Safety first: If you smell gas at any point during these checks — even faintly — stop. Turn off the gas shutoff valve behind the stove, open windows, leave the house, and call from outside on (720) 447-8577 or Xcel Energy's emergency line at 1-800-895-2999. Do not flip light switches, do not use the phone inside the house, and do not light matches. Gas leaks are not DIY problems.
Quick answer: A gas oven that will not ignite has one of five problems, in this order of likelihood: a closed gas supply valve, a weak igniter that no longer glows hot enough, a failed spark module (older sealed-burner ranges), a stuck-closed safety valve, or a control-board fault. Only steps 1 and 5 are safe DIY. Steps 2–4 involve gas components and a licensed technician should perform the repair.
Gas ovens use a clever safety design: the igniter and the gas safety valve are wired in series. Gas only flows when the igniter draws enough current (typically 3.2–3.6 amps on a Norton-style hot-surface igniter) to open the safety valve. When the igniter weakens with age, it still glows but cannot pull enough current — so the safety valve never opens. This is by far the most common gas-oven failure, and also why the symptom is "glows but no flame" instead of "no glow at all."
Step 1: Check Gas Supply
What to check: Three things in order. First, can you light the cooktop burners? If yes, gas is reaching the appliance — skip ahead. If no, second, find the appliance shutoff valve. It is usually a yellow-handled valve on the flexible gas line behind the range, accessed by pulling the unit out from the wall. The handle should be parallel to the pipe (open). Third, check the rest of the house — is the water heater working? Furnace? If nothing gas-powered is working, the issue is at the meter or upstream, and you need to call Xcel Energy, not an appliance tech.
What it indicates: A closed appliance valve (common after a recent move or remodel) or a service interruption.
DIY fix: Open the appliance valve if closed. Run a long match across each cooktop burner with the dial on "Light" to purge air from the lines — it may take 20–30 seconds the first time. Call a tech (or Xcel) if: the cooktop won't light either — that points to a supply issue, not an oven issue.
Step 2: Check the Igniter Glow
What to check: Turn off all the room lights so you can see the igniter clearly. Open the oven door, remove the bottom oven racks and the floor panel (one or two screws), and locate the igniter — a small cylindrical or rectangular element near the back of the burner. Turn the oven to Bake at 350°F. The igniter should glow bright orange-white within about 30–60 seconds, and the gas should ignite shortly after. If the glow is dim orange or yellow-orange and the gas never lights, the igniter has weakened.
What it indicates: An aged hot-surface igniter (Norton-style or carborundum) that no longer pulls enough current to open the safety valve. Igniters are wear parts and typically fail at 5–10 years of regular use.
DIY fix: Not recommended. While the part itself is $35–$80 and the swap looks easy, igniters are ceramic and brittle, the wire nuts are inside the burner box, and you are working with a live gas connection. Call a tech. Repair runs $200–$340 including the part. Most common gas oven repair.
Step 3: Check the Spark Module (Older Models)
What to check: Some older sealed-burner ranges (pre-2010 mostly) and many modern cooktop-only units use spark ignition instead of a glow bar. With the oven dial turned to "Light" or "Bake," listen for rapid clicking. No click means a failed spark module, a wet ignition harness (spilled liquid, recent cleaning), or a broken ground at the burner head.
What it indicates: Failed spark module, contaminated ignition wire, or carbon buildup on the spark electrode.
DIY fix: If the cooktop burners click but won't light, sometimes a thorough cleaning of the burner caps and a complete dry-out for 24 hours after a recent spill solves it. Call a tech if: drying didn't help — module replacement requires removing the cooktop. Cost runs $180–$280.
Step 4: Check the Safety Valve
What to check: If the igniter glows bright orange-white in step 2 but no gas flows and no flame appears, the safety valve has failed closed. This is rare compared to a weak igniter but it does happen — usually on units with hard-water mineral buildup (a problem in some Denver homes with high-iron well water on the outskirts).
What it indicates: A failed gas safety valve. Critical safety note: Never attempt to bypass, disassemble, or test the safety valve yourself. This component exists specifically to prevent unburned gas from filling your oven and your kitchen.
DIY fix: None. Call a tech. Replacement runs $260–$420. The new valve is always pressure-tested before reconnecting and verify zero leaks with a combustible-gas detector before leaving.
Step 5: Check the Control Board
What to check: Modern smart ovens with touchscreens or digital control panels send an electronic signal to the gas relay. If the board fails or its firmware glitches, the oven may display a temperature and run the convection fan but never energize the igniter circuit. Common signs: no glow at all from the igniter even after 60 seconds, error codes (F1, F2, F3, F30 series), or the oven shutting down mid-preheat.
What it indicates: Failed control board or corrupted firmware.
DIY fix: Try a hard reset first — flip the breaker labeled "Range" or "Oven" off for 10 minutes, then back on. This clears most error states without losing your saved settings. Call a tech if: the reset doesn't work. Board replacement runs $250–$550 depending on the brand. On premium brands like Wolf, Thermador, and Viking, expect the higher end and a longer parts lead time.
Symptom Quick-Reference Table
| Symptom | Likely Cause | DIY Fix? | Repair Cost |
|---|---|---|---|
| Cooktop won't light either | Gas supply closed | Yes (open valve) | $0 |
| Igniter glows dim orange, no flame | Weak igniter | No | $200–$340 |
| No clicking on older range | Spark module | No | $180–$280 |
| Bright glow but no flame | Safety valve | No | $260–$420 |
| No glow at all, error code | Control board | Reset only | $250–$550 |
When to Call (720) 447-8577
Smell gas? Shut off the appliance valve, leave the house, and call from outside. Igniter glows but no flame? That is the most common repair and it can usually be completed in a single visit. Service covers every major gas range brand in the Denver metro — Wolf, Thermador, Viking, Bosch, Samsung, LG, GE, Whirlpool, KitchenAid — with a $75 service fee waived on repair approval and a 1-year parts-and-labor warranty.
Five-star rated on Google with 121 reviews. Serving Highlands Ranch, Denver, Littleton, Centennial, Aurora, Parker, Castle Rock, Lone Tree, and Greenwood Village. EPA 608 Universal Certified and trained on gas appliance safety. Hot-surface igniters for most major brands are stocked on the truck — most "oven won't light" calls become same-day repairs.