Gas Oven Won't Light: Igniter Glows but No Flame
You turn the oven to 400, hear the click, see the igniter at the back of the oven floor start to glow orange, and then nothing happens. Sometimes the burner lights after a long delay with a soft whoomp; sometimes it never lights and the oven eventually gives up. This is the single most common gas oven complaint we see across DC, Northern Virginia and Maryland, and it has one dominant cause that is worth understanding before anyone starts replacing parts.
How a gas oven actually lights
Most gas ovens built in the last 30 years use a hot-surface igniter and a bimetal safety valve wired in series. When you call for heat, current flows through the igniter, which heats up and glows. That same current flows through a bimetal element in the gas safety valve. Only when the igniter draws enough current - typically 3.2 to 3.6 amps - does the bimetal warp enough to open the valve and let gas flow onto the already-hot igniter, where it lights. The design is deliberately fail-safe: if the igniter is not hot enough to light gas, the valve does not open.
Why a glowing igniter can still be the problem
Igniters wear out slowly. An aging igniter still glows, often convincingly orange, but it no longer draws enough current to pull the safety valve fully open. The result is exactly the symptom you see: glow, no flame, or glow for two or three minutes and then a delayed, soft ignition as the valve finally creeps open. Over the following weeks the delay gets longer until the oven stops lighting at all. A technician confirms this with a clamp meter on the igniter circuit; an igniter drawing 2.5 amps looks fine to the eye and is finished.
The safety valve
Safety valves fail far less often than igniters, but they do fail, and the symptom is identical. If the igniter tests strong and gas still does not flow, the valve's bimetal or its internal seal is the fault. Because the valve controls gas, this is not a homeowner part. A technician checks the valve's resistance and whether gas pressure is present at the manifold before condemning it.
Spark-ignition ovens and other designs
Some ovens, particularly higher-end ranges from Wolf, Thermador, Viking and Bertazzoni, use a spark igniter and a flame sensor instead of a glow bar. The oven clicks repeatedly but never lights, or lights and goes out after a few seconds. On those systems the suspects are the spark module, a fouled or misaligned electrode, the flame-sensing rod, or the oven's own gas valve. The same rule applies: if you smell gas without ignition, turn the oven off and ventilate before doing anything else.
What is safe to check yourself
Confirm the range is getting gas by lighting a surface burner. Make sure the oven floor and the igniter area are clean - a heavy grease spill over the burner tube can block the ports nearest the igniter so gas never reaches the glow. Confirm the clock is set, since many ovens will not start a bake with a flashing clock after a power outage. That is the end of the safe list. Do not try to light the oven with a match when the igniter is glowing - the safety valve may open suddenly - and do not bypass the igniter or jump the valve.
The repair
An igniter is one of the most routine gas-range parts; we stock the common flat and round styles for GE, Whirlpool, Frigidaire, Samsung, LG and Kenmore, so most oven-will-not-light calls are fixed in one visit. The job involves removing the oven floor and the burner shield and working next to the gas line, which is why it belongs to a technician. If your range also has a surface burner that clicks or will not light, mention it when you book oven repair - our guide to a stove burner that won't light explains that separate system - and both can be handled in the same appointment.
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