F7
LG Oven
Severity: CriticalWhat Does This Error Mean?
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
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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.
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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.
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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.
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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.