What does LG Oven Heats Too Hot - Causes & Fix mean?

A failed temperature sensor or thermistor is the most common cause. Replace the sensor and verify wiring before replacing the control board.

How do I fix LG Oven Heats Too Hot - Causes & Fix?

Work through the step-by-step fix below. Start with the quick reset and the most common cause, then check the specific part this guide points to. Most fixes need only basic hand tools and the right replacement part.

Can I keep using my LG appliance with this error showing?

Usually not. LG appliances show this error when a part or safety circuit is out of range, so running it can stop the cycle or make the problem worse. Diagnose and clear the error before normal use.

What part is most commonly replaced for LG Oven Heats Too Hot - Causes & Fix?

The parts that most often fix LG Oven Heats Too Hot - Causes & Fix are listed in the parts section of this guide. Match the part to your exact model and serial number before you buy.

Is LG Oven Heats Too Hot - Causes & Fix a DIY repair or do I need a technician?

Many fixes are DIY-friendly with basic tools, such as door switches, drain pumps, water inlet valves, thermostats, heating elements, and filters. Sealed-system, refrigerant, gas, or high-voltage work should go to a licensed technician for safety.

LG Oven Heats Too Hot - Causes & Fix

LG Oven Heats Too Hot — What’s Happening

When your LG oven heats too hot, the temperature inside is climbing beyond your set point, sometimes triggering an “Oven Hot” fault if it exceeds 650°F for more than two minutes during normal cooking. LG groups this symptom with thermistor errors and upper oven heating faults (error code F9), meaning the oven’s temperature sensor or control board is not regulating heat correctly.

The result is burnt food, smoke, or an error message that stops the cycle. The oven may also fail to hold steady temperature or overshoot during preheat. This is separate from self-clean mode, which intentionally runs very hot.

Jump to Fix

Most Likely Causes

Failed temperature sensor or thermistor The sensor is reading out of range or has drifted, so the control board cannot tell when to cut power to the heating element.
Faulty control board or relay board The board is not switching the heating element off at the correct temperature, even when the sensor is sending accurate readings.
Damaged or loose sensor wiring and connectors Heat damage, corrosion, or a loose plug at the sensor or control board creates a false high-resistance reading that confuses the board.
Sensor probe positioned incorrectly or touching metal If the sensor tip is bent out of position or grounded against the oven wall, it will read the wrong temperature.
Shorted or stuck relay on the control board A relay that stays closed will send continuous power to the heating element, bypassing the thermostat logic.

How to Diagnose and Fix

Press CLEAR/OFF or turn off the circuit breaker for 30 seconds to five minutes to reset the control board, then test the oven again.
Unplug the range or shut off power at the breaker and remove the back panel or oven liner to access the temperature sensor, usually a thin metal probe mounted in the upper rear wall of the oven cavity.
Inspect the sensor probe and its wire harness for heat damage, cracks in the insulation, or a loose connector at the sensor or board.
Disconnect the sensor plug and measure the resistance across the two sensor terminals with a multimeter while the oven is cool (room temperature), looking for a reading around 1,000 to 1,100 ohms as a rule of thumb.
If the reading is open (infinite), very low (under 500 ohms), or unstable, replace the temperature sensor.
If the sensor and wiring test normal, check the control board and relay board for visible burn marks, cracked solder joints, or stuck relays, and replace the board if you find damage or if the fault persists after sensor replacement.
Reassemble the oven, restore power, and run a test bake at 350°F for 15 minutes with an oven thermometer inside to verify the temperature is stable and accurate.

Parts You Might Need

Part	Notes
Oven temperature sensor / thermistor	Amazon \| Metal probe, usually about six inches long, with a two-wire plug.
Main oven control board	Amazon \| Replace if sensor tests good but oven still overheats or if you see visible board damage.
Relay board	Amazon \| Some LG ranges use a separate relay board to switch oven power; check your model’s wiring diagram.

If your appliance also shows a code on the display, these match this problem:

When to Call a Pro

Call a technician if you are not comfortable working inside a 240-volt electric range, if you cannot access the sensor or control board safely, or if the oven continues to overheat after you have replaced the sensor and verified all wiring. A pro can also perform live voltage checks at the heating element and board to isolate a stuck relay or board fault. For gas ranges, any work involving the gas valve, burner, or igniter system should be handled by a qualified service tech. For gas line, burner, or igniter work, or if you ever smell gas, stop and call a licensed technician.