Oven not heating evenly
easy 30–90 min
Tools: oven thermometer, screwdriver, flashlight, multimeter (optional) · Materials: bake element for the model, door gasket, temperature sensor
Steps
- Hang an oven thermometer in the centre, set 180 °C (350 °F), and read it after 20 minutes and again at 40; a steady reading 15 °C off is calibration, a swinging one is the sensor or element.
- Look at the bake element with the oven on: it should glow evenly along its length. A dark section, a blister or a break means the element has failed and needs replacing.
- Check the door seal by closing the door on a sheet of paper at several points; if the paper slides out easily anywhere, the gasket is letting heat out on that side.
- Listen for the convection fan and check it spins freely; a jammed or squealing fan leaves hot and cold zones.
- Recalibrate: most ovens have an offset setting in the control menu — adjust it by the difference the thermometer showed.
- Use the middle rack and leave space around dishes; a tray touching the back wall blocks airflow and cooks unevenly regardless of the oven.
Stop and call a pro if
- the element sparks or has a burnt spot — switch off at the breaker
- the oven is gas and the flame is uneven, yellow or lifts off the burner
- the temperature swings more than 25 °C (45 °F) after recalibration — the sensor or control board is failing
What a pro does that you can't
An appliance technician tests the sensor's resistance, replaces a failed element or control board, and adjusts a gas oven's burner and igniter so the temperature holds across the cavity.
DIY cost: $20–60 for an element or gasket; $10 for a thermometer