What does LG Oven Not Heating - Causes & Fix mean?

Failed heating element or broken oven temperature sensor. Test elements for continuity and sensor for proper resistance at room temp.

How do I fix LG Oven Not Heating - Causes & Fix?

Follow the step-by-step diagnosis below. The most likely fix is identified by checking power, sensor resistance, and control-board signals in order — using a multimeter and the part numbers documented in the parts reference table.

Can I keep running the equipment with this fault active?

Generally no. Faults on Appliance units are emitted when a sensor, safety, or control circuit is outside its operating envelope. Running through an active fault risks compressor, heater, or control-board damage. Diagnose and clear the fault first.

What part is most commonly replaced for LG Oven Not Heating - Causes & Fix?

The most frequently replaced parts for LG Oven Not Heating - Causes & Fix are listed in the Parts Reference section of this guide with OEM part numbers and typical price ranges. Check the table for direct replacements.

Is LG Oven Not Heating - Causes & Fix a DIY repair or do I need a technician?

Sensor swaps, fan motor replacements, and condenser cleaning are typical DIY-level repairs. Anything involving refrigerant, gas, or high-voltage (>240V) work requires a licensed technician for both safety and code-compliance reasons.

LG Oven Not Heating - Causes & Fix

LG Oven Not Heating — What’s Happening

When your LG oven does not heat, the control board has detected that the oven temperature did not rise as expected during preheat. LG defines this fault as the oven not exceeding 150°F within 5 minutes of preheating with the door closed, or in some models not rising more than 10°F in 5 minutes. This is a performance fault, not a single component code.

The control board monitors temperature rise through the oven sensor and commands heating elements or gas burners accordingly. When the expected temperature rise does not happen, the board may display F9 (upper oven not heating properly) or F7 depending on your model family. The fault points to a break somewhere in the heating circuit, the temperature sensing circuit, or the control logic itself.

Jump to Fix

Most Likely Causes

Failed heating element A burned-out bake or broil element is the primary cause of no-heat faults in electric LG ovens and is listed first in LG’s own troubleshooting guidance.
Faulty oven temperature sensor An open or out-of-spec thermistor prevents the control board from reading temperature correctly and is a documented common cause by LG Parts.
Loose or damaged wiring to sensor or elements Broken connectors, burned terminals, or damaged harnesses between the sensor, heating elements, and control board are repeatedly listed by LG as likely causes.
Bad control board or relay contacts When the sensor and elements test good, failed relay contacts or a faulty main control board are the next most common technician diagnosis.
Power supply or voltage problem Insufficient voltage to the range can prevent proper heating and LG instructs checking the power supply when no-heat symptoms persist.
Failed igniter or gas safety valve (gas models) On gas ranges, a weak igniter that does not draw enough current or a stuck gas valve will prevent burner ignition and heating.

How to Diagnose and Fix

Turn off the circuit breaker to the range for 30 seconds, then turn it back on and retry a preheat cycle to rule out a transient control fault.
Verify the range is receiving correct voltage at the terminal block and that the breaker is properly sized per the installation manual.
On electric models, visually inspect the bake and broil heating elements for breaks, blisters, or visible damage, then test each element for continuity with a multimeter.
Test the oven temperature sensor at room temperature and confirm it reads approximately 1,080 ohms, then inspect the sensor wiring and connector for damage or corrosion.
On gas models, have a qualified technician measure igniter current draw during a heat cycle and verify the gas safety valve opens when the igniter reaches proper amperage.
Check all wiring harnesses and connectors between the sensor, heating elements or burner, and the control board for burned terminals, loose pins, or broken wires.
If the sensor and heating elements test good and wiring is intact, inspect the relay board and main control board for burned relay contacts or visible damage, then replace the faulty board.
After replacing any component, run a full preheat cycle and verify the oven reaches setpoint temperature within the expected time.

Parts You Might Need

Part	Notes
LG oven heating element (bake or broil)	Amazon \| Specify your model number when ordering to get the correct element.
LG oven temperature sensor / thermistor	Amazon \| Should read around 1,080 ohms at room temperature.
LG range control board or relay board	Amazon \| Requires model-specific part number and often professional installation.

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

When to Call a Pro

Call a professional if you are not comfortable working with line voltage, if you own a gas range and suspect an igniter or gas valve fault, or if basic component tests (elements and sensor) all pass but the oven still does not heat. Control board diagnosis and replacement require experience with wiring harnesses and proper part matching. For gas appliances, any work involving the igniter, gas valve, or burner assembly should be handled by a qualified technician to prevent gas leaks or unsafe operation. For gas line, burner, or igniter work, or if you ever smell gas, stop and call a licensed technician.