On the covered LG range or oven, F33 means a Front Induction Burner Temperature Sensor Error — LG's own wording. First, note which burner was in use. Then: for F33 LG says to turn the breaker off, count 30 seconds and turn it back on, with no CLEAR/OFF step — LG's own sequence.
Differential
Likely causes of “LG range or oven code F33”, and how to tell them apart
- 1
A front induction burner temperature sensor fault
What separates it The code appears when the front burner is used
How to confirm Note which burner was in use
- 2
Pan or cookware that overheats the burner
What separates it The code appears with an empty or thin pan
How to confirm Try a heavy pan with food
- 3
A sensor wire fault under the glass
What separates it The code comes and goes
How to confirm A technician checks the connection
- 4
A control fault
What separates it Replacing cookware does not help
How to confirm A technician tests the burner circuit
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which burner was in use
- The cookware used
- Whether the pan was empty
Try in this order
0 of 13 completedWhat to do first
ReversibleNote which burner was in use.
Correct only the documented fault domain
ReversibleFor F33 LG says to turn the breaker off, count 30 seconds and turn it back on, with no CLEAR/OFF step — LG's own sequence.
Use other burners
ReversibleUse the other burners while you wait for service, and keep the front burner off.
Note whether the code comes with a pan or without
ReversibleA burner that shows F33 or F34 with a cool, empty cooktop points to the sensor circuit, while one that shows it only after long, hot cooking points to heat. Tell the technician which it is.
Keep the vents beneath the cooktop clear
ReversibleAn induction cooktop needs air to move through the cabinet below. Do not store trays or boxes tightly under or behind the range, and wipe lint and grease from any vent slots.
Ask what was measured on the visit
ReversibleA technician should read the sensor and its connector and say what the reading was. Ask for the part number so that a later visit can see what was fitted.
Try a suitable pan
ReversibleOnce the surface is cool, use a flat-bottomed pan made for induction with liquid in it; an unsuitable or dry pan can push the temperature reading out of range.
Use LG's breaker reset
ReversibleTurn the breaker off for 30 seconds and back on; there is no CLEAR/OFF step for this code.
Try a different pan
ReversibleA heavy, flat, magnetic pan with some water in it; thin or warped pans overheat the burner.
Never heat an empty pan
ReversibleInduction heats the pan very fast and an empty one can trip the sensor.
Check the glass
ReversibleLook for cracks, burn marks or a loose ring around the burner.
Test the other burners
ReversibleIf only the front burner shows the code, the fault is at that sensor.
Record the burner
ReversibleSay which burner was in use and what pan.
Model-specific
What is true of this model and not of its siblings
- Induction
- The burner heats the pan by magnetic field, not by flame or coil.
- Pan
- Magnetic, flat and heavy is best.
- What LG says
- LG's list gives the breaker reset, then service.
Stop boundary
When this stops being a self-service repair
- !LG gives a breaker reset for this code; if it returns, book service
- !Do not use the burner until repaired if the glass is hot or cracked
- !Never put an empty pan on an induction burner
Evidence ledger
Sources behind this answer
Where the manufacturer's article stops. LG words F33 and F34 identically, so they share this page.
Exact questions
Common questions
What does F33 mean on a LG range or oven?+
a Front Induction Burner Temperature Sensor Error — LG's own wording.
Can I use other burners?+
Generally yes, but keep the front burner off until repaired.
Is the cooktop unsafe while F33 shows?+
The affected burner is out of service, which is the safe state; do not try to override it.
Can a cracked glass cause the code?+
Hairline cracks can disturb the reading, so the technician should look at the glass.
Which codes name the front induction burner's temperature sensor?+
LG words them as an error in a front induction burner's temperature sensor.
Can the pan cause it?+
Yes, an empty, thin or warped pan can overheat the burner and trip the sensor.
Do I need to stop using the oven?+
The oven is a separate circuit, so it usually works.
What if it comes back?+
Book service with the model number, the burner and the pan you used.
Is the glass top involved?+
The sensor sits under the glass, so a cracked top should not be used.
Which burners are induction on my range?+
LG induction models have glass-top burners marked with rings, and the manual shows the layout; only those burners can give this code.
What does a good pan look like?+
A flat-bottomed, heavy pan that a magnet sticks to, about the size of the ring, with food or water in it.
Should I stop using that burner?+
If the code returns with a good pan and some water, stop using that burner and book service so that a technician can test the sensor and the burner circuit.