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LG range or oven code F27: meaning and exact next steps

F27 means a Cooling Fan Stalled or Locked During Self Clean — LG's own wording. This answer applies only to LG electric and gas ranges and wall ovens. LG documents radiant-cooktop codes separately in the same article; griddle, induction and sous-vide codes apply only to models with those features.

On the covered LG range or oven, F27 means a Cooling Fan Stalled or Locked During Self Clean — LG's own wording. First, note whether a self-clean cycle was running. Then: when F27 appears LG says to press CLEAR/OFF and then, if it reappears, to cycle the breaker off for 30 seconds before using the oven again — LG's own sequence.

Part of LG range or oven error codes

Differential

Likely causes of “LG range or oven code F27”, and how to tell them apart

  1. 1

    A cooling fan stalled or locked during self-clean

    What separates it F27 shows during or after a self-clean

    How to confirm LG says F27 is a cooling fan stalled or locked during self-clean

  2. 2

    Dust or debris stopping the fan

    What separates it The fan does not spin

    How to confirm Service cleaning

  3. 3

    A fan motor that has failed

    What separates it No fan sound during the cycle

    How to confirm Service replacement

  4. 4

    Vents blocked near the oven

    What separates it The oven runs hot

    How to confirm Clear the vents

  5. 5

    A glitch

    What separates it The code clears after a reset

    How to confirm Do not start another self-clean until it is checked

Before you touch a setting

Record this first — changing settings destroys the evidence

  • Whether the oven was in a self-clean cycle
  • Whether a fan could be heard
  • Whether the door is locked

Try in this order

0 of 6 completed

  1. What to do first

    Reversible

    Note whether a self-clean cycle was running.

  2. Correct only the documented fault domain

    Reversible

    When F27 appears LG says to press CLEAR/OFF and then, if it reappears, to cycle the breaker off for 30 seconds before using the oven again — LG's own sequence.

  3. Let the oven cool

    Reversible

    Fully.

  4. Do not restart self-clean

    Reversible

    Until it is checked.

  5. Press CLEAR/OFF

    Reversible

    And wait.

  6. Clear the vents

    Reversible

    Near the oven.

Model-specific

What is true of this model and not of its siblings

Why the fan matters
During self-clean the oven runs far hotter than in baking. A cooling fan moves air through the range to protect the electronics and the surrounding cabinets.
What the control does
If the fan does not turn as expected, the control stops the cycle and shows F27.
The door
The door stays locked until the cavity is cool.
Before restarting
Do not repeat the cycle until the fan has been checked.
Preparing for self-clean
Remove racks and loose soil, and keep the area clear.
Service
The technician checks the fan and wiring.
What self-clean asks of the range
A self-clean cycle takes the oven far above any cooking temperature, commonly for two to four hours, to burn soil to ash. The oven's insulation and a cooling fan keep the outside of the range, the control panel and the cabinets either side within safe limits. Because the stakes are higher than in a bake, the control treats a fan problem during self-clean seriously and ends the cycle, which is the F27 you see. It is a protective response, so the oven is doing its job.
What to do straight away
Let the oven cool on its own with the door closed, and do not try to open a locked door. Open a window if the cycle left smoke, and keep pets and children away from the range until it is cool. When the lock has released, wipe the cavity and look at the racks. If you smelled hot electronics or saw smoke from the control panel rather than the cavity, switch off at the breaker and call for service at once.
Why you should not repeat the cycle
A second self-clean while the fan is still faulty repeats the same stress, and it can damage the electronics the fan was protecting. Use hand cleaning with a cleaner approved for your oven until the fan has been inspected, and tell the technician that F27 appeared during a self-clean so that they test the fan under load.
Preventing a repeat
Clear grease and heavy spills before you run a self-clean, since heavy soil makes more smoke and heat. Keep the area behind and beside the range open to air, and do not store items on or near the vents on the back of the range.

Evidence ledger

Sources behind this answer

01
LG USA Support LG Range — Error Codes List

Exact questions

Common questions

What does F27 mean on a LG range or oven?+

a Cooling Fan Stalled or Locked During Self Clean — LG's own wording.

Can I bake?+

Often yes, but get it checked.

Will the door unlock?+

After the oven has cooled.

Wrong device or version?

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