LG Oven Temperature Sensor Replacement

How the RTD Sensor Works#

The sensor is a thin metal probe, about 6 to 8 inches long, that reaches into the upper rear of the cavity. Inside is a platinum or nickel wire whose resistance rises predictably with temperature, and the board reads that resistance to drive the elements. At a 72°F room it reads roughly 1,080-1,100 ohms; at 350°F, about 1,500-1,600 ohms.

Symptoms of Sensor Failure#

• An F3 error — the board sees the resistance outside its expected range (open, shorted, or far out of spec).
• The oven overheats — the sensor reads low, so the board keeps the element running.
• The oven never reaches temperature — the sensor reads high, so the board shuts the element off early.
• Temperature swings — an intermittent connection gives erratic readings.
• Self-clean never reaches full heat — a failed sensor stops the board driving the cavity past 900°F.

Testing the Sensor#

Cut power, reach the 2-wire sensor connector at the back of the oven, and set your multimeter to resistance:

At room temperature a reading well above 1,200, below 900, or infinite (open) means the sensor has failed.

Replacing the Sensor (EBG61285804)#

Disconnect power. Inside the cavity, find the probe in the upper rear corner, held by a single mounting screw. Remove the screw, gently pull the probe out as the wire feeds through the rear wall, and unplug the 2-pin connector at the back. Feed the new EBG61285804 through the wall hole, secure it with the screw, and reconnect the connector — the whole swap runs about 10 to 15 minutes. You will want a Phillips #2 for the mounting screw, a multimeter for testing, and a 1/4-inch nut driver if you reach the connector from the rear panel.

Afterward, check accuracy with an oven thermometer on the center rack. If the oven reads more than 15 to 20 degrees off, most LG ovens allow a calibration offset of about 35°F in the settings menu.

Don't Misdiagnose the F3 Error#

An F3 does not always mean a bad sensor. A broken wire between the sensor connector and the board produces the same error, so inspect the harness for damage — rodent chew and heat damage where the wire enters the rear wall are common — before you replace the probe.

Need help with your LG oven? EasyBear technicians carry OEM parts and diagnostic tools on every service call. Schedule service before the holidays.