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LG oven error codes: what each one means

This list covers confirmed LG oven, range, and wall oven codes used on current US cooking models, including oven, surface, griddle, steam, and status messages that can show on the same control. Match the code exactly, try only the safe check listed, and unplug the appliance or turn off the breaker before cleaning or touching anything.

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Reading the code

LG oven and range codes appear on the control panel or touch screen as F numbers, short words, or cooktop numbers. To clear most codes, press CLEAR/OFF, STOP, or Power, then unplug the appliance or turn the breaker off for 30 seconds before trying again. Loc, CHILD LOCK, or OVEN LOCKOUT is a lock status, Sb/5b/S6/56 is Sabbath mode, DEMO is showroom mode, HS/H5 is a hot surface reminder, and PF means power was interrupted.

Have the model number ready

The company will ask for it first. It's on a sticker or metal plate, usually in one of these spots:

Where the model tag usually is on a oven12
  1. Behind the storage drawer, on the frame
  2. Or on the oven frame, visible with the door open

LG oven & range error codes

Covers current US LG electric, induction, gas, and dual fuel range controls plus wall oven controls; some older models map F codes differently, so match the model manual when a code meaning conflicts.

29 codes

CodeWhat it meansCheck firstUsually
F9 / F6 / F19The oven did not heat properly, with F9 commonly tied to the upper oven and F19 to the lower oven on many double oven or wall oven controls. Full guide →Press CLEAR/OFF or STOP, set the oven again, and reset power once; if the code returns, a technician needs to diagnose the heat circuit or fuel setup.Usually a technician
F3The control detected a touch pad sensor key error, often a key that is stuck or being pressed too long.With power off, clean and dry the control area and remove anything pressing a key; if the code returns, a technician should check the console.Often a home check
PFPower to the appliance was interrupted.Press CLEAR/OFF. If PF is on a cooktop element display, press that element's ON/OFF key, then set the clock if needed.Often a home check
Sb / 5bSabbath mode is on; on some displays the same status may look like S6 or 56.Follow the model's Sabbath cancel steps, often Bake, set a temperature, Start, then hold Clock for 3 seconds.Often a home check
Loc / CHILD LOCKControl Lock, Lockout, or a hot door lock status is preventing cooking.Hold START or LOCK for 3 seconds, or let the oven cool after cleaning before trying CLEAR/OFF.Often a home check
DEMODemo mode is on and the oven will not heat.Open Settings and turn Demo Mode off, or check the model manual for the matching menu path.Often a home check
HS / H5The cooktop surface is hot enough for the hot surface reminder.Wait for the surface to cool; if the reminder stays on at room temperature, reset power once.Often a home check
F1 / F2The control detected an upper oven thermistor error.Press CLEAR/OFF and reset power once; if the code returns, a technician should check the upper oven temperature sensor circuit.Usually a technician
F4 / F5The control detected a lower oven thermistor error.Press CLEAR/OFF and reset power once; if the code returns, a technician should check the lower oven temperature sensor circuit.Usually a technician
F16The control detected an oven sensor issue.Press CLEAR/OFF and reset power once; if the code returns, a technician should diagnose the oven sensor circuit.Usually a technician
F7 / F17The control detected a convection fan error.Press CLEAR/OFF and reset power once; if the code returns, a technician should check the convection fan and its control circuit.Usually a technician
F8 / F18The control detected an oven meat probe error.With power off and the oven cool, remove the meat probe and restart without it; if the code returns, a technician should check the probe circuit.Often a home check
F10 / F20The control detected a door locking system failure in the upper or lower oven.Let the oven cool fully, hold CLEAR/OFF for more than 3 seconds if the door is locked, and reset power for 5 minutes; if the code returns, a technician should diagnose the latch system.Usually a technician
F11 / F38The control detected a communication error, including main board to inverter communication on some models.Reset power once; if the code returns, a technician should diagnose the control board communication circuit.Usually a technician
F21 / F22The control detected a steam sensor failure on a steam equipped model.Reset power once; if the code returns, a technician should diagnose the steam sensor circuit.Usually a technician
F24 / F25The control detected another steam sensor failure on a steam equipped model.Reset power once; if the code returns, a technician should diagnose the steam sensor circuit.Usually a technician
F27The cooling fan stalled or locked during self clean.Stop the clean cycle if possible, let the oven cool, and reset power once; if the code returns, a technician should check the cooling fan system.Usually a technician
F33 / F34The control detected a front induction burner temperature sensor error.Reset power once; if the code returns, a technician should check the surface temperature sensor circuit.Usually a technician
F36The control detected a transistor error.Reset power once; if the code returns, a technician should diagnose the transistor or power module circuit.Usually a technician
6 / F42The control detected low voltage or another voltage error.Reset power once; if the code returns, a technician should check the supply voltage and control electronics.Usually a technician
F45 / F46The control detected a fan error.Reset power once; if the code returns, a technician should diagnose the fan circuit.Usually a technician
F51The control detected a griddle sensor error.Reset power once; if the code returns, a technician should check the griddle sensor circuit.Usually a technician
F52The control detected a griddle sensor short.Reset power once; if the code returns, a technician should check the griddle sensor circuit for a short.Usually a technician
F56 / F59The griddle is not heating properly.Reset power once; if the code returns, a technician should diagnose the griddle heating circuit.Usually a technician
F62The control detected a sous vide temperature sensor error.Reset power once; if the code returns, a technician should check the sous vide temperature sensor circuit.Usually a technician
F69The sous vide feature is not heating properly.Reset power once; if the code returns, a technician should diagnose the sous vide heating circuit.Usually a technician
1 / 2 / 3On radiant cooktop controls, these numbers indicate a thermistor error.Reset power once; if the code returns, a technician should check the cooktop thermistor circuit.Usually a technician
4Metal objects or water have been on the cooktop touch pads for too long.With power off, clean and dry the cooktop touch area and remove pans or utensils from the pads; if the code returns, a technician should check the controls.Often a home check
5The control detected a display error.Reset power once; if the code returns, a technician should check the display and control circuit.Usually a technician

Don't see your symptom?

Describe it on the phone. The company on the other end works on these every day and will know what to ask.

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Common questions about appliance repair

What if the code clears after a power reset?

Run one short bake test only if the display is clear and the oven acts normal. If the same fault returns, stop using that function and have a technician diagnose it.

Why does my older manual give a different meaning for the same F code?

LG has used different controls across range and wall oven lines. Match the code to the model manual when an older chart conflicts with a current code list.

Are PF, Sb, HS, Loc, or DEMO fault codes?

PF, Sb, HS, Loc, and DEMO are usually status messages, not failed parts. Clear the setting or status first, then look for a repeating F code if the oven still will not run.

Should I keep using the oven if F9 or F19 returns?

No. A repeating heating code can involve high voltage parts or the fuel setup, so a technician should diagnose it before more cooking attempts.

Still showing the problem after the checks?

Call and describe what you tried. You'll be connected with an independent repair company near you.

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