Step-by-Step DIY Fix Guide
- SAFETY: Disconnect power at the breaker before attempting any fan-area inspection.
- Restore power once and run a short normal bake test rather than a self-clean cycle.
- Listen for the cooling fan during operation, especially near the top-rear control area.
- If the fan does not come on or F27 returns, stop using self-clean and high-heat functions.
- Use your exact model documentation before opening any oven panels or ordering fan parts.
If F27 returns after reset
- A repeat F27 after a clean reset usually points to the fan motor or wiring rather than a one-time control glitch.
- If the oven bakes but the fan stays silent, the cooling path still is not doing its job even if heat is being produced.
- If the code appears only with self-clean, the fault may still be real because that is when the cooling fan is under the most stress.
What This Error Means
LG oven error F27 means the cooling fan that protects the control section is not operating as expected. That makes this page more about safe heat management than about cooking performance alone.
The first sensible step is still a full power reset and a short non-self-clean bake test. If the fan never comes on, the issue is more likely to be the fan motor or its wiring than a one-time software glitch.
Because the cooling fan protects the controls during high heat, repeated F27 is a good reason to avoid self-clean until the fault is resolved.
Most Likely Cause by Symptom
The oven cancels self-clean or shows the code during higher-heat use.
Likely cause: The cooling fan is not protecting the control section properly.
Check first: Avoid self-clean and do a short normal bake test to confirm whether the fan starts at all.
The code returns after a reset and the fan is still not audible.
Likely cause: The fan motor or wiring is failing rather than a simple software glitch.
Check first: Stop using high-heat functions and arrange service.
Common Causes
- The cooling fan motor is stalled or failing.
- Debris is obstructing the cooling fan blade.
- The fan wiring or connector is damaged or loose.
- The control board is not energizing the cooling fan correctly.
What Not to Do
- Do not run self-clean again while F27 is unresolved.
- Do not ignore repeated cooling-fan faults just because normal baking still seems possible.
- Do not keep forcing resets if the fan never starts.
Model and Display Variation Notes
Model-family notes
- Cooling-fan layout varies by LG oven family, but F27 still points first to the fan path that protects the control section.
- This is different from a simple temperature-sensor fault because the main risk is overheating around the controls during high heat.
Display and panel differences
- Panel wording can vary by series, so confirm the exact code pattern before buying parts.
Parts, Tools and Service Options
Common parts
- Cooling fan motor if motor has failed ($20–$60)
Manual and model check
Check your exact model and manual before ordering any LG oven parts.
Service option
Service visit if F27 returns after a reset or the cooling fan never starts.
Suggestions in this section are organized to support the troubleshooting flow first. Any future affiliate relationships should be disclosed clearly.
When Not to Keep Troubleshooting
F27 returns after a full power reset.
- The cooling fan never comes on during a short bake test.
- You suspect a failed fan motor, wiring issue, or control-side fan problem.
How to Prevent It Recurring
- Ensure there is adequate clearance above the range and no obstruction in the oven's ventilation slots — restricted airflow causes the cooling fan to overwork
Related Error Codes
F7
The convection fan in the upper oven cavity is not running at the expected speed or has stalled. Convection mode will not work correctly, but standard bake may still function.
F17
The oven's convection fan is not providing the expected speed feedback signal to the control board. The fan may be running slowly, stalling intermittently, or the feedback sensor has failed.
F11
The oven's display/control panel and the main control board have lost communication. The two boards cannot exchange data, so the oven cannot accept commands or display status correctly.
Extra notes
- This page is based on LG support material and stays conservative where model-specific guidance may vary.
- The goal is to help you identify safe first checks before you move into parts, service, or model-specific manual lookup.
Source and model notes
Last reviewed: 2026-04-08
Based on: Based on LG oven cooling-fan guidance and edited to help users separate a one-time reset issue from a real fan-path fault.
Model coverage note: Cooling-fan access and control layout vary by LG oven family, so use this page as a safe first-pass guide rather than a model-specific service manual.
Important: FixThisError is an independent guide, not the manufacturer. Use your model-specific manual when the panel wording or behavior differs.
Always disconnect power before inspecting appliances. If unsure, contact a licensed appliance technician.