Oven not heating properly
An oven that won't heat, heats unevenly, or reaches wrong temperatures is usually a failed element (electric), igniter (gas), or temperature sensor. Most repairs are $30–$60 DIY.
Quick answer
For an electric oven: visually inspect the heating elements (bake and broil). A broken bake element usually shows visible damage — a break in the coil or bright spots where it burned through. Replacement is a 20-minute job. For a gas oven, the igniter has usually failed — replacement is model-specific but generally DIY. If elements/igniter look fine, the temperature sensor or control board may be at fault.
Key facts
| Difficulty | Medium |
|---|---|
| Time | 30–90 min |
| Parts cost | $20–$80 |
| Tools needed | Screwdriver, multimeter, work gloves |
| Parts needed | Heating element ($30–$60), oven sensor ($15–$30), or igniter ($40–$80) |
What's happening
An oven heats using either electrical heating elements (electric oven) or a gas burner ignited by an electronic igniter (gas oven). A temperature sensor tells the control board when to turn heat on and off. Failure of any component causes heating problems.
Bake element failure is the most common electric oven problem — the metal element develops a break and stops heating. Usually visible as a break in the coil or bright/burnt spots.
Igniter failure is the most common gas oven problem — the igniter glows red to light the gas, but weak igniters can't get hot enough to open the safety valve. Result: no ignition.
Common causes (ranked by frequency)
- Broken bake element (electric) 40% of electric cases
Visible break in the heating element at the bottom of the oven. Element replacement is DIY.
- Broken broil element (electric) 15% of electric cases
Same failure at the top element. Usually shows visible damage.
- Failed igniter (gas) 60% of gas cases
Igniter glows but can't get hot enough to open the safety valve. Replacement is model-specific.
- Failed temperature sensor 15% of cases
The sensor giving bad temperature readings to the control board. Oven runs too hot, too cold, or stops heating. Sensor is DIY replacement.
- Bad control board 10% of cases
Main control board failure. Expensive part ($150–$350) plus labor if not DIY.
- Bad thermostat 5% of cases
In older ovens with mechanical thermostats. Modern ovens use electronic sensors instead.
How to diagnose
Step 1 — determine oven type. Electric or gas? Different diagnosis paths.
Step 2 — visually inspect the elements (electric). With oven off and cool, look at bake element (bottom) and broil element (top). Do you see a break, bright spot, or blistering? A failed element usually shows visible damage.
Step 3 — test heating (electric). Turn on bake at 350°F. Watch the bake element — should glow red-orange within 30 seconds to a few minutes. If nothing happens, element is likely failed. Same test for broil element.
Step 4 — for gas, watch the igniter. Turn on the oven. Watch the igniter (behind the burner cover at the bottom of the oven). It should glow red-orange within 60 seconds. If it glows weakly or takes very long, needs replacement.
Step 5 — check temperature accuracy. Use an oven thermometer ($10) to compare actual temperature to setting. If off by 25°F or more, temperature sensor calibration or replacement needed.
The fixes
Replace the bake element MOST COMMON ELECTRIC
Tools
- Screwdriver
- Work gloves
Parts
- Replacement bake element ($30–$60) — model-specific
- Turn off power to the oven at the breaker.
- Verify power is off — try turning on the oven; nothing should happen.
- Open the oven and remove racks.
- Locate the two screws holding the element in place — usually at the back of the oven where the element attaches.
- Remove the screws.
- Pull the element forward carefully — wires attached at the back come with it a couple inches.
- Disconnect the wires from the element terminals — note position for reassembly.
- Attach the wires to the new element terminals (same positions).
- Push the new element into position — carefully so wires don't fall behind the oven wall.
- Reinstall mounting screws.
- Replace oven racks and restore power.
Replace the igniter (gas) MOST COMMON GAS
Tools
- Screwdriver
- Wire cutters (sometimes)
Parts
- Igniter ($40–$80) — model-specific
- Turn off gas supply and unplug oven.
- Remove racks and bottom of oven panel — the burner is beneath.
- Locate the igniter — a small ceramic/metal component next to the gas burner.
- Remove the mounting screws or bracket.
- Disconnect the wires (usually via a plug connector).
- Install the new igniter — connect wires, reinstall mounting.
- Reattach bottom panel, restore gas and power.
Replace the temperature sensor IF TEMPS ARE OFF
Tools
- Screwdriver
Parts
- Temperature sensor ($15–$30) — model-specific
- Turn off power at breaker.
- Locate the temperature sensor — a thin metal probe at the top rear inside the oven.
- Remove the mounting screws.
- Pull the sensor forward and disconnect the wires at the back.
- Install new sensor in the same position and orientation.
- Reconnect wires and mount.
- Restore power.
Prevention
Extend oven life:
- Clean spills promptly — burnt-on food can affect heating and sensors.
- Don't line the bottom with foil — traps heat and can damage elements.
- Use self-clean cycle sparingly — the intense heat stresses components.
- Verify oven temperature annually with an inexpensive oven thermometer — sensors can drift.
When to call a pro
- Control board failure (expensive part, often not worth DIY)
- Gas supply issues — always professional
- You smell gas at any point — leave and call gas utility
- Oven is 15+ years old with multiple issues — replacement often more economical
- You're not comfortable with 240V electrical work
Appliance repair cost: $150–$400 for typical repairs. Control board replacement: $250–$500. New wall oven installed: $1,500–$3,500. New range: $600–$2,000.
Cost estimate
Frequently asked questions
Common issue with older ovens. Causes: bad temperature sensor, weak elements (approaching failure), door seal issue (heat escaping), or convection fan issue (in convection ovens). Test with oven thermometer to diagnose.
Yes for baking. The bake element (bottom) handles baking; broil element (top) is only for broiling. If broil works but bake doesn't, avoid using — heat from top-only cooking damages food and appliance.
Weak or failing heating element (about to fail), incorrect thermostat setting, door not sealing properly, or electrical issue. New elements preheat 350°F in 10–15 minutes.
Under 8 years old with $200 or less repair — usually repair. Over 12 years old or repair over 50% of new cost — usually replace. Between those extremes, weigh energy efficiency of new model plus reliability.