F27 Serious Moderate DIY

LG Oven F27 — Cooling fan stalled during self-clean

LG Oven · Error code F27

What F27 Means

The cooling fan (which protects the controls during self-clean) is not detected running for more than one minute, so the control aborts the cycle and locks out further heat until cleared.

Symptoms

  • F27 or F-27 on display during or after self-clean
  • Oven exterior or control panel got unusually hot
  • No fan noise from the top vent
  • Self-clean cancels partway through

Common Causes

1
Seized cooling fan motor

Bearings or motor windings failed.

2
Obstruction blocking the fan

Insulation or debris jammed the blade.

3
Loose or burned harness at the cooling fan

Connector dropped voltage.

4
Failed cooling fan relay on main control board

Board commands fan on but contacts never close.

How to Fix It

  1. Let the oven cool fully — the cavity can stay over 500°F well after F27 trips.
  2. Power off at the breaker for 60 seconds.
  3. Pull the top control panel/back panel and locate the cooling fan; verify the blade spins freely with no obstructions.
  4. Reseat the fan harness at the fan and at the main PCB.
  5. With power restored and the oven calling for the fan, measure voltage at the fan plug; if voltage is present and the fan does not run, replace the cooling fan motor.
  6. If no voltage at the fan plug, replace the main control board.

Parts You May Need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

Common replacement LG oven cooling fan motor View on Amazon→

More LG Oven Codes

5b 5b — Sabbath Mode active (not a fault) CF1 CF1 — Left-front cooktop sensor open/short CF2 CF2 — Left-rear cooktop sensor open/short CF3 CF3 — Right-front cooktop sensor open/short CF4 CF4 — Right-rear cooktop sensor open/short F1 Range F1 — Upper Oven Thermistor Error

All LG codes → All oven codes →

Verified against manufacturer documentation: lg.com

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician.