LG Range Error Code F27

The F27 error code on an LG range indicates a stalled fan sensor error tied to the cooling or convection fan system. The control board begins monitoring fan behavior once the oven cavity temperature reaches 115 degrees Fahrenheit. If the temperature rises by 12 degrees or more within a 10-minute window after that monitoring threshold is crossed, the control interprets this as evidence that the fan has stalled or stopped moving air effectively. A functioning fan should be keeping temperatures stable or reducing them during the monitoring period, so a continued rise of that magnitude signals a failure in airflow.

The most likely hardware culprits are the fan motor itself, the fan sensor, or the wiring connecting these components to the control board. A seized or sluggish fan motor will fail to circulate air, allowing heat to build unchecked. The fan sensor may also be at fault if it is sending inaccurate readings to the control board or has developed an open or short circuit. Wiring issues such as loose connectors, burnt terminals, or broken harness segments can prevent proper signal transmission between the sensor and the board.

Diagnostic work should begin with a visual inspection of all wiring and connectors associated with the fan circuit. Look for heat damage, fraying, or disconnected plugs near the fan assembly. After confirming wiring integrity, test the fan motor for proper operation by checking that it spins freely and runs when power is applied. If the motor and wiring check out, the fan sensor itself should be evaluated for correct resistance and continuity values. Replacing the faulty component is typically required to fully resolve this error.