Oven Not Heating to the Right Temperature? How to Diagnose and Fix It
An oven that runs too hot or too cold is frustrating and affects cooking results. Learn to test and replace the temperature sensor yourself.
Why Ovens Run Too Hot or Too Cold
The most common cause of oven temperature inaccuracy is a failing oven temperature sensor (RTD probe or NTC probe). When this sensor degrades, it sends incorrect readings to the control board, causing the oven to overshoot or undershoot the set temperature.
How to Confirm It's a Temperature Problem
Purchase an independent oven thermometer ($10–$15 at hardware stores). Set the oven to 350°F, let it preheat for 20 minutes, then check the thermometer reading. If it's off by more than 25°F, there's a calibration or sensor issue.
Step 1: Check if Calibration Can Be Adjusted
Many ovens have a built-in calibration offset in the settings menu (usually ±35°F). Check your owner's manual.
Step 2: Locate and Inspect the Temperature Sensor
The sensor is a thin probe visible on the back interior wall of the oven, typically at the top. Check for:
Step 3: Test the Sensor with a Multimeter
Unplug the oven. Disconnect the sensor connector. Test resistance:
Step 4: Replace the Sensor
Oven temperature sensors are inexpensive ($15–$40) and simple to replace: