What to Do When Your Oven Is Not Heating Evenly

Uneven heating in an oven is one of the most frustrating kitchen appliance problems. One side of the cake is browned while the other is raw. The front of the tray is burnt while the back is underdone. Here's how to diagnose and fix the most common causes of uneven oven heating.

Common Causes of Uneven Heating

1. Fan Element Failure (Fan-Forced Ovens)

In a fan-forced oven, the fan element is a circular heating element wrapped around the fan at the back of the oven. If this element is partially failing, it creates uneven heat distribution. You can usually see visible damage (broken sections, burn marks) if you look at the element. A fully functional fan element should glow red evenly around its full circle when the oven is on.

Fix: Replace the fan element. This is a relatively straightforward repair that an appliance technician can do, or a confident DIYer can tackle with the correct element and the oven unplugged.

2. Faulty Oven Thermostat or Temperature Sensor

An oven thermostat that reads the temperature inaccurately will cause the oven to heat more on some cycles than others. The easiest way to check this is to use an independent oven thermometer (available from kitchenware shops) placed at different positions in the oven. Compare the readings to your set temperature.

Fix: If the oven consistently runs hot or cold by more than 10–15°C, the thermostat or temperature probe may need calibration or replacement. Some ovens allow thermostat calibration via the control panel — consult your manual.

3. Fan Motor Running Slowly or Intermittently

If the fan motor is wearing out, the fan may spin at reduced speed, resulting in poor air circulation and uneven temperatures. Listen for unusual noises from the fan during operation. A healthy fan should run quietly and consistently.

Fix: Replace the fan motor. An appliance technician can diagnose and replace this component.

4. Oven Is Not Level

An oven that's not perfectly level can cause uneven baking, particularly for liquid batters (cakes, quiches, slices) that flow to the lower side of the tin before setting.

Fix: Use a spirit level on the oven rack. Adjust the oven's levelling feet if the oven has them, or shim the cabinet.

5. Rack Position

Even a fully functioning oven heats differently at different rack positions. The top of the oven is hotter (heat rises), and the area directly above the bottom element is very hot. The fan helps equalise temperatures, but some variation always exists.

Fix: Use the middle rack position for even baking. For items that need browning on top, move to a higher rack for the last 10 minutes rather than starting high.

When to Repair vs Replace

If your oven is under 10 years old and the fault is a single replaceable component (element, thermostat, fan motor), repair is usually worthwhile. If the oven is older or the problem is in the control board or multiple components, a quality second-hand replacement is often better value.

Find a Replacement Oven at Oceania Appliances

We carry a wide range of tested, warranted second-hand and refurbished ovens in our Wetherill Park showroom. Free delivery across Sydney, 3–6 month warranty on all units. Contact us for stock and pricing.