LG F2 — Oven sensor short / runaway high temperature on an LG wall oven — kill the breaker.

What F2 means (lg f2 error)

An lg f2 error on an LG wall oven signals a sensor short or a runaway high-temperature condition — the oven is heating beyond the safe setpoint. This is a safety fault: if the oven is overheating, switch it off at the breaker rather than waiting, then have the sensor and relays checked.

Symptoms to look for

The signs below help confirm you are dealing with this condition rather than a different fault on your LG Oven. 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 “F2” and heating may not stop
• The oven runs far hotter than set
• Food scorches or the cavity overheats
• The code often appears during a long bake or self-clean

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.

• Shorted RTD sensor — the sensor reads far too low a resistance
• Welded bake/broil relay — a relay stays closed and keeps heating
• Control fault — the board fails to cut element power
• Self-clean overshoot — a fault during the clean cycle

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.

1. If the oven is overheating, switch it off at the breaker immediately.
2. Let the oven cool fully before any further use.
3. Avoid self-clean until the cause is found.
4. Because over-temperature is a safety condition, arrange service before reuse.

Parts a technician may replace

Depending on what the diagnosis shows, a technician may inspect, test, or replace the oven temperature sensor (rtd), bake/broil relays, and control board. The correct part for your LG Oven 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

F2 needs a technician to test the RTD and the bake/broil relays and replace whichever is allowing the overheat. 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 Oven. 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. Where stored food, a sealed refrigerant system, gas, or a safety lockout is involved, treat the condition as a reason to act quickly rather than wait.

Related help and LG resources

Browse other LG Oven diagnostics, read about professional LG Oven repair, look up your unit in the LG models reference, or the related F1 sensor fault, or schedule a service visit. For LG manufacturer documentation and model lookup, visit the manufacturer at lg.com/us.