Your Oven Says 350 and It Is Not 350: Calibrating an LG

LG oven temperature calibration: measure first, everything depends on it

Almost every conversation about oven temperature starts with an adjustment and should start with a measurement.

Put an oven thermometer — a real one, on the middle shelf, in the middle of the cavity. Set the oven to 350°F. Then leave it for a full thirty minutes.

Not fifteen. Not "when the preheat beeps." An oven reaches its set point at the sensor long before the walls and the racks have caught up, and a reading taken at the end of preheat tells you about the air near the sensor rather than about the oven you cook in.

After that half hour, take three readings spread across another thirty minutes.

Reading the three numbers

310, 312, 308. Three readings clustered around the same wrong figure. The oven is measuring slightly low and then holding exactly what it measures — which is obedience rather than failure. This is what the calibration offset exists for.

320, 400, 340. Three readings that wander. The oven is losing its measurement intermittently, and no offset can correct something that is not consistent. That is the temperature sensor, and it is a part rather than a setting.

The distinction matters because one of them costs nothing and takes five minutes, and the other is a visit.

Setting the offset

On most LG ovens the adjustment lives in the settings menu and allows roughly thirty-five degrees in either direction. The exact key sequence varies by model and by panel generation, so the manual for your own machine is the right source — but the principle is the same everywhere: you are telling the oven that its own reading is wrong by a known amount, and it applies that correction from then on.

Set it, then measure again using the same method. The point of the offset is a number you can verify, not a feeling that it seems better.

The free thing to check before either

Look at the temperature probe in the cavity. On most LG ovens it is a slim metal rod protruding from the back wall, usually near the top.

It should stand clear of the metal around it. A probe that has been knocked out of its clip — by a roasting tray going in at an angle, or by somebody cleaning — and is now resting against the cavity wall reads the wall rather than the air. The wall is hotter, so the oven thinks it is up to temperature sooner and runs cold.

Bending it gently back into position is free and it is a real cause.

What is not calibration

Uneven cooking front to back or top to bottom. That is elements, the convection fan, or a door that is letting heat out at one corner. LG codes convection fan problems as F7 and F17.

An oven that preheats very slowly. Usually a door seal or a hinge that has dropped. An oven is a box with one deliberately weak side, and a hinge that has sagged a few millimeters over ten years lets out more than people expect.

F-codes on the display. Those are conditions rather than drift, and the number carries a location: F1 and F2 are the upper cavity thermistor, F4 and F5 the lower one. On a double oven that saves opening the wrong cavity.

Why gas ovens swing more

If you have a gas oven and the reading moves twenty degrees either side of the set point, that is normal for the technology rather than a defect. A gas burner is either on or off, so the cavity is always overshooting slightly and then falling back. Electric ovens with a modern control cycle more gently.

What is not normal on either is a middle that keeps moving — a temperature that averages 350 today and 320 next week. That is drift, and it is worth measuring twice a year on an oven you rely on.