Your oven heats unevenly. One side of your baking tray browns faster than the other. Or it’s not reaching temperature at all. Or the interior smells strange.
These aren’t minor inconveniences. An oven that doesn’t work properly makes cooking unreliable and wastes energy. Unlike some appliances you can ignore for a while, a faulty oven affects daily life. Knowing when to troubleshoot yourself versus when to call a professional saves time and money.
Quick Troubleshooting Guide
| Problem | Most Likely Cause | Try This First | Call a Pro When |
| Not reaching temperature | Faulty heating element or thermostat | Check power (electric) or gas supply (gas) | Still not heating after checking supply |
| Uneven heating | Dirty interior or misaligned racks | Clean oven; ensure racks are level and seated | Still uneven after cleaning and repositioning |
| Taking longer to heat | Partially failed element or dirty interior | Clean the oven; run at normal temperature | Heating time doesn’t improve after cleaning |
| Strange smells (burning, electrical) | Food residue, dust, or electrical fault | Run empty oven at 200°C for 15 min | Smell persists – stop using oven and call |
| Temperature fluctuations | Faulty thermostat or sensor | Check with separate oven thermometer | Actual temp doesn’t match display by 10–15°C+ |
Not Reaching Temperature
You set the oven to 180°C. You wait. The interior barely gets warm.
Check first:
- Confirm the power switch is engaged and the setting is correct
- For gas ovens: gas supply is turned on at the valve
- For electric ovens: circuit breaker hasn’t tripped
If supply is confirmed and the oven still won’t heat, the heating element is likely failing. A heating element can burn out completely (no heat at all) or fail partially (heats slowly or inconsistently). You can’t repair a heating element – it needs replacement.
For gas ovens, a faulty ignitor is another possibility. If you hear clicking but see no flame, the ignitor has likely failed.
| Component | Typical Replacement Cost |
| Heating element (electric or gas) | $150–$300 |
| Gas ignitor | $150–$250 |
Uneven Heating
One side of your tray browns quickly; the other barely cooks. Or food on the left heats while the right stays cool.
Try these first:
- Clean your oven – buildup inside can block heat distribution
- Check rack placement – racks should sit fully on their supports; a partially unseated rack affects heat distribution in that area
- Centre your food – food placement affects how heat reaches it
- Use an oven thermometer – place it in the centre for 15 minutes at 180°C. If the thermometer reads more than 10–15°C different from the display, the thermostat or temperature sensor has failed
If uneven heating persists after cleaning and repositioning, part of the heating element is degrading. One section heats less than the rest. A new element solves this.
In some cases, the thermostat itself is failing – causing the oven to heat unevenly as it cycles on and off inefficiently. A technician can identify which component is the fault.
Taking Longer to Heat
Your oven used to reach 180°C in 10 minutes. Now it takes 15–20 minutes. Or you preheat, put food in, and realise the oven wasn’t actually hot enough yet.
A partially degraded heating element heats more slowly – still functional, but not at full capacity. You’ll also notice increased energy consumption as the element runs longer to reach the same temperature.
Clean the oven interior first. Buildup insulates the interior, making the element work harder. If the oven still heats slowly after cleaning, the element is likely degrading. Replacement restores energy efficiency and stops the problem.
Strange Smells From the Oven
| Smell | When | What It Means |
| Burning (first use of new oven) | Only on first run | Normal – interior coating curing. Open windows and run empty at 200°C for 15 min |
| Burning (established oven) | During normal use | Food residue or grease burning off – run empty at 200°C for 15 min |
| Electrical / acrid smell | During normal use | Stop using immediately. Electrical fault – call a technician. |
| Gas smell (gas oven) | During operation | Turn off immediately. Check gas connections. If leak detected, leave home and call the gas emergency line. |
Temperature Fluctuating or Not Accurate
You set the oven to 180°C, but food cooks unpredictably. It might be browning faster than expected, or taking much longer than the recipe says.
How to check:
- Place a separate oven thermometer in the centre of the oven
- Set to 180°C and let it stabilise for 15 minutes
- Compare thermometer reading to the oven display
If the actual temperature differs from the display by more than 10–15°C, the thermostat or temperature sensor has failed. The oven can’t maintain consistent temperature. Cooking becomes unpredictable and energy is wasted.
Thermostat replacement typically costs $150–$300 depending on oven type.
When to Call a Technician
Call for professional service if any of these apply:
- The oven won’t heat at all after confirming power supply and settings are correct
- Heating element or thermostat failure is suspected based on the checks above
- Burning or electrical odours that don’t clear after running the oven empty
- You suspect a gas leak or gas connection problem – this is an emergency
- Temperature is significantly inaccurate and affecting cooking results
- The oven has been repaired multiple times in the past year
| Important: don’t attempt to open the oven yourself to inspect internal components. Modern ovens have components under tension that can cause injury. Let a technician handle internal diagnosis and repair. |
Maintenance to Prevent Problems
- Clean regularly to prevent buildup that blocks heat distribution
- Check rack seating – racks should be level and fully supported
- Avoid spilling food on heating elements (on applicable oven types)
- Annual inspection if your oven is over 8 years old – early detection of element or thermostat degradation prevents unexpected breakdowns
- Follow manual guidelines – don’t exceed maximum temperatures or use the oven for purposes it isn’t designed for
Repair vs. Replace: A Quick Guide
Repair makes sense if:
- Your oven is under 8–10 years old
- The problem is a single component (heating element, thermostat, ignitor)
- The repair cost is under 50% of a new oven’s price
Replacement is smarter if:
- Your oven is over 10 years old and needs a major repair
- It’s had multiple repairs in the past 18 months
- The repair cost exceeds 40–50% of a new oven’s price
- You’re ready to upgrade to a more energy-efficient model
Modern ovens have better temperature control and use less energy. The upfront cost of a new oven may be recovered through lower energy bills over its lifespan. Still unsure? Call us and a technician will give you an honest assessment before you decide.
Repair Cost Reference
| Repair Type | Typical Cost |
| Heating element replacement | $150–$300 |
| Thermostat replacement | $150–$300 |
| Gas ignitor replacement | $150–$250 |
| Labour | $50–$150 depending on complexity |
| Full diagnostic + repair (typical) | $200–$450 |
Frequently Asked Questions
My oven temperature doesn’t match my thermometer. Is it safe to use?
Not inherently dangerous, but unreliable for cooking – especially baking, where temperature accuracy is critical. If your oven is off by more than 20°C, get the thermostat checked. It likely needs recalibration or replacement. An inaccurate thermostat also wastes energy.
Can I fix a broken heating element myself?
No. Heating element replacement involves electrical or gas connections that require professional installation. Improper installation can be dangerous or create electrical hazards.
How much does oven repair cost?
| Repair | Typical Range |
| Heating element | $150–$300 |
| Thermostat | $150–$300 |
| Gas ignitor | $150–$250 |
| Labour | $50–$150 |
| Full repair | $200–$450 |
My oven is 12 years old and just needs a heating element. Repair or replace?
Get a quote first. If the element costs under $200 and the oven is otherwise working well, repair makes sense. If the quote is $300+ or the oven has had multiple repairs, replacement might be smarter. Ask the technician for their honest recommendation based on the oven’s age and condition – we’ll always give you a straight answer.
Why is my electric oven taking longer to preheat than it used to?
Likely a degraded heating element, thermostat failure, or interior buildup. Clean the oven first. If preheat time doesn’t improve, the heating element is probably degrading. A technician can diagnose definitively and recommend repair or replacement.
Book a Repair
Whether your oven won’t heat, is cooking unevenly, or is producing unusual smells, our technicians can diagnose the fault quickly and advise whether repair or replacement makes more sense for your situation.
National Appliance Repairs services ovens across Australia. All major brands, genuine parts, upfront pricing, 12-month warranty on all repairs.
Call 1300 434 380 or book online.
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