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LG Oven Not Heating? Here’s Why and How to Fix It

If your LG oven is not heating up, The most common reasons are limited power supply, error code-based problems, or a defective igniter. To troubleshoot these issues:

  1. Check your outlet to ensure it provides enough electricity.
  2. Refer to your oven’s manual or contact customer service to troubleshoot error codes.
  3. Check the igniter to ensure it’s functioning correctly.

Taking these steps can help keep your LG oven running smoothly.

As an LG oven owner for a long time, there are moments when my oven will stop heating, and suddenly I have raw food, which is surely not the best life I want. But the good news is there are a lot of resources online to help you solve any heating problems with your oven.

In this article, you will find seven of the most common reasons your LG oven has problems. This article also provides basic and easy instructions on troubleshooting any possible problem with your oven. 

Reasons why your LG oven is Not heating

Here are 7 of the most common reasons why your LG Oven is not heating up:

  • Limited power supply
  • Error code-based issues
  • Blown-out fuse or switch
  • Electrical shorts in your oven
  • Faulty heating element
  • Defective igniter or safety valve
  • Malfunctioning control board

Power-Related Issues

A 240-volt, 40A to the 50-ampere circuit is required to operate an LG electric oven. Therefore, plugging your LG electric oven into a standard 110 or 120-volt outlet will not allow it to heat up and reach your desired cooking temperature.

LG’s electric and gas ranges both use the error code PF to indicate a lack of electricity problem. As such, you should double-check that the wall outlet and the circuit breaker are on and provide your oven with the power it needs.

Voltage fluctuations and irregular currents could harm the ability of LG electric ovens to heat up properly. However, the gas oven’s heating capabilities should be unaffected by real-time power, voltage, or amperage fluctuations. The control board, sensors, and other electronic components of an LG gas oven need energy to function properly.

How to Fix It

For issues with electricity, these are the initial checks and fixes that must be implemented:

  • Make sure the wall socket can supply the necessary voltage and amount of current needed for your oven.
  • The circuit breaker must have the correct amperage and voltage ratings.
  • Never plug a gas or electric LG oven into an extension cord.
  • If your oven is experiencing temporary problems, try unplugging it, switching off the breaker, then turning it back on.

Get an electrician to inspect the wiring if you are unsure of the wall outlet’s voltage or rated amperage to avoid unnecessary accidents. 

Error Code-Based Issues

There are around two dozen different error codes for LG ovens. However, not every model has the same error codes. Therefore, you must always check your appliance’s manual for more details about your specific model. But the bad news is that most LG manuals don’t provide a detailed explanation of these codes. 

Consider the touchpad problem known as “key short error,” which manifests as a breakdown in connection between the control board and the hardware. For example, in some models, the F1 error code may indicate a stuck button or a problem with the control board connection. Meanwhile, with the LG EA780SP oven, it signals a thermistor short.

One possible explanation for an LG oven that won’t heat up is a short circuit in the thermistor or temperature sensor and hence in the thermostat. Your oven may use a different error code, so make sure to check your oven’s model and try to look for its specific error codes.

For the LG oven models REL6325, LREL6323, LREL6321, etc., the F-3 error number indicates a short circuit in the keypad or the control panel.

F-9, which means your LG oven isn’t heating, is the only standard error code among all LG ovens. However, this is still neither explained nor specified in the instructions. LG suggests contacting their official service center.

A communication problem is indicated by the error code F-11; meanwhile, a control board failure is indicated by the F-12 code. However, a faulty control board is another possible cause of communication problems. 

Therefore, it is best to suggest a generic and comprehensive diagnosis of the critical components of ovens.

How to Fix It

If you set the temperature or timer to a value below the minimum or above the maximum allowed by the mode you’ve selected, the LG oven will not turn on. In the case of a data entry error, you may hear two short tones. Additionally, a new temperature setting requires confirmation within 25 seconds. If not, the input is meaningless and won’t allow your oven to start.

Some LG models, like the LDE441, include a similar feature where the bake element turns off after 30 seconds if the door is left open. Therefore, the oven may not heat up even after preheating and opening the door to set your items on the racks.

If you get an error message, look it up in the manual to learn more about what it means and how to fix the particular issue. 

Burnt Out Limit Switch or Fuse

Thermal fuses and limit switches are standard on LG ovens. If the thermal fuse or limit switch in your LG oven has blown, your oven won’t heat up. If you have an LG range, the oven’s fuse or limit switch won’t have any effect on the stove. Even if the fuse or limit switch blows, the control panel or display may still be operational. 

Fixing a Blown Fuse or Switching Outlets

The thermal fuse or limit switch should be checked and replaced if necessary. In the event of a power surge that has blown a fuse in your LG oven, you can reset the limit switch to get it working again. Typically, there is no way to reset an old thermal fuse.

The Unit Experienced Electrical Shorts

An LG oven won’t heat if there’s an electrical short somewhere. The following elements can develop a short:

  • A keypad or touchpad
  • Display or the control panel
  • Thermistor or thermostat
  • Parts that generate heat
  • Convection fan motor
  • Main control unit

How to Fix It

You can find the faulty component in a modern LG oven by using the error code. However, an electrician or oven specialist may be required to identify the source or cause of the shortage. If you are not a technician, you should not try to diagnose an electrical short in an LG oven to avoid accidents such as electric shock and even house fire.

The Heating Element Is Damaged

If the heating elements in an LG electric oven are broken, then the oven will not heat up. A heating element might rust over time, develop a short, or become inefficient from dirt and grime accumulation. The cause of such problems is always a faulty or malfunctioning heating element. Therefore, it is important to regularly examine each element of an LG oven’s heating system.

How to Fix It

Make sure the LG stove’s heating components aren’t flashing a strange color, such as a glowing red or orange. At a minimum, a single electric oven will have two heating elements, one for baking and one for broiling. An LG range oven could feature three or more depending on the specific model. The oven won’t heat if any of the elements are dead.  

If you are not sure if any of these heating elements is defective, it is better to call an experienced technician or your manufacturer to have your oven checked and have it working again in no time. 

Weak/Faulty Igniter of Safety Valve

Instead of using electric heating elements, LG’s gas ranges and ovens feature igniters and safety valves. If the gas burner’s igniter is broken or malfunctioning, you cannot bake or broil. Even if the igniter is fine, the gas won’t get to the burners if the safety valve is broken, jammed, or malfunctioning. 

How to Replace a Faulty Igniter

If you find out that the igniter or safety valve is malfunctioning, you must replace it immediately. As you use your oven every time you cook, the resistance of an igniter decreases over time, making it less likely that the burners on your LG oven will light when you apply the gas. Similarly, if a safety valve is damaged, it could cut off the natural gas or propane supply. 

To solve this problem, your only option is to ask for professional assistance in replacing your oven’s igniter. It is best not to perform this by yourself, especially if you don’t have enough knowledge about appliances. 

Control Board Failure

If your LG oven’s control board malfunctions, your oven won’t heat up. An electronic control board doesn’t have to be completely fried or burned out to make your oven stop working. You may also find that some of your connections and wiring are working properly, but if the relays for the heating elements have failed or been burned out, it will not allow your oven to work nor heat up to your desired cooking temperature.

Replacing Your Oven Control Board

There are a variety of error codes that can indicate a defective control board in an LG oven. However, before drawing any conclusions, you should examine all harnesses and wiring.

It is not possible to fix an oven’s control board. Therefore, your only solution for this problem is to install a new control board for your LG oven. Contact a skilled technician or your oven’s manufacturer to help you with this replacement.


It is a common problem for the oven to not heat up or have some temperature issues occasionally. No matter how good or great the brand is, oven heating issues are inevitable.

So, if you find yourself wondering why your oven suddenly stopped working and won’t achieve your desired cooking temperature, try to check if your outlet is providing you with enough power supply to make your oven work or if any of the parts are working and looking fine.

If you are experiencing this issue frequently, it is best to have your appliance checked by your manufacturer or an expert in this type of project. You don’t want another delayed dinner because your oven won’t start heating up. 


  • Hunter Hayes

    Hunter Hayes is a seasoned wordsmith with an obsession for all things related to Home Improvement. With years of experience in the subject, he brings to a unique blend of technical understanding and approachable writing. Hunter's articles not only explain complex thermodynamic ideas, but they also provide practical advice for day-to-day temperature management. Hunter's intelligent contributions will keep you well-informed and comfortable in every circumstance, whether you're intrigued about climate science or looking for help on optimising your home's HVAC system.

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