LG Oven F7 Error — Temperature Runaway

What it means

LG oven F7 error means the oven detected a runaway temperature — it heated far above the set temperature.
Do not use the oven until the root cause (faulty sensor or relay) is found and fixed — temperature runaway is a fire risk.

Affected Models

LG Electric Range
LG Gas Range
LG LRE Series
LG LRG Series
LG Studio Range

Common Causes

Shorted oven temperature sensor sending a falsely low reading (oven heats without limit)
Failed control board relay stuck in the closed/on position
Faulty bake or broil element drawing power without control board command
Wiring short circuit between element and control board

How to Fix It

Stop using the oven immediately.

F7 means the oven is or was heating uncontrollably.
Do not run the oven again until the fault is identified and resolved.
Perform a power reset.

Turn off the oven at the circuit breaker for 5 minutes, then restore power.
If the sensor reading was temporarily corrupted, the F7 may not return.
Monitor closely.
Test the temperature sensor.

A shorted sensor (reading near zero ohms instead of ~1,000 ohms) tells the control board the oven is cold, so the board keeps the element on without limit.
Test the sensor with a multimeter — a near-zero reading means it is shorted and must be replaced.
Inspect the control board relay.

If the sensor tests correctly, the issue is likely a relay on the control board stuck in the closed (on) position.
This requires board-level diagnosis or replacement — have a technician assess this.

When to Call a Professional

Temperature runaway is a serious safety issue.
If a power reset and sensor replacement do not resolve F7, do not use the oven — call a qualified appliance technician to inspect the relay board and wiring.

Frequently Asked Questions

Is F7 dangerous — can my LG oven catch fire?

Temperature runaway is a serious condition. An oven heating uncontrollably is a genuine fire risk, especially with food or grease inside. Do not ignore F7 — resolve the fault before using the oven again.

LG oven shows F7 during self-clean — is that the same issue?

During self-clean the oven operates at very high temperatures (up to 480°C / 900°F). An F7 during self-clean may indicate the temperature genuinely exceeded the safe limit, or the sensor is shorted. Stop the cycle, allow the oven to cool, and test the sensor.