A gas cooktop burner has three jobs: deliver gas, mix it with the right amount of air, and put a spark exactly where that mixture comes out. When one of those slips, you get a familiar set of complaints. The burner ticks and never catches. The ticking will not stop after the flame is up. Or the flame burns lazy and yellow instead of blue. Most of these come from food residue, moisture or a worn electrical part, not from the gas supply itself. Gas still gets the first word in this guide, so begin with the safety rule.
The gas smell rule comes first
Natural gas and propane are both odorized so a leak smells like rotten eggs. If you notice that smell and it lingers with every burner off, stop troubleshooting. Do not light anything, flip a light switch, unplug the range or make a call from inside. Get everyone out of the house, then call your gas utility or 911 from a safe distance outdoors. Homes on propane, which is more common on rural lots around Plant City, Dover or Dade City, should call their propane supplier or 911. Go back inside only when you are told it is safe.
A short puff of odor in the instant before a burner catches is normal. A smell that hangs in the room afterward is not.
What happens when you turn the knob
Turning a burner knob opens a gas valve and, at the same time, closes a small spark switch mounted on that valve's stem. The switch tells the spark module, which is powered through the range's ordinary 120-volt cord, to start firing. The module sends rapid high-voltage pulses to a ceramic electrode beside each burner. Gas flows up through the burner head, out the small ports around its edge, and the cap on top spreads it into an even ring where the spark can reach it. Some ranges add reignition, which sparks again if a burner blows out.
Symptom: every burner clicks, but one will not light
The module and wiring are doing their part, so the trouble is local to that one burner. Turn the knob off, let the cooktop cool, and work through these:
- Reseat the cap. Lift it off and set it back down. A sealed-burner cap has to sit flat and centered on the head. Even a slight tilt sends gas away from the electrode.
- Open the ports. Boil-overs from pasta water, rice or sauce fill the slots around the burner head. A stiff nylon brush or a straightened paper clip clears them. Avoid wooden toothpicks, which snap off inside the port.
- Inspect the electrode. The white ceramic igniter should be clean and intact. Burned-on food on the tip, or a hairline crack in the porcelain, lets the spark escape to metal in the wrong spot. Wipe it with a dry cloth. A cracked electrode needs to be replaced.
- Dry everything. Burner heads and caps that were washed in the sink must be completely dry before they go back on.
If the cap and ports are clean and the burner only lights with a match, the spark at that electrode may be weak, or gas flow through that valve may be restricted. Both of those are service work.
Symptom: no burner clicks at all
Think electricity before gas. Check whether the clock, oven light or display works. If they are dark, look at the breaker and at any GFCI outlet that might share the circuit, since a tripped GFCI elsewhere in the kitchen can cut power to the range's receptacle. If the range has power and still no burner sparks, the spark module or a shorted switch is the usual cause.
Symptom: clicking that will not stop
This is often water. A boil-over or a heavy wipe-down sends liquid under the knobs, where it bridges the contacts of a spark switch and convinces the module that a knob is turned. Humidity adds to it. A kitchen that sat warm and damp with the AC off, for example during a long power outage after a storm, may start clicking on its own when the power comes back.
- Turn every knob off, then unplug the range or switch off its breaker.
- Pull the knobs straight off and dry the area around each stem.
- Leave the burner caps off and let the cooktop air out, ideally overnight. A fan blowing across it helps.
- Restore power. If the clicking has stopped, put the parts back and carry on.
If the cooktop is fully dry and still clicks, one spark switch has probably failed closed, or the module has failed. A technician isolates the switches one at a time to find which. On reignition ranges, steady clicking with the burner lit can also mean a dirty or failing electrode that no longer senses the flame.
Symptom: a yellow, floppy or noisy flame
A healthy flame is mostly blue with a crisp inner cone. Brief orange streaks can come from dust or airborne particles burning off and are not a concern on their own. A flame that is mostly yellow, leaves soot on pans, or lifts off the burner with a roar is a different matter. Common reasons:
- Clogged ports or a cap out of place, which the cleaning steps above correct.
- A blocked air path near the burner orifice from debris or insects, which needs a technician.
- A range set up for the wrong fuel. A range moved from a natural gas house to a propane house, or the reverse, without the manufacturer's conversion kit will burn badly. Conversion changes the orifices and the regulator setting and is gas work for a qualified professional.
A sooting flame produces more carbon monoxide. Keep a working CO alarm in the home and do not run a yellow-flame burner for long cooking sessions until it is sorted out.
Symptom: the burner lights, then goes out
Check for a cap that is out of place and for drafts. A ceiling fan on high or a sliding lanai door left open can push a low flame off a burner. If a burner goes out while gas keeps flowing, turn the knob off, open a window and wait until any odor clears before relighting.
Where owner work ends
Reseating caps, cleaning ports and wiping electrodes are reasonable owner tasks. Leave these to a technician:
- Replacing burner valves, spark switches or the spark module
- Anything involving the gas shutoff, flexible connector or pressure regulator
- Adjusting air shutters or changing orifices
- Sliding the range out far enough to strain the gas connector
Any repair that opens a gas connection should end with the joints leak tested before the range goes back into service.
Repair or replace?
For ignition faults, repair wins almost every time. Spark switches, electrodes and modules are modest parts compared with a new range, and they are widely stocked for common makes such as GE ranges, Whirlpool and Frigidaire. Replacement only becomes a serious question when ignition trouble shows up alongside bigger problems, such as rusted burner bases, a failing oven safety valve or a control board that is no longer made. Our oven repair or replace guide covers the oven side of a gas range, and the range repair page explains how a visit works: the technician tests spark and gas flow at each burner, tells you which part failed, and gives you the price before any repair begins.