What does LG Oven F12 Error Code - Causes & Fix mean?

F12 signals an EEPROM or control board memory fault. Try a full power reset first. If the code returns, replace the main control board.

How do I fix LG Oven F12 Error Code - 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 F12 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 F12 Error Code - Causes & Fix?

The most frequently replaced parts for LG Oven F12 Error Code - 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 F12 Error Code - 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 F12 Error Code - Causes & Fix

LG Oven F12 Error Code — What It Means

The F12 error code on an LG oven indicates an EEPROM-related fault on the main control board. EEPROM is nonvolatile memory that stores oven settings and calibration data. When the board’s logic cannot read or write to this memory correctly, it throws F12. This is a control-board error, not a problem with heating elements, sensors, or door switches. LG’s official U.S. support page does not list F12 in its published error-code table, but third-party repair guidance confirms it points to the main electronic control board rather than field-replaceable sensors or igniters.

Jump to Fix

Common Causes

Main control board failure The primary cause is a defective control board where the EEPROM chip or its supporting circuitry has failed.
Temporary logic corruption A power surge or brief glitch may corrupt board memory temporarily, which sometimes clears after a full reset.
Loose or damaged board connectors Wire harness plugs that are not fully seated or have heat-damaged pins can cause intermittent communication errors.
Moisture intrusion on the board Steam or spills that reach the control board area can cause corrosion or shorts in EEPROM circuits.
Overheating or component solder cracks Thermal stress over time can crack solder joints around the EEPROM or microcontroller, breaking electrical paths.
Board age and wear Older control boards may develop EEPROM write failures due to the finite number of write cycles nonvolatile memory can handle.

Step-by-Step Fix

Turn off power at the circuit breaker for 30 seconds to 5 minutes, then restore power and check whether F12 clears.
If the code clears, run a normal bake cycle to confirm the oven heats and completes the cycle without the error returning.
If F12 reappears, unplug the range or turn off power and remove the back panel or control-panel cover to access the main control board.
Inspect the board for visible burn marks, discolored components, or moisture damage around the EEPROM chip and microcontroller area.
Check every wire harness connector to the main board, push each plug fully home, and look for heat-damaged or corroded pins.
If wiring is intact and the error persists after retest, replace the main control board with a new or remanufactured unit matching your model number.
Reinstall the panel, restore power, and verify the oven powers up cleanly, accepts temperature commands, and completes a short heat cycle without throwing F12 again.

Parts Often Needed

Part	Notes
Main control board (electronic control board, PCB)	Amazon \| Match your exact LG model and serial number to make sure connector pinouts and firmware are correct.
Wire harness or connector repair kit	Amazon \| Only needed if you find melted or corroded terminals at the board plugs during inspection.

When to Call a Pro

If you are uncomfortable working with 240-volt wiring or removing control panels, or if you do not have a multimeter and basic hand tools, call a qualified appliance technician. Control board replacement on a range requires safe disconnection of line voltage and proper reassembly of sheet-metal covers. A technician can also verify that the new board is programmed correctly for your oven’s feature set and run a full functional test to rule out secondary faults. If your oven is under warranty or part of a recall, contact LG support or an authorized service center before purchasing parts on your own.