I preheated my gas oven for twenty minutes before realising it was stone cold inside. The igniter was glowing, the gas supply was on, and nothing was lighting. That single fault led me down a diagnostic path that taught me more about gas oven repair than anything else could have. Fixing a gas oven is one of those jobs that looks intimidating because it involves gas — but in reality, the most common faults have nothing to do with the gas line itself. They involve the igniter, the safety valve, the temperature sensor, or the oven thermostat — all electrical components that are accessible, testable, and replaceable without touching the gas supply at all. This guide covers every common problem that causes a gas oven not heating, not lighting, or not performing correctly, in the order you should work through them.
Gas Oven Not Lighting: Start With the Igniter
The bake igniter is the first component to check on any gas oven not lighting. On modern gas ovens, the igniter does two jobs simultaneously: it glows hot enough to ignite the gas, and it draws enough current to open the gas valve safety valve that allows gas to flow to the burner. This dual function is the reason a weak igniter — one that glows but not brightly enough — prevents the oven from lighting even when it appears to be working. The igniter needs to reach a specific current draw to trigger the safety valve. A degraded igniter glow that looks orange rather than bright white is drawing insufficient current and needs replacement even if it hasn’t failed completely.
The first time I dealt with this, I watched the igniter glow for ninety seconds without the burner lighting and assumed the gas valve was the fault. It wasn’t — the igniter was pulling just under the threshold needed to open the safety valve. Replacing the bake igniter resolved it immediately. Testing igniter resistance with a multimeter confirms the diagnosis: a healthy igniter reads between 40 and 400 ohms depending on the model. A reading outside that range, or an open circuit, means replacement is needed.
Accessing the bake igniter requires removing the oven bottom panel — typically two screws at the front and a lift-and-slide removal. The igniter sits at the rear of the oven burner tube, connected by an igniter wire harness. Disconnect the harness, remove the mounting screws, and the igniter lifts free. Replacement igniters are model-specific — order by oven model number for the correct specification. The part costs between fifteen and forty dollars on most common platforms including GE oven repair applications.
Most people miss this completely: the broil igniter is a separate component from the bake igniter on most gas ovens. If the oven bakes normally but the broil burner won’t light, the broil igniter needs testing independently. The same diagnostic process applies — check glow brightness, test resistance, replace if outside specification.
Gas Oven Not Heating to the Right Temperature
A gas oven that lights but doesn’t reach or maintain the correct oven temperature points to a different category of fault. The temperature sensor — a thin metal probe mounted inside the oven cavity, usually at the upper rear — reads the internal temperature and feeds that data to the oven control board. A faulty temperature sensor sends incorrect readings, causing the control board to shut off gas flow before the oven reaches the set temperature or to cycle the burner incorrectly throughout the cook cycle.
I’ve tested this myself by placing an independent oven thermometer inside the cavity and comparing it to the displayed temperature over a thirty-minute preheat. A discrepancy of more than twenty-five degrees consistently points to a sensor or calibration fault. The temperature sensor tests for resistance with a multimeter — at room temperature, most sensors read between 1000 and 1100 ohms. A reading significantly outside that range means the sensor needs replacement. It’s a ten-dollar part on most machines and takes five minutes to swap.
Oven calibration is the other cause of temperature inaccuracy that doesn’t involve a failed part at all. Most gas ovens allow the temperature offset to be adjusted through the control panel — typically by holding a specific button combination and adjusting the displayed offset value. Check the oven manual for the calibration procedure before ordering any parts. A calibration adjustment costs nothing and resolves temperature drift that develops gradually over years of use.
The oven thermostat on older gas ovens without electronic control boards performs the same function mechanically. A faulty oven thermostat on these machines causes the same symptoms — incorrect temperature, uneven heating, gas oven not baking evenly — and is similarly straightforward to replace once identified.
Fix GE Oven: Brand-Specific Faults Worth Knowing
GE gas ovens follow the same diagnostic logic as every other brand, but a few fault patterns come up repeatedly on GE platforms specifically. The continuous glow igniter design used across GE’s most common gas oven range is more sensitive to voltage fluctuations than spark ignition systems — a home with inconsistent mains voltage will wear through GE igniters faster than average. If you’re on a second or third igniter replacement within a few years, a voltage fluctuation issue is worth investigating before fitting another part.
What surprised me on GE oven repair calls is how often the oven wiring harness connector at the igniter is the actual fault rather than the igniter itself. GE’s igniter connectors sit close to the burner and are exposed to heat cycling over years of use. The connector pins corrode or the plastic housing cracks, creating an intermittent connection that looks exactly like igniter failure. Inspect the connector visually before testing the igniter — a connector replacement costs under five dollars and takes two minutes.
The GE gas range fix for a clicking ignition that won’t light the surface burners is almost always food debris or moisture in the spark electrode housing. Remove the burner cap and burner base, clear any debris from around the spark electrode with a dry toothbrush, and allow the area to dry fully before testing. Surface burner spark ignition issues on a gas range are almost never component failures — they’re maintenance issues that resolve without parts.
Gas Oven Safety Valve and Gas Supply Checks
If the igniter tests healthy, the igniter wire shows continuity, and the oven still won’t light, the safety valve is the next component in the diagnostic chain. The gas valve safety valve opens in response to the current drawn by the igniter — when the igniter reaches operating temperature and current draw, the valve opens and allows gas to flow to the oven burner. A valve that fails to open despite a healthy igniter means no gas reaches the burner regardless of igniter condition.
From experience, the smarter move before condemning the safety valve is confirming the gas supply is fully open and consistent. Check that the gas line shut-off valve behind the range is fully open — parallel to the pipe. Check that other gas appliances in the home are working normally, which confirms the gas supply to the property is active. A gas regulator problem affecting the whole home produces oven symptoms that look identical to a faulty safety valve but requires a completely different resolution.
Safety valve replacement is the most involved repair in gas oven diagnostics and the one where professional involvement makes the most sense for anyone without appliance repair experience. The valve connects directly to the gas line inside the range. While the connection itself is a standard fitting, working on gas supply components without confidence in the procedure creates risk that justifies a technician call. Every other repair in this guide — igniter, temperature sensor, thermostat, control board — is fully within DIY range. The gas valve is the exception.
Oven Door Seal and Heat Retention Problems
A gas oven that lights, reaches temperature on the thermometer, but takes far longer than expected to cook food, or loses heat rapidly when the door is opened briefly, has a door seal problem rather than a heating fault. The oven door seal — a rubber or fibreglass gasket running around the full perimeter of the oven door — degrades over years of heat cycling. Cracks, compression, or sections that have pulled away from the door frame allow heat to escape continuously during cooking, extending cook times and increasing gas consumption without any fault code or obvious symptom beyond poor cooking performance.
I’ve seen this go wrong when cooks compensate for a degraded door seal by increasing oven temperature, which accelerates igniter wear and creates baking results that are burnt on the outside and undercooked inside. Inspect the oven door seal by running your hand around the door perimeter while the oven is at temperature — any point where heat is escaping is a point where the seal has failed. Replacement door seals are inexpensive — typically under twenty dollars — and clip or slide into the door channel without tools on most machines.
What Most People Don’t Know
Gas oven repair guides almost universally focus on the components inside the oven cavity. What they skip is the broiler drawer underneath — the space below the main oven on freestanding gas ranges that houses the broil burner on many models. This drawer accumulates grease, food debris, and moisture over years of use, and that accumulation directly affects the broil igniter and broil burner performance. More critically, a heavily soiled broiler drawer is a fire risk that’s completely separate from any component fault. Grease pooled beneath the burner can ignite during a broil cycle and produce a fire inside the range body rather than inside the oven cavity — an outcome that’s genuinely dangerous and entirely preventable. Removing and cleaning the broiler drawer every three to six months is the single most overlooked maintenance task on gas ranges, and it protects both the appliance and the home in a way that no component repair can substitute for.
Conclusion
Fixing a gas oven comes down to working through the fault systematically — igniter first, then temperature sensor, then safety valve, with door seal and calibration checked alongside. The majority of gas oven not heating and gas oven not lighting problems resolve at the igniter stage for under forty dollars in parts and under an hour of work. The next step is pulling the oven bottom panel and getting a visual on that igniter glow — what colour it is and how long it takes tells you immediately whether you’ve found the fault.
Frequently Asked Questions
Why is my gas oven not heating up?
The most common cause is a weak or failed bake igniter. On modern gas ovens the igniter must draw enough current to open the safety valve — a degraded igniter that glows but doesn’t reach operating current prevents gas from flowing to the burner. Test the igniter resistance with a multimeter and replace it if the reading is outside the specified range for your model.
Why does my gas oven click but not light?
Clicking without lighting on the surface burners is almost always food debris or moisture around the spark electrode. Remove the burner cap, clear debris with a dry toothbrush, and allow the area to dry. For the oven bake burner, clicking without lighting points to an igniter or safety valve fault rather than a spark ignition issue.
How do I know if my gas oven igniter is bad?
Two signs: the igniter glows orange rather than bright white during a heat cycle, or it glows for more than 90 seconds without the burner lighting. Confirm with a multimeter resistance test — a reading outside 40 to 400 ohms indicates the igniter needs replacement.
Is it safe to repair a gas oven yourself?
Most gas oven repairs — igniter replacement, temperature sensor, thermostat, door seal — don’t involve the gas supply and are safe to do yourself. Safety valve replacement and any work on the gas line connections are the exceptions where professional involvement is the right call.
How much does gas oven repair cost?
A replacement bake igniter costs between fifteen and forty dollars. A temperature sensor runs between ten and thirty dollars. A safety valve replacement done professionally typically costs one hundred to two hundred dollars including labour. Most common faults resolve for under fifty dollars in parts on a DIY basis.
Why is my GE gas oven not heating?
GE gas ovens most commonly fail at the continuous glow igniter. Before replacing the igniter, check the igniter wire connector near the burner — GE connectors are prone to heat damage and corrosion that creates intermittent faults mimicking igniter failure. A connector inspection takes two minutes and may save the cost of a new part.
How do I fix uneven baking in a gas oven?
Uneven baking is usually caused by a faulty temperature sensor sending inconsistent readings to the control board, a degraded door seal losing heat from one side of the oven, or a calibration offset that’s drifted over time. Test with an independent oven thermometer, inspect the door seal, and check the calibration setting before replacing any components.
