LG Cooktop F1 Error: IGBT module overheat
LG cooktop error — here’s what you need to know. The F1 error code on your LG cooktop indicates IGBT module overheat detected. This is a High severity issue. What Does F1 Mean on an LG Cooktop? The F1 error code means the induction cooktop’s IGBT (Insulated Gate Bipolar Transistor) power module — the high-power […]
~20%
DIY Fixable
From 00
Typical Repair Cost
60–150 min
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
No. Do not use the cooktop beyond quick testing. A repeatedly overheating IGBT can fail permanently and cause secondary damage to the control board if operated.
Can I reset the code?
Yes. F1 will clear automatically once the IGBT cools below its reset threshold. However, the code will return as soon as the module overheats again during the next cooking session.
When to stop immediately?
Stop if you notice: Stop immediately if you hear unusual crackling or smell burning from under the cooktop — the IGBT may be failing catastrophically., Stop if F1 appears within minutes of startup even at low power settings — the IGBT or fan has failed and must be replaced before further use..
Symptoms You May Notice
Induction zone shuts off after a few minutes of cooking
The zone appears to start normally but cuts out after several minutes as the IGBT module heats up to its thermal limit and the protection circuit activates.
F1 code on the zone display
The cooktop shows F1 on the affected zone's display and may lock out that zone until the module cools; other zones may continue to function.
Loud fan noise or complete fan silence before shutdown
A failing cooling fan may run at reduced speed with unusual noise before F1 appears, or a seized fan will be completely silent when the cooktop is in operation — either condition leads to IGBT overheating.
Clothes remain damp after a full cycle
Laundry comes out still wet or takes multiple cycles to dry because restricted airflow prevents proper moisture evaporation and exhaust.
Possible Causes
Failed or seized cooling fan
The cooling fan that draws air across the IGBT heat sink has seized, broken a blade, or burned out its motor, eliminating the airflow needed to keep the module within its thermal limit during operation.
Requires ProfessionalBlocked cooktop ventilation
Oversized cookware, a kitchen mat, or nearby objects are blocking the cooktop's air intake or exhaust vents, preventing adequate airflow across the IGBT heat sink.
DIY PossibleDegrading or failing IGBT module
The IGBT module itself has degraded from age or prior thermal stress and now generates excess heat even under normal operating conditions, causing it to exceed its thermal limit more quickly than a healthy module.
Requires ProfessionalSafe Checks You Can Do
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1
Allow the cooktop to cool and check ventilation clearances
After F1 appears, power off the cooktop and allow at least 20 minutes for the IGBT to cool. Check that nothing is blocking the cooktop's ventilation slots and that the installation has the required clearances on all sides per the owner's manual.
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2
Listen for the cooling fan when restarting
After the cooktop cools, restore power and activate a zone at medium power. Immediately listen for the cooling fan underneath — it should be audible within a few seconds of activation. Complete silence indicates a failed fan.
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3
Note how quickly F1 returns after cooling
If F1 returns within 2–3 minutes at low power after the module has fully cooled and ventilation is clear, the IGBT module itself is likely degrading and needs replacement.
When to Call a Professional
Contact a qualified technician if:
- No cooling fan sound during operation on a model with active cooling.
- F1 returns within minutes at low power after confirmed cooling and clear ventilation.
- IGBT module or power board replacement is required.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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