LG Oven Error Code F9

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 10, 2026

⚠ High Severity 🔧🔧🔧 Advanced DIY

Control board failure — internal fault

The most common cause of the F9 error on a LG oven is control board internal component failure (~55% of cases); start with: power cycle the range.

💰 DIY cost: $150–$380 👨‍🔧 Pro cost: $280–$550 Save $130+ by doing it yourself

LG Oven error code F9 on the display panel — How the F9 code appears on a LG oven display

What Does Error Code F9 Mean on a LG Oven?

Control board failure — internal fault.

F9 fires when the electronic range control's self-diagnostics detect an internal fault it cannot recover from — a failed onboard component, a stuck relay, or corrupted control logic — often traceable to a prior power surge or simple aging. Unlike sensor-specific codes (F1/F3 point to the oven temperature sensor circuit), F9 flags the board itself rather than an external part, so the oven may stop heating, ignore keypad inputs, or shut down mid-cycle.

Models affected: LG electric and gas ranges with an electronic range control (ERC), including models such as LREL6325F and LRGL5825F

What owners report: Owners commonly report F9 appearing suddenly after a storm or power flicker, sometimes as a one-time glitch that clears with a breaker reset. When it keeps returning after a full reset and reseated harnesses, most find the control board itself has failed and needs replacement.

What Causes Error Code F9?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

1

Control board internal component failure 55% of cases
2

Power surge damage 25% of cases
3

Age-related board failure 15% of cases
4

Loose harness at the ERC 5% of cases

How to Fix LG Oven Error Code F9

🔧🔧🔧 Advanced DIY Est. time: 1–3 hours

⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.

1

Power cycle the range

Turn the oven breaker off for 15 minutes to reset the ERC, then restore power and test bake briefly.
2

Reseat control harnesses

With the breaker off, access the control area and reseat the ribbon and multi-pin harnesses at the ERC.

⚠️ Photograph all wiring before disconnecting.
3

Replace the control board

If F9 returns after reset and reseating, replace the ERC/control board matched to the exact model.

🔩 LG oven control board ($150–$380)

How to Reset Error Code F9

Turn the circuit breaker off for 15 minutes, then restore power and run a short bake test; if F9 returns after a full reset and the harnesses are seated, the ERC/control board has failed and needs replacement.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

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When to Call a Professional

Call a technician for recurring F9, because control board replacement involves high-voltage oven wiring, exact part matching, and verification that no stuck relay or harness fault will damage the new board.

Average professional repair cost for this issue: $280–$550

Same Code on Other Brands

Error code F9 appears on these other brands too. See every brand that shows F9 →

Whirlpool Oven F9

Door latch fault — self-clean lock circuit

GE Appliances Oven F9

Door latch failure — self-clean lock not completing

Find Replacement Parts

Use these links to find the exact replacement parts for your LG Oven:

Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More LG Oven Error Codes

F11 Heat error — oven failed to reach temperature in time F19 Temperature sensor error — sensor or wiring fault HS Hot Surface indicator — surface still hot (not a fault) PF Power failure — unit lost power during operation (not a fault) Sb Sabbath Mode active — controls intentionally disabled (not a fault) F1 Oven temperature sensor open circuit

Frequently Asked Questions

Can I keep using my LG Oven when error F9 appears? +

It is not advisable. The oven may still power on, but running it while F9 is active can worsen the control-board fault or damage related parts. Treat it as a soon-as-possible repair.

What most commonly causes F9 on a LG Oven? +

Across reported LG oven repairs, the most frequent is control board internal component failure (55% of cases), power surge damage (25%), then age-related board failure (15%). Check them in that order before replacing any parts.

F9 keeps coming back after a reset — what should I check next? +

A reset only clears the stored F9 fault; if it returns, the control-board problem is still present. Move on to the physical checks — power cycle the range, then reseat control harnesses — since the code will reappear until the root cause is resolved. This is an advanced repair involving deeper disassembly or electrical testing.

How much does it cost to fix LG Oven error F9? +

A DIY repair typically runs $150–$380 in parts, versus $280–$550 for a professional service call, so handling it yourself saves around $130. Expect the work to take 1–3 hours.

Which LG Oven models show error F9? +

F9 is documented on LG electric and gas ranges with an electronic range control (ERC), including models such as LREL6325F and LRGL5825F. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

• LG Support — Help Library — official manufacturer documentation
• Our editorial & verification policy

Content verified against manufacturer service documentation. Last verified: June 10, 2026.

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