How a gas burner lights, and the three ways it fails
Turn the knob and two things happen. A valve lets gas flow to the burner, and a switch behind the knob tells the spark module to fire. The module sends a high-voltage pulse to a small ceramic electrode beside each burner, and the spark jumps to the burner head, lighting the gas as it escapes through the ring of ports under the cap. That gives three ways to fail. Clicking with no flame points to a cap sitting crooked, clogged ports, or a spark too weak or jumping to the wrong spot. No click at all points to missing power, a failed module or a bad switch. Clicking that won’t stop after the flame catches usually means moisture in a knob switch or on an electrode.
Gas is the main heating fuel in a large share of Olympia, Lacey and Tumwater homes, so gas cooktops are common wherever PSE runs a main, and propane feeds them out on the unincorporated edges. A range moved from one fuel to the other needs its burner orifices converted, and a skipped conversion shows up as tall yellow flames or weak ones. The damp adds a wrinkle. A boil-over or a heavy spray-down sends water into an electrode or down a knob stem, and with indoor humidity hovering near 80 percent it can take a while to dry on its own. We work on these cooktops in Westside ramblers around West Bay Hills and Lakemoor, early Lacey homes in Brentwood and Belair, and Tumwater’s Deschutes neighborhood.
Burner trouble: what the click tells you
| What the burner does | Likely reason | Okay to check yourself? | Our side of it |
|---|---|---|---|
| Clicks but no flame on one burner | Cap off-center or ports clogged with boil-over | Yes, with knobs off and the cooktop cool | Clean ports, seat the cap, and test spark and flame |
| No clicking on any burner | No power, a tripped GFCI, or a failed spark module | Yes, check the outlet, breaker and GFCI only | Test the module’s output and the switch circuit |
| Clicking won’t stop after lighting or cleaning | Moisture in a knob switch or on an electrode | Yes, leave it off and let it dry | Dry and test, then replace a shorted switch or electrode |
| Weak, uneven or tall yellow flame | Partly blocked ports, wrong cap, or orifices wrong for the fuel | Clean and reseat only; no orifice work | Check orifices against the fuel and set the flame correctly |
| Faint orange spark, burner slow to catch | Cracked electrode or worn ignition wire | No, stop using that burner and book | Replace the electrode or wire and confirm a strong spark |
Safe steps before you book
- Turn every knob off and let the cooktop cool fully before touching grates or burners.
- Lift off the grate and cap, wash the cap, and dry both completely before replacing them.
- Clear clogged ports gently with a straightened paper clip; a toothpick can snap off inside.
- Set each cap flat and centered, since a tilted cap often clicks without catching.
- After a boil-over or heavy cleaning, leave the cooktop off and let it dry overnight.
- Smell gas? Don’t flip any switch; leave the house and call PSE from outside.
When the cooktop needs a technician
If the caps are clean, dry and seated and a burner still won’t light, or if nothing clicks at all with the power on, the fault is in the spark module, a switch, an electrode or the wiring between them. Anything that touches the gas valve, the orifices or a propane conversion is ours to handle, never a do-it-yourself project. We test the module’s output, check each switch and electrode, confirm flame quality, and name the failed part. One written price comes first. A yes rolls the $99 diagnostic into that figure; a no ends the visit at $99.
Asked about this problem
Why does my burner click but not light?
Most often the cap is sitting off-center or the ports around the burner head are clogged with dried food, so gas doesn’t reach the spark. A boil-over that leaves the electrode wet causes the same symptom. Let everything cool, wash and dry the cap, clear the ports gently, and reseat it flat. If it still clicks without catching, the electrode, wire or module needs testing.
Why does my stove keep clicking after I turn it off?
Water or cleaner has usually worked its way into a knob switch, which keeps telling the spark module to fire. Pull the knobs straight off, stop spraying cleaner toward the control panel, and give it a day to dry. If the clicking continues once everything is dry, the switch has likely shorted and needs replacing.
Will my gas cooktop spark during a power outage?
No. The spark module runs on household power, so during a PSE outage the burners won’t click. Wait for power to return rather than improvising with the gas on. When the lights come back, if the click doesn’t, a tripped GFCI outlet or a surge-damaged spark module is the usual reason, and both are quick to test.
Do you work on propane cooktops around Tumwater and Lacey?
Yes. We service gas and propane ranges and cooktops across Tumwater, Lacey and Olympia, including homes on the unincorporated edges that run on a tank. Propane burners use smaller orifices than natural gas, so a range that moved between fuels needs a proper conversion. When the flames look wrong, the orifices are near the top of our list.
Is a yellow flame on a gas burner dangerous?
A blue flame with occasional orange flecks from dust is normal. A lazy, tall, mostly yellow flame that leaves soot on pans means the burner isn’t mixing air properly or the orifice is wrong for the fuel. That wastes gas and can raise carbon monoxide in the kitchen. Stop using that burner and book a visit.
