LG Range Error Code E-27

E-27 means the oven temperature sensor has an open circuit, with resistance measuring above 40,000 ohms. The control board cannot read a valid temperature signal from the sensor, so it shuts down oven operation and displays the error. The sensor should normally read approximately 1,080 ohms at room temperature. This error requires diagnosis of the sensor and its wiring before the oven can be used again.

Resetting the range by disconnecting power may temporarily clear the error display, but E-27 will return as soon as the control board attempts to read the sensor again. The underlying open circuit condition must be repaired for the error to stay cleared. A reset alone is not a fix.

If only the oven temperature sensor needs replacement, parts typically cost in the range of $20 to $60 depending on the specific model. If you hire a technician, expect to pay an additional $75 to $150 or more in labor. If the wiring harness or control board is also damaged, total repair costs will be higher and a technician can help determine whether repair or replacement makes more financial sense.

Yes, this is a repair many experienced DIYers can handle. After disconnecting power, remove the upper rear cover panel and use a multimeter to test the sensor resistance. If the sensor reads open or far above 1,080 ohms, replacing the oven temperature sensor typically resolves the error. If the sensor tests correctly, inspect the wiring harness and connectors for damage before assuming the control board is at fault.

You should not use the oven while E-27 is active. The control board cannot monitor oven temperature without a functioning sensor, which means it cannot regulate heating elements properly. This creates a risk of overheating. Surface burners on a gas or electric range may still function, but the oven should remain off until the sensor circuit is repaired.