missing.
The oven cavity barely warms in bake mode, or it never gets close to set temperature.
Start here: Start by confirming whether the oven is electric or gas, then watch what the lower heat source does during the first few minutes of bake.
The top element or top burner heats, but baking is weak or absent.
Start here: This points more toward the oven bake element or oven igniter than the control.
The display climbs slowly, food cooks unevenly, and the bottom of baked items stays pale.
Start here: Check for a weak lower heat source first, then consider the oven temperature sensor if the heat source is working but temperatures are off.
The oven seems normal otherwise, but you expected to see heat from the floor.
Start here: Do not assume failure yet. Many ovens hide the bake source or cycle it, so verify with actual baking performance and temperature rise.
Many ovens do not show a steady glowing lower heat source. Some hide the bake element under the oven floor, and many cycle bake and broil during preheat.
Quick check: Run bake from a cold start and watch for real temperature rise over 10 to 15 minutes instead of looking only for a visible glow.
If broil still works but bake does not, the lower heating element is the most common failure. It may be blistered, split, or simply stay cold.
Quick check: Look for bright spots, cracks, bubbling, or a section that never heats while the oven is calling for bake.
A gas oven igniter can glow and still be too weak to open the gas valve properly. That gives you slow preheat, little bottom heat, or no bake flame.
Quick check: Start bake and listen after the igniter glows. If it glows for a long time with no strong burner flame, the oven igniter is a strong suspect.
If the lower heat source does come on but temperatures are still off, the oven may be reading wrong or losing too much heat at the door.
Quick check: Check whether the oven overshoots or undershoots badly and inspect the oven door gasket for gaps, tears, or flattened sections.
A lot of ovens look like the bottom is not heating when they are really cycling normally or using a hidden bake source.
Next move: If the oven heats normally and food bakes evenly, the lower heat source is probably cycling as designed or hidden from view. If the cavity stays cool, preheat is extremely slow, or there is no real lower heat, move to the bake-source check.
What to conclude: This separates a normal-looking oven from one that truly has a bake-side heating failure.
Electric and gas ovens fail differently, and the clues are usually obvious once you watch the bake cycle.
Next move: If you find a visibly damaged electric bake element or a gas igniter that glows without bringing strong flame, you likely found the problem. If the bake source looks and acts normal but the oven still bakes poorly, check temperature sensing and heat loss next.
What to conclude: A dead oven bake element or weak oven igniter is the most likely repair path when the lower heat is truly missing.
If the lower heat source runs but baking is still off, the oven may be shutting down too early or leaking heat faster than it should.
Next move: If the gasket is clearly leaking or the sensor is visibly damaged or loose, that gives you a cleaner repair direction. If the sensor and seal look fine and the bake source still acts wrong, the problem may be in wiring or the oven control circuit.
Once the symptom matches a specific component, replacing the right oven part is usually more effective than chasing the control.
Next move: If preheat time returns to normal and the oven bakes evenly again, the repair path was correct. If the same symptom remains after a clearly supported part replacement, stop before buying more parts and move to wiring or control diagnosis with a pro.
A quick heat test is not enough. You want to know whether the oven now preheats and bakes the way it should.
A good result: You are done when preheat is normal, the cavity holds temperature, and food browns from the bottom the way it should.
If not: If the oven still will not bake correctly, the remaining likely causes are wiring, relay failure, or a gas-valve issue that needs proper testing.
What to conclude: A successful bake test confirms the repair. A failed bake test after the common checks means the next step is targeted electrical or gas diagnosis, not more guesswork.
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That usually points to the bake side, not the broil side. On an electric oven, the oven bake element is the first suspect. On a gas oven, a weak oven igniter is very common. If the top still heats but baking is poor, start there before blaming the control.
Sometimes, yes. Many ovens hide the bake element under the oven floor, and even exposed elements cycle on and off. The better test is whether the oven actually preheats and bakes properly, not whether you see a constant glow.
Yes. A gas oven igniter can glow and still be too weak to open the gas valve reliably. That is a classic cause of slow preheat, weak bottom heat, or no bake flame even though the igniter lights up.
Not first. Control problems do happen, but they are less common than a failed oven bake element, weak oven igniter, bad oven temperature sensor, or a major door-seal problem. Rule out the obvious heating parts before going after the control.
Yes, especially if the oven already has marginal bake performance. A leaking oven door gasket lets heat escape, stretches preheat time, and can leave the bottom of food underdone. It is not the most common cause, but it is worth checking when the heat source still runs.
If a clearly failed bake element, igniter, sensor, or gasket has been replaced and the symptom stays the same, stop buying parts. The next likely issues are burnt wiring, relay failure in the oven control, or a gas-valve circuit problem that needs proper testing.