Gas Oven Not Heating Up – Causes & Fixes
1. Weak or failed igniter (most common cause)
The igniter is the single most common reason a gas oven stops heating. Over time the igniter element weakens, draws insufficient current to open the gas valve, and the burner never lights.
- Unplug the oven or switch off its dedicated circuit breaker.
- Remove the oven bottom panel (usually two screws) to expose the bake burner.
- Watch the igniter when you turn the oven on: a healthy igniter glows bright orange within 90 seconds. A dull glow that never lights the burner confirms weakness.
- Disconnect the igniter wire harness and test resistance with a multimeter. Most igniters read 40–400 Ω when good; an open circuit (OL) means it has failed.
- Replace the igniter if it fails either test.
A direct replacement bake igniter restores proper glow and gas-valve current.
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2. Faulty oven temperature sensor (thermostat probe)
The temperature sensor tells the control board the oven’s actual temperature. If it fails or drifts, the board may think the oven is already hot and never calls for heat.
- Locate the sensor probe inside the oven—usually mounted at the upper-rear wall with two screws.
- Pull the oven out slightly and disconnect the sensor’s two-wire connector at the back.
- Test resistance with a multimeter at room temperature (~70 °F / 21 °C). Most sensors read approximately 1,000–1,100 Ω. Consult your owner’s manual for the exact specification.
- Replace the sensor if the reading is significantly out of range or shows an open circuit.
- Re-run an oven calibration cycle after installing the new sensor.
A new temperature sensor ensures accurate temperature readings and proper heat cycling.
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3. Gas oven not heating up due to a tripped or faulty safety valve (gas valve)
The safety valve (also called the oven valve or gas safety valve) opens only when the igniter passes enough current through it. A defective valve stays closed even when the igniter glows correctly.
- Confirm the igniter glows bright and hot for more than 90 seconds without the burner lighting—this pattern points to the valve rather than the igniter.
- Check that the main household gas supply valve is fully open and that other gas appliances in your home work normally.
- If gas supply is confirmed but the burner still won’t open, the safety valve itself is likely defective.
- Gas valve replacement involves disconnecting a gas line and should be performed by a qualified technician unless you are trained in gas appliance repair.
Replacing the safety valve restores gas flow to the bake burner when the igniter signals correctly.
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4. Defective oven control board
The electronic control board manages heat cycles and communicates with the sensor and igniter circuit. A failed relay or burned trace on the board can prevent any heat from being requested.
- Inspect the board for obvious signs of damage: burn marks, scorched relay sockets, or bulging capacitors.
- Confirm the igniter, sensor, and gas valve all test good before condemning the board—the control board is an expensive part and should be the last component replaced.
- Disconnect power, remove the back panel, and locate the board (typically in the upper rear or console area).
- Photograph all wire connections before removal, then swap in the replacement board and reconnect all harnesses.
- Restore power and run a full heat cycle test.
A new control board restores correct communication between all oven components.
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5. Broken broil igniter or broil burner (broil function only)
If only the broil function fails to heat, a separate broil igniter or burner may be at fault rather than any shared component.
- Set the oven to Broil and observe whether the top burner ignites within 90 seconds.
- Access the broil burner by removing the oven racks and the broil element cover at the top of the oven cavity.
- Test the broil igniter with a multimeter the same way as the bake igniter (Step 4 in Cause 1).
- Inspect the broil burner tube for cracks, clogs, or corrosion.
- Replace the broil igniter if it tests open, or clean/replace the burner tube if visibly damaged.
A replacement broil igniter restores proper top-burner ignition for broiling.
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6. Faulty oven door switch or door not sealing
Some gas ovens use a door switch that cuts power to the igniter circuit if the door is detected as open or ajar. A worn door seal also causes heat loss that makes the oven feel like it is not heating at all.
- Close the oven door firmly and check that it latches flush without gaps around the frame.
- Inspect the door gasket (the rubber or braided seal around the door edge) for tears, hardening, or missing sections. Replace if damaged.
- Locate the door switch (usually a small plunger switch inside the door frame). Press and release it manually—you should hear a distinct click.
- Test the switch with a multimeter set to continuity: it should show continuity when pressed and open when released (or vice versa depending on design).
- Replace the door switch if it fails the continuity test.
A new door gasket or door switch ensures the oven seals properly and the igniter circuit stays active.
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Frequently asked questions
How do I know if my oven igniter is bad?
Watch the igniter through the oven window or broiler drawer after turning the oven on. A healthy igniter glows bright white-orange and lights the burner within about 30–90 seconds. If the glow is faint, takes longer than 90 seconds, or the burner never lights at all, the igniter is likely too weak and needs replacement. You can confirm failure with a multimeter—an open circuit reading means the igniter is definitely defective.
Is it safe to use my gas oven if it won’t light?
No. Do not attempt to manually light a modern gas oven that relies on an electronic igniter—these ovens are not designed for match lighting and the gas valve may not open safely without the igniter’s current. Repeated failed ignition attempts can allow raw gas to accumulate in the oven cavity, creating a serious explosion risk. Turn the oven off and leave the area ventilated until the appliance is repaired. For official safety guidance, see the U.S. Consumer Product Safety Commission gas safety resources.
Why does my oven click but not heat up?
Continuous clicking without heat usually means the surface burner igniter system is sparking (common if there is moisture or debris around the burner caps), but this is separate from the oven bake igniter. For the oven cavity itself, a clicking sound is less common—if you hear a click and see an igniter glow but no flame, suspect the gas safety valve. If there is no glow at all, focus on the igniter or control board.
How much does it cost to fix a gas oven that won’t heat?
A replacement bake igniter is typically the least expensive repair—parts generally range from $15 to $50, and the job is DIY-friendly for most homeowners. A temperature sensor runs $20–$60 in parts. A control board or gas safety valve can cost $80–$200 or more in parts alone, and professional labor typically adds $100–$200 depending on your area. Getting a repair quote before purchasing parts is always a good idea for the more expensive components.