Quick Answer
Oven temperature problems are usually diagnosable in under twenty minutes using an independent oven thermometer — common causes include thermostat calibration drift, a faulty temperature sensor, a worn door seal, or a partially failed heating element.
The same diagnostic approach works for both gas and electric ovens, though the underlying fault differs between the two.
If your oven takes too long to heat or cooks unevenly, the cause is almost always one of a small number of components — and testing which one is affected takes very little time.
How to Test Your Oven's Temperature
Place an independent oven thermometer on the middle shelf, set the oven to a standard temperature like 180°C, and check the reading after 20 minutes. A difference of more than roughly 15°C from the display indicates a fault.
Common Causes — Electric Ovens
- Thermostat calibration drift
- Faulty temperature sensor
- Partially failed heating element
- Worn door seal letting heat escape
Common Causes — Gas Ovens
- Faulty thermostat or gas valve
- Burner blockages causing uneven flame distribution
- Worn door seal
When to Call a Pro
Thermostat recalibration, sensor replacement, and heating element repairs all involve electrical components and should be carried out by a licensed technician. Checking and cleaning the door seal is the one step safe to do yourself first.
Frequently Asked Questions
How do I know if my oven's temperature is actually wrong?▼
Test it with an independent oven thermometer — a difference of more than about 15°C from the set temperature indicates a fault.
Can a worn door seal really cause temperature problems?▼
Yes — a seal that doesn't grip fully lets heat escape continuously, which can cause both slow heating and uneven cooking.
Is oven thermostat recalibration something I can do myself?▼
No — it requires accessing internal electrical components and should be done by a licensed technician.
Do gas and electric ovens have different temperature fault causes?▼
There's overlap (door seals, thermostats), but gas ovens can also have burner-specific faults that electric ovens don't.
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Dishank Patel
Lead Technician & Founder · DP Electric Melbourne
Dishank Patel has over 10 years of hands-on experience repairing household appliances across Melbourne's eastern suburbs. He holds all required Victorian electrical and gas licensing and has personally repaired thousands of appliances across brands including Bosch, Miele, LG, Samsung, and Fisher & Paykel.