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LG·ovenhigh severity
LG Error Code F1
Shorted key / relay protection loss
Common Causes
- 1Keypad wiring issue
- 2Control PCB failure
F1 indicates a loss of safety relay monitoring. Do not attempt to operate the oven. Turn off the circuit breaker and do not restore power until the control board is replaced by a qualified technician. On gas models, also close the gas supply valve.
Step-by-Step Troubleshooting
- 1
Turn off the oven circuit breaker immediately — F1 indicates a safety relay monitoring failure on the control board
- 2
After 10 minutes, restore power and observe whether the oven attempts to heat without any button input — if it does, the relay is stuck closed and the unit is unsafe
- 3
Disconnect the bake and broil element wire leads at the control board before restoring power to safely test the board response
- 4
If F1 persists with heating elements disconnected, the control board relay circuit has failed and the board must be replaced
- 5
On gas models, F1 may indicate the gas safety valve relay circuit has lost monitoring capability
Pro Diagnostic Tip
F1 is a safety-critical code. Unlike other fault codes, LG ovens with F1 should not be operated at all until repaired. The relay protection circuit prevents the oven from heating uncontrolled — if this circuit fails, the oven could heat with the door open and no user input.
You Might Also Notice
- •Oven heating without input
- •Display showing F1 immediately on power-up
- •Oven will not respond to any controls
- •Burning smell when oven is supposedly off
Parts, Cost & Difficulty
Repair Difficulty
Professional OnlyEstimated Repair Cost
$200–$380
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
EBR84433508 (Oven Control Board)EBR84433510 (Keypad Assembly — if shorted key variant)
Do You Have the Right Tools?
Combustion analyzer ($300), igniter tester ($120), temperature calibrator ($150), and gas pressure manometer. Our technician arrives with $15K+ in professional tools — your diagnostic is free.
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Safety First — Know the Risks
Gas ovens involve live gas lines — a loose connection creates explosion and carbon monoxide risk. Electric ovens run on 240V circuits. Our techs are licensed and insured — let them handle the risk.
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Get Professional Help Now
Error code F1 is a high-severity issue that can cause further damage to your oven if left unresolved. A licensed technician can diagnose and fix it the same day.
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Frequently Asked Questions
What does LG error code F1 mean?
LG error code F1 indicates: Shorted key / relay protection loss. This is a high-severity issue affecting your oven.
How do I fix LG error code F1?
Turn off the oven circuit breaker immediately — F1 indicates a safety relay monitoring failure on the control board Then, After 10 minutes, restore power and observe whether the oven attempts to heat without any button input — if it does, the relay is stuck closed and the unit is unsafe Then, Disconnect the bake and broil element wire leads at the control board before restoring power to safely test the board response There are 2 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my oven has error F1?
Besides the error code on the display, common signs include: Oven heating without input; Display showing F1 immediately on power-up; Oven will not respond to any controls. If you notice any of these symptoms, check your oven's display panel for error code F1.
How much does it cost to fix LG F1?
Repair costs for LG F1 typically range from $200 to $380 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.