LG Oven Running Too Hot: Causes & Fix

An LG oven that runs hotter than its setpoint usually comes down to a temperature sensor reading low, a welded element relay on the control board, or a calibration offset left in the wrong direction. On ProBake Convection models the sensor sits close to the rear element, which makes it especially prone to misreading the true cavity temperature. An oven that keeps heating after you press Off is the one case to treat as an emergency.

How LG's Temperature Control Behaves#

LG ovens run a closed loop: the Electronic Range Control reads an NTC sensor, compares it to your setpoint, and cycles the elements to hold target. That sensor lives in a rear corner of the cavity, and on ProBake Convection models it sits near the rear element — close enough that it can react to the element's direct heat faster than to the overall cavity temperature. Understanding this quirk matters, because several "too hot" complaints on LG ovens are really the sensor being misled about what the cavity is actually doing.

Start With Calibration (20% of cases)#

Before opening anything, rule out a bad calibration offset. LG ranges allow roughly plus or minus 35°F of calibration, and if a previous user or technician dialed it the wrong way, the oven runs hot by exactly that much. Hold the Bake button for about five seconds (on some models it is a Settings or Options button), and the display shows the current offset. Set it to zero, then test with an independent thermometer in the cavity center. If the oven still runs, say, 15°F hot at a zero offset, set the calibration to negative 15°F and retest. This costs nothing and fixes a fifth of cases outright.

Temperature Sensor Reading Low (35% of cases)#

The most common real fault is a sensor whose resistance has drifted low, so it reports a cooler cavity than exists and the board keeps firing elements past the true setpoint. The signature is food that consistently burns and an independent thermometer showing 25 to 75°F above the set temperature across all baking modes. To test it, disconnect the sensor at the rear of the range and measure resistance at room temperature — a healthy one reads near 1,080 to 1,100 ohms, and a clearly low value (around 900 ohms at room temperature) will cause over-firing. You can also set the oven to 350°F with a thermometer inside and compare after 30 minutes: an offset of 20 to 35°F may be recalibrated out, but more than 35°F means the sensor should be replaced. It is an easy job — the sensor is inside the cavity on a single screw.

Welded Element Relay (30% of cases) — Treat as Urgent#

This is the dangerous one. The relay contacts on the control board can weld shut after years of switching heavy current, leaving an element energized continuously no matter what the temperature control commands. The oven then heats without limit until the high-limit thermostat trips or you cut power. The tells are extreme heat (reaching 550°F when set to 350°F), no response to temperature changes, an element that stays glowing after you press Clear/Off, and the smell of overheated insulation. If the oven does not stop heating when you press Off, unplug the range or switch off the breaker immediately — a welded relay is a fire hazard, and it requires control-board replacement before the oven is safe to use again, because it will re-energize the element the moment power returns.

Convection Fan Hot Spots (10% of cases)#

When the ProBake convection fan stops distributing heat from the rear element, the area right in front of that element runs much hotter than the rest of the cavity. The sensor, sitting elsewhere, reads a lower temperature and tells the board to fire harder, so food near the back wall burns while the front underheats. This shows up only in convection mode, with the overall sensor reading looking correct. Start ProBake Convection and listen at the rear for the fan; silence means it is not running, and you access it behind the rear interior panel to check the blade and test the motor.

Gasket Misreading the Sensor (5% of cases)#

If the door gasket has failed on the side where the sensor is mounted, cool room air leaking past it chills the sensor artificially. The board fires elements harder to compensate, overheating the rest of the cavity while the sensor area stays cool. Inspect the gasket for uneven wear, replace it if it is deteriorated more on one side, and confirm the sensor is not sitting directly in a draft from the gap.

Emergency Response for a Runaway Oven#

1. Turn off the range's circuit breaker immediately.
2. Open windows to ventilate the kitchen.
3. Do not open the oven door if the temperature is extreme — let it cool with the power off.
4. Do not restore power until a technician has diagnosed and repaired the control board.
5. Remember a welded relay re-engages the element the instant power comes back.

How to Prevent It#

• Use a surge protector — power spikes contribute to relay welding.
• Verify the calibration offset yearly with an independent oven thermometer.
• If the oven consistently overshoots by more than 25°F, have the sensor evaluated.
• Keep the door gasket in good shape so it cannot cool the sensor asymmetrically.
• Never ignore an oven that will not respond to Off — that is a safety emergency, not a quirk.

When to Call a Professional#

Zeroing the calibration, swapping the cavity sensor, and inspecting the gasket are all reasonable DIY jobs. A welded element relay, any control-board work, and a ProBake convection-motor replacement are better left to a technician — the board sits on a high-current circuit and a welded relay is a safety fault, not a convenience issue. Call right away if the oven ignores the Off command, reaches extreme temperatures, or smells of overheated insulation, since those point at the runaway-relay condition rather than a simple calibration drift that you can dial out yourself.

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