Oven Temperature Wrong? When to Calibrate and When to Repair

Published October 19, 2026 · By Elchin Hasanzade, Founder · Reviewed by Fuad, Tech Lead

Every oven is a little wrong. A 25-degree swing above and below the set point during a bake is normal cycling, and a consistent offset of 10 or 15 degrees is common from the factory. What is not normal is an oven that reads 350 and bakes like 300, one that takes 40 minutes to preheat, or one that is right at low temperatures and wildly off at high ones. The first two can usually be fixed from the control panel; the third pattern points to a part.

Measure before you adjust

Hang a decent oven thermometer from the center rack, set the oven to 350, and wait a full 20 minutes after the preheat beep - most ovens signal preheat early. Read the thermometer every five minutes for the next 20 minutes and note the high and low. A range of 325 to 375 centered on 350 is normal. A range centered on 320 is an offset you can calibrate. A range of 60 degrees or more, or a reading that keeps climbing, is a control or sensor problem.

Using the built-in calibration

Almost every electronic oven has a hidden calibration adjustment, usually reached by holding the Bake button for a few seconds until a number appears, then adjusting up or down in 5-degree steps to a limit of 35 degrees either way. GE, Whirlpool, KitchenAid, Frigidaire and Samsung all use some version of this; the owner's manual has the exact sequence. Set the offset to the difference you measured, let the oven cool completely, and test again. If you have to push the adjustment to its limit to get close, the oven has a real fault that calibration is only masking.

The temperature sensor

The thin metal probe sticking into the oven cavity from the back wall is a resistor whose value rises with temperature. The control reads it to decide when to cycle the element. As sensors age their resistance drifts, and an oven starts running hot or cold across the board; when one fails outright the display shows an F-code - F2, F3, F30 and F31 are common across brands - or the oven simply will not heat. A technician checks the sensor with a meter against a known resistance at room temperature. It is an inexpensive part and a quick swap, and it fixes more temperature complaints than anything else.

Elements, igniters and uneven heat

An oven that is accurate at 300 but cannot reach 450 has a weak heat source. On an electric oven, a bake element that glows unevenly, has a visible blister, or stays dark in sections is failing; on a gas oven, an igniter that glows for more than a minute before the burner lights is too weak to open the gas valve fully and the oven cycles slowly and runs cool. Both are covered in our guide to an oven that is not heating or heating unevenly. A convection fan that has stopped turning also produces hot and cold zones that look like a temperature problem.

The control board and relays

If the sensor tests good, the element or igniter is strong and the oven still overshoots or undershoots badly, the fault is in the control board's relays that switch power to the element. A stuck relay produces an oven that keeps climbing past the set point - a safety issue, since the oven may not stop heating until the thermal cutout trips. Turn such an oven off at the breaker and book service rather than keep using it.

What a repair visit involves

A technician measures the actual cavity temperature, checks the sensor resistance, inspects the element or igniter under load and reads the fault history from the board, then quotes the repair before doing anything. Most temperature repairs (sensor, element, igniter) are routine jobs: labor starts at $200 and stays there on about 9 in 10 repairs, and the part is listed separately in the quote. A control board costs more, and on a 15-year-old range it is worth a repair-or-replace conversation. Book oven repair with the model number from inside the drawer or door frame, and mention whether the problem is a steady offset or a wild swing - it changes what parts come on the truck.

Related reading: Oven Not Heating or Heating Unevenly? Causes and Fixes

Book appliance repair

Need a technician? Oven repair is available across D.C., Northern Virginia and Maryland, including Washington, DC, Vienna and Bethesda. The $75 diagnostic visit is credited toward the repair.

We also provide oven repair in Fairfax, VA, oven repair in Rockville, MD, oven repair in McLean, VA and oven repair in Springfield, VA, with the same 7-day schedule and 90-day warranty.