Oven Not Heating? How to Diagnose and Fix Common Oven Problems
An oven that won't heat up, heats unevenly or doesn't reach the set temperature is a frustrating problem that disrupts cooking and meal preparation. Many oven faults have simple causes that can be diagnosed at home before calling a technician. This guide walks through the most common oven heating problems and their solutions.
Safety Warning
Before inspecting any oven components, ensure the oven is switched off at the power point and, for gas ovens, that the gas supply valve is off. Never attempt to access internal oven components while power is connected.
Electric Oven Not Heating
Check the Power Supply
Electric ovens draw significant current and are usually wired to a dedicated 20-amp circuit. If the oven isn't heating at all:
- Check the circuit breaker in your switchboard — a tripped breaker is a common cause
- Check that the oven is switched on at the power point
- Check that the oven clock/timer hasn't been accidentally set to "manual" or a delayed start time (many ovens won't heat unless the timer is set correctly)
Timer and Clock Settings
Many electric ovens require the clock to be set before the oven will operate. After a power outage, the clock resets and the oven may appear dead until the clock is set. Check the manual for your specific model for the clock-setting procedure.
Faulty Bake or Grill Element
If the oven heats on grill but not bake (or vice versa), one of the heating elements has failed. Visual inspection often reveals the fault — a failed element may show burn marks, blistering or a visible break. Element replacement is a moderate-difficulty DIY repair for confident home repairers, or a straightforward job for a technician.
Faulty Temperature Sensor
If the oven heats but to the wrong temperature (food burns or is undercooked), the temperature sensor (a thin rod inside the oven cavity) may have failed. Test: set the oven to 180°C and use an oven thermometer to check actual temperature. A reading more than 15°C off indicates a faulty sensor or calibration issue.
Gas Oven Not Heating
Check the Gas Supply
Ensure the gas meter isolation valve is open and other gas appliances (like the cooktop) are working. If the cooktop burners also don't light, there may be a gas supply issue.
Faulty Igniter
Gas ovens use an igniter to light the gas. A failing igniter may not provide enough heat to open the gas valve, so gas doesn't flow to the burner. Symptoms: the oven clicks but doesn't light, or takes much longer than usual to light. The igniter glows orange when functioning correctly — if it glows but the oven doesn't light, the igniter may be too weak to open the safety valve.
Faulty Thermostat
A faulty thermostat will prevent the oven from reaching or maintaining temperature. This is a technician repair.
Oven Heats Unevenly
Uneven heating (food browns on one side only, or the oven is hotter at the top or back) can be caused by:
- A faulty fan in a fan-forced oven
- A partially failed heating element
- Incorrect rack position for the dish being cooked
Try baking at a rack position in the centre of the oven with the fan on. If a fan-forced oven heats unevenly with the fan running, the fan motor may be failing.
Repair or Replace?
If your oven is more than 10 years old and repair costs exceed $400, replacement is often the better value decision. Oceania Appliances stocks a wide range of freestanding ovens and built-in ovens in both new and quality-refurbished condition with 3-month warranty. Free delivery across Sydney. Visit 2/14 Centre Place, Wetherill Park (open 7 days, 10am–8pm), call or WhatsApp 0422 489 492.