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LG Oven Not Heating? Here’s Why (+ How To Fix)

Any LG oven not heating is a perplexing issue. This is due to the brand’s reluctance or policy, which results in a lack of specific details regarding most error codes. So, you may be left wondering why your LG oven is not heating, irrespective of the error on display.

Here are some of the reasons why your LG oven is not heating:

  • Power-related problems
  • Error code-based issues
  • Blown fuse or limit switch
  • Electrical shorts in the unit
  • Broken heating element
  • Faulty igniter or safety valve
  • Malfunctioning control board

LG makes gas and electric ranges, along with wall or built-in and double ovens, which explains why their appliances not heating can be confounding. However, when faced with this issue, you have to prioritize the most common probable causes. Read on to learn why your LG oven is not heating and how to fix it. 

Power-Related Problems

An LG electric oven needs a 240V power supply with a 40A to 50A circuit. Thus, your LG electric oven won’t heat if you connect it to a regular 110V / 120V outlet. 

Also, both electric and gas ovens made by LG feature an error code PF, to imply power failure. So you must check the wall outlet and circuit breaker to ensure you have a live connection. 

Voltage fluctuations and abnormal current may impair the heating function of LG electric ovens. But real-time power, voltage, or amperage fluctuations shouldn’t impair the heating in a gas oven. However, LG gas ovens also rely on electricity for the control board, sensors, etc. 

How To Fix

Here are the preliminary inspections and remedies for the power-related problems:

  • Check the wall outlet to ensure it is rated for the voltage and amperes your oven needs.
  • Inspect the circuit breaker to be sure it is rated for the required voltage and amperage.
  • Don’t use a power extension cord for any LG oven, whether it is gas or electric.
  • Unplug the oven, reset the circuit breaker, and restart the unit to fix transient glitches.

If you aren’t sure about the wall outlet voltage and rated amperage, get an electrician to review the entire installation.

Error Code-Based Issues

LG ovens have more than two dozen error codes. However, these error codes aren’t identical in all their models. Hence, you have to refer to your manual and then wish for LG to give you more details because those instruction booklets don’t explain the problems as you and I would prefer.

Consider the key short error, which is a problem with the touchpad, i.e., a communication issue with the control board. In some models, the F1 error code indicates a stuck button or connection issue with the control board, while the same implies a thermistor short in LG’s EA780SP oven.

Now, a short circuit for the thermistor or temperature sensor, and by extension, the thermostat, is a potential cause for an LG oven not heating. But I can’t tell you definitively because your oven may have a different error code. 

For instance, the error code for a short circuit in the keypad or the control panel is F-3 for LG oven models REL6325, LREL6323, LREL6321, etc.

The only error code that is somewhat of a standard is F-9, implying your LG oven isn’t heating. But the manuals still don’t explain or specify the reason. LG recommends contacting the service center. 

To further complicate the error codes, F-11 means a communication issue, and F-12 implies that the control board is failing or faulty. However, a communication issue can also be due to a failing or defective control board. So, is the wiring and connection the problem or is the control board the issue?

Therefore, I have to suggest a generic and comprehensive diagnosis of the critical components in ovens. 

How To Fix

LG ovens don’t function if you select a temperature or time less than the minimum or beyond its maximum setting in a chosen mode. You may hear two short tones as an entry error. Also, you’ll need to confirm a new temperature setting within 25 seconds. Else, the input is null and void. 

Similarly, the bake element in some LG models, like the LDE441, turns off if you open the door for 30 seconds. Hence, such an oven may not heat, even if you have pre-heated it and opened the door to place your goodies on the racks. 

For any error code you see, you must refer to the manual to decipher what it means exactly to solve the problem. 

Blown Fuse or Limit Switch

LG ovens have a thermal fuse or limit switch. A blown thermal fuse or limit switch will prevent an LG oven from heating. The oven’s fuse/limit switch doesn’t affect the stove if you own an LG range. Also, you may still have a live control panel or display if the fuse or limit switch fails. 

How To Fix

The remedy is inspecting the thermal fuse or limit switch and replacing it if necessary. LG ovens’ limit switches may have a reset button that you can use to restore the part’s function, especially after a power surge that could trip the fuse. Old thermal fuses usually don’t have a reset button. 

Electrical Shorts in the Unit

Any electrical short in an LG oven may prevent it from heating. Here are the components that can develop a short:

  • Keypad / touchpad
  • Display / control panel
  • Thermistor / thermostat
  • Heating elements
  • Convection fan motor
  • Main control board

How To Fix

Contemporary LG ovens have error codes that help you to identify the part that has a short. But in most cases, you may need an electrician or oven technician to detect the source or cause of the short. I don’t recommend investigating an LG oven with a short unless you’re a technician.

Broken Heating Element

LG electric ovens won’t heat if the heating elements are faulty. A heating element may deteriorate in time, have a short, or be inefficient due to grimy buildup. In all such cases, a failing or broken heating element is the culprit. Hence, you need to check all the heating elements in an LG oven.

How To Fix

Check if the heating elements in your LG oven are glowing red or orange. An electric oven has at least two heating elements for baking and broiling, respectively. An LG oven may have three or more, subject to the model. If any isn’t working, you have to replace it for the oven to heat.  

Faulty Igniter or Safety Valve

LG gas ovens and ranges use igniters and safety valves instead of electric heating elements. A failing or damaged igniter won’t light the gas burner, hence won’t bake or broil. Likewise, a failing, stuck, or defective safety valve won’t supply the gas for the burners, irrespective of the igniter’s condition. 

How To Fix

You have to replace the faulty igniter or safety valve, subject to what you detect as the culprit. An igniter can lose its resistance with time, so it won’t glow and light the gas flowing through your LG oven burners. Likewise, a broken safety valve may prevent the flow of natural gas or propane. 

Malfunctioning Control Board

A malfunctioning control board will prevent an LG oven from heating. An electronic control board doesn’t have to be completely fried for an appliance like an oven to stop working. You may have a few connections working fine, while the relays for the heating elements might have failed.  

How To Fix

LG ovens have multiple error codes to show that the control board is faulty. However, you need to check all the wirings and connections or harnesses before you come to a conclusion. An oven control board isn’t repairable. Thus, you have to get a new control board for your LG oven, whether gas or electric.