What F3 means (lg f3 error)
An lg f3 error on an LG cooktop indicates a touch-key fault — the control reads a key as continuously pressed or shorted. It often follows a boil-over or a wet panel, so the touch surface bridges a key contact, and it usually clears once the panel is clean and dry.
Symptoms to look for
The signs below help confirm you are dealing with this condition rather than a different fault on your LG Cooktop. You may see one of them or several together, and they can build up gradually or appear suddenly after a power event, a long door opening, or recent service.
- The display shows “F3”
- The touch controls respond erratically or not at all
- A key seems stuck or over-sensitive
- The fault may follow a boil-over onto the panel
Common causes
Several different faults can produce these symptoms. Working through the most likely causes in order helps separate a quick, owner-level check from a problem that needs trained service and the correct LG parts.
- Liquid on the touch panel — a spill bridges a key contact
- Stuck touch key — residue holds a key active
- Touch sensor fault — the panel misreads a key
- Control fault — the board misreads the touch matrix
Troubleshooting steps you can try
Work through these checks in order before calling for service. Stop wherever you are unsure, or where high-voltage parts, gas, the sealed refrigeration system, or a heat-pump compressor are involved, and hand the rest to a qualified technician.
- Turn off the cooktop and wipe the touch surface completely clean and dry.
- Clear any boil-over or grease film from around the keys.
- Power the cooktop off at the breaker for a minute, then restore.
- If F3 persists on a clean, dry panel, leave it for service.
Parts a technician may replace
Depending on what the diagnosis shows, a technician may inspect, test, or replace the touch control panel, touch sensor, and control board. The correct part for your LG Cooktop is matched from the model and serial number, and genuine LG components are fitted rather than generic substitutes so that performance, safety, and the appliance’s long working life are all protected. Confirming the failed part before ordering avoids replacing more than the fault actually requires.
When to call a technician
F3 that stays on a clean, dry panel needs a technician to test the touch panel and control board. When the fix calls for trained service, book a visit through our scheduling page and an experienced, qualified technician will diagnose and repair it. For manufacturer documentation and model lookup, see the manufacturer at lg.com/us.
Prevention and care
Regular care keeps this condition from returning on your LG Cooktop. Keep filters, vents, and the condenser or exhaust path clean, avoid overloading or blocking airflow, check that doors and seals close cleanly, and follow the LG maintenance guidance for your model. Because this unit relies on electronic control, protect it with a stable, correctly rated power supply and have any built-in or laundry installation done to LG specification so the control never sees an out-of-range condition. If a code appears, note exactly what was shown before you reset the appliance — that record helps the technician reach an accurate diagnosis and avoid replacing parts unnecessarily.
Related help and LG resources
Browse other LG Cooktop diagnostics, read about professional LG Cooktop repair, look up your unit in the LG models reference, or the related F33 induction sensor fault, or schedule a service visit. For LG manufacturer documentation and model lookup, visit the manufacturer at lg.com/us.
