What does F-1 mean on a LG range & oven?

The oven sensor — the thin probe on the back wall of the oven — is reading open (F-1) or shorted (F-4). The control cannot see the oven's temperature, so it will not heat. A code that returns is the oven sensor or its wiring — a part behind the oven's back wall, a technician's job. The cooktop still works meanwhile.

What does F-9 mean on a LG range & oven?

The oven was set and its temperature did not rise the way the control expected. Electric: an element or a relay. Gas: the igniter did not light the burner. A bake element, an oven igniter or a relay is a part — a technician's job, and on a range under warranty a warranty service call. Stop using the oven while it stands.

What does F-2 mean on a LG range & oven?

The self-clean door lock did not reach the position the control asked for — it did not lock for a clean, or it will not unlock after one. A latch that still does not move after the oven is cool and the power has been reset is the door lock motor or its switch — a part, a technician's job. Do not force the door.

What does F-10 mean on a LG range & oven?

The control panel and the main board lost communication with each other. An F-10 that returns is the harness between the boards or one of the boards — a service call.

Error codes · LG · Ranges & ovens

LG range & oven error codes: a sensor, a door latch, or a key held down.

An LG range prints F and a number, and the list is short — the oven sensor, the door latch, a stuck key, a board, an oven that did not heat. Find the code below, take the checks in order, and clear it with the reset in the strip above. The codes that need a technician say so; a gas smell is never a code to wait on.

Covers: 2015-and-newer LG electric and gas ranges (LRE, LREL, LSE, LSEL, LRG, LRGL, LSG, LSGL and the LG Studio ranges).

Jump to the codes Text (573) 353-8511

Jump to a code · 8 on this page

The code as the display prints it; an older spelling sits under it on the card.

F-1Oven temperature sensor

F-9Oven did not heat

F-2Door latch error

F-3Key stuck

F-7Control board fault

F-10Boards not talking

LocControl lock is on

dEMODemo mode

LG · First

Before you clear it

LG prints two-letter codes (OE, IE, dE, UE). A lower-case letter is the display's own shape, not a different code.

LG prints F- and a number (F-1, F-9) and beeps every so often while the code stands. Press Clear/Off to silence it; the code comes back if the fault is still there.

The reset: an electric range runs on 240V, so switch both halves of its double breaker off for one full minute; a gas range plugs into the wall — unplug it one minute. Switch on or plug in, set the clock, and try the oven again.

A Wi-Fi model shows the code and the next step in the ThinQ app under the range's tile; a model with a Smart Diagnosis mark sends its fault to the app when you hold the phone to the mark and press the button the app names.

The 240V behind an electric range and the gas line behind a gas range belong to a licensed installer. A gas smell: turn the burners off, open a window, leave the house and call the gas company from outside.

The model and serial plate is on the frame behind the storage or warming drawer (pull the drawer out and look at the left front) or on the back of the range. Every warranty call starts with those two numbers.

Section 1 of 2

The oven

F-1#1

Also printed as F1 · F-4 · F4

Service call

Code

Oven temperature sensor

What it means

The oven sensor — the thin probe on the back wall of the oven — is reading open (F-1) or shorted (F-4). The control cannot see the oven's temperature, so it will not heat.

Check first

Look at the probe on the oven's back wall near the top: it should sit straight with nothing touching it. A rack or a pan shoved against it bends it.
Reset (breaker off one minute) and set the oven to Bake 350°F. A sensor code that clears and stays gone was a one-off.

The fix

A code that returns is the oven sensor or its wiring — a part behind the oven's back wall, a technician's job. The cooktop still works meanwhile.

Stop & call

F-1 or F-4 after a reset is a service call. The oven will not heat until the sensor is replaced; the burners on top still work.

F-9#2

Also printed as F9

Service call

Code

Oven did not heat

What it means

The oven was set and its temperature did not rise the way the control expected. Electric: an element or a relay. Gas: the igniter did not light the burner.

Check first

Electric: set Bake 350°F and look at the lower element after two minutes — it should glow red. A dark element with the oven on is the element or the relay.
Gas: set Bake and listen; the igniter glows and the burner should light within a minute. A glow with no flame is a weak igniter; no glow is the igniter or the board.
Gas: the other burners on top light — if nothing lights, the gas supply or its shut-off valve is the question, and that is a licensed installer's.
Reset (breaker off or unplug one minute) and try again.

The fix

A bake element, an oven igniter or a relay is a part — a technician's job, and on a range under warranty a warranty service call. Stop using the oven while it stands.

Stop & call

F-9 after a reset is a service call. On a gas range, if you ever smell gas with the oven on, turn it off, open a window and call the gas company from outside.

F-2#3

Also printed as F2

Check, then call

Code

Door latch error

What it means

The self-clean door lock did not reach the position the control asked for — it did not lock for a clean, or it will not unlock after one.

Check first

The oven door closes fully on its own; a rack sticking out or a pan on the door stops the latch.
After a self-clean: wait — the door stays locked until the oven cools below about 500°F, which takes an hour or more.
Reset (breaker off one minute) and press Clear/Off; the latch motor runs a cycle on its own.

The fix

A latch that still does not move after the oven is cool and the power has been reset is the door lock motor or its switch — a part, a technician's job. Do not force the door.

Stop & call

F-2 with a cool oven after a reset is the lock motor. Do not pry the door; call it in with the code, the model and the serial.

Section 2 of 2

The panel and the boards

F-3#4

Also printed as F3

Fix at home

Code

Key stuck

What it means

The control sees a key held down for longer than it allows.

Check first

Wipe the whole panel dry — grease, a wet rag or a cleaning spray on a touch panel holds a key down.
Press each key once and feel for one that does not spring back.
Reset (breaker off or unplug one minute).

The fix

A key that stays stuck after cleaning is the touch panel (on most models the control and the panel are one part) — a technician's job.

F-7#5

Also printed as F7

Service call

Code

Control board fault

What it means

The control board found a relay or a key circuit on itself that it cannot trust.

Check first

Reset (breaker off or unplug five full minutes) and try the oven.

The fix

An F-7 that returns is the oven control board — a part, a technician's job. Switch the range off at the breaker until it is looked at if the oven heats on its own.

Stop & call

F-7 after a five-minute reset is a service call. An oven that heats when it was not told to goes off at the breaker and stays off.

F-10#6

Also printed as F10

Service call

Code

Boards not talking

What it means

The control panel and the main board lost communication with each other.

Check first

Reset (breaker off or unplug five full minutes) and try again.

The fix

An F-10 that returns is the harness between the boards or one of the boards — a service call.

Stop & call

F-10 after a five-minute reset is a service call. Nothing to check at home.

Loc#7

Also printed as Lock

Fix at home

Code

Control lock is on

What it means

Not a fault. The panel is locked so a child cannot start the oven; the display reads Loc (or shows the lock icon) and the keys do nothing.

Check first

Press and hold the key marked Lock (on most models Clear/Off, or the key with the lock symbol under it) for three seconds.

The fix

The lock turns off and the panel answers again.

dEMO#8

Also printed as DEMO · dEmo

Fix at home

Code

Demo mode

What it means

Not a fault. The panel lights and beeps and nothing heats — the range is in the showroom mode it shipped in.

Check first

The display shows DEMO, or every key answers and no element or burner ever comes on.

The fix

Turn it off through the settings menu (on most models press Settings, scroll to Demo, choose Off); on older panels press and hold the two keys the manual names for the demo mode for three seconds. The oven heats on the next Bake.

Warranty · When to file

When it's a warranty call

Every unit leaves with the manufacturer's full factory warranty. The codes below name a part inside the machine — once the checks have ruled out the install, the power and the hoses, call LG's line with the model and serial, and text us if you want a hand with the claim.

F-1Oven temperature sensor

F-9Oven did not heat

F-7Control board fault

F-10Boards not talking

Warranty help for LG

All units are surplus inventory (open box, cancelled order, customer return, overstock, or minor scratch & dent). Every unit includes the manufacturer's full factory warranty. Please inspect thoroughly in person before purchasing — cosmetic imperfections or missing accessories are possible.

Still stuck?

Text us the model number and what it's doing — we'll point you at the next step.

A fix, a part, or a warranty call — the plate's model and serial plus one line about the symptom is all it takes to tell which.

File a warranty inquiry Text (573) 353-8511 Browse Inventory Or reach us another way

These pages are educational. Every appliance is a little different — follow the manufacturer's manual and local code, and leave gas, water heater and 240V work to a licensed installer.

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