--- title: "A Gas Smell Over the Cooktop: What to Do in the First Minutes" description: "Why no knob, touch key or downdraft switch gets touched, where gas runs in the cabinet below, what to tell the utility and when a burner may be lit again." url: "https://cooktoprepair.center/guides/cooktop-gas-smell-first-steps/" date_modified: "2026-09-26" --- Gas, fire and burn safety # A Gas Smell Over the Cooktop: What to Do in the First Minutes A cooktop gas smell, the rotten-egg or sulfur odor utilities add to natural gas, means leaving the house at once without touching a burner knob, a light switch, the downdraft control or a phone, then calling the gas utility or 911 from a safe distance outdoors. Nobody opens the cabinet below to look for the valve, and nobody lights a burner until the utility has cleared the kitchen. By [CooktopRepair.center technical team](https://cooktoprepair.center/authors/technical-team/) Published September 26, 2026 ## At a glance. On a built-in gas cooktop the burners sit on the counter, but the gas that feeds them arrives through the cabinet underneath, so a smell can rise from the grates, from behind the cabinet doors or from both at once. The next minute is about getting people out of the house, not about working out which of those places it came from. Read the whole guide ### What the odor is A warning blended into the gas Natural gas has no smell of its own; utilities add an odorant people describe as rotten eggs, sulfur or garlic. ### The first move Out of the house, upwind if you can National Fuel tells its customers to leave the area and move upwind where possible. ### Left untouched Knobs, switches, the downdraft, phones Any one of them may throw a small spark, and a spark is all pooled gas needs. ### Who clears the kitchen The gas utility or the fire department Only after their all-clear does anyone light a burner or open the cabinet to work. In this guide 1. Why the burners are the last thing to touch 2. Where the gas runs on a built-in cooktop 3. Phoning it in from the sidewalk 4. When the printed manual gives a different order 5. Turning the burners back on, and who says when 6. Step by step 7. Questions ## Why the burners are the last thing to touch A cooktop sits at waist height in the middle of the counter, often in an island, with its knobs right under your hand. That is what makes a cooktop gas smell so tempting to deal with on the spot: one of those knobs might be a few degrees open. Gas utilities are unanimous that finding or stopping a leak is not a householder's task. The Public Service Commission of Wisconsin says it in one line: leave the area immediately and call the utility or 911 from a safe distance outdoors. Turning a knob is not a neutral act on a modern gas cooktop. GE's manual for its Monogram downdraft gas cooktop explains that every igniter on the top clicks and sparks even when only one burner is being turned on, so reaching for any knob, even to turn it toward off, can fire a row of sparks into the gas you are smelling. The same reasoning covers anything else on the counter or the wall that switches current. - Not a single knob, even the one you suspect is open. - No touch key, light switch or under-cabinet light on the way out. - No downdraft switch, whether the vent is raised or lowered. - No match, lighter, flashlight or cigarette, and no starting a car in an attached garage. - No phone call from inside the house, on a cell phone or a landline. ### A knob turned but no flame under the grate If you can see a knob resting at an on position with nothing burning, remember which one it was and tell the utility. Walking back to turn it puts your hands and face in the richest pocket of gas in the room, directly above the burner that has been releasing it. ### A downdraft vent that is already running On a cooktop with a pop-up or flush downdraft vent, the blower sits in the cabinet below and pulls air across the burners toward the duct. If it was already running when you noticed the smell, leave it running; switching it off at the counter or at the breaker is still a switch. If it was off, do not start it hoping to clear the air. Source: [Public Service Commission of Wisconsin — Natural Gas Consumer Safety](https://psc.wi.gov/Pages/ServiceType/Energy/PipelineSafety/NaturalGasConsumerSafety.aspx) — Leave immediately and call the utility or 911 from a safe distance outdoors; the odorant smells of rotten eggs, sulfur or garlic; a leak can hiss near a gas appliance; the utility maintains the meter and the line to it, the customer everything beyond; [National Fuel — Smell Gas? Leave Fast](https://www.nationalfuel.com/safety/smell-gas-leave-fast-ny-home-biz-pa-home-biz/) — Natural gas is odorless and an odor is added; leave the area and move upwind if possible; do not light a match, start an engine, use a phone or light switches; [GE Appliances — Monogram 36-inch downdraft gas cooktop ZGU660/ZGU661, Use and Care and Installation Guide (49-8715)](https://www.geappliances.com/content/older-pdfs/49-8715.PDF) — All igniters click and spark when one burner is turned on; what to do if you smell gas, including calling the fire department if the supplier cannot be reached; shut-off valve in an easily accessible location near the pipe stub, regulator and flexible connector; installer makes sure the owner knows how and where to shut off the gas; leak check with a liquid leak detector; never use an open flame to locate a leak ## Where the gas runs on a built-in cooktop A freestanding appliance hides its gas connection behind itself; a built-in cooktop hides it underneath, inside the base cabinet. GE's installation pages for the downdraft cooktop trace the path: the house pipe enters the cabinet, a manual shut-off valve goes in an easily reached spot as close to the pipe stub as possible, a flexible metal connector or rigid pipe climbs to a pressure regulator, and the regulator feeds the burner manifold under the top. Every joint along that route is a place gas can escape, and so is every burner valve behind a knob. The same cabinet usually holds things that do not mix well with a leak: aerosol cleaners, a trash bin, the outlet that powers the igniters. On a pro-style rangetop the layout is much the same, except that the supply often comes through the back wall into the base cabinet the rangetop rests on. ### A smell strongest when the cabinet doors open If the smell reached you as you opened the doors under the cooktop, close nothing and move nothing: step back and leave as you would for any other leak. Gas collected inside a closed cabinet can be concentrated enough to ignite, and that cabinet also holds the plug for the igniters. Tell the crew where the smell was strongest; it saves them time. ### A hiss, or no hiss at all The Wisconsin commission notes that a leak can make a hissing sound near a gas appliance. Silence proves nothing, though. A slow seep at a fitting under the counter makes no sound you would pick out over a refrigerator compressor or a running dishwasher. Source: [GE Appliances — Monogram 36-inch downdraft gas cooktop ZGU660/ZGU661, Use and Care and Installation Guide (49-8715)](https://www.geappliances.com/content/older-pdfs/49-8715.PDF) — All igniters click and spark when one burner is turned on; what to do if you smell gas, including calling the fire department if the supplier cannot be reached; shut-off valve in an easily accessible location near the pipe stub, regulator and flexible connector; installer makes sure the owner knows how and where to shut off the gas; leak check with a liquid leak detector; never use an open flame to locate a leak A house's front door standing open, a kitchen island with a gas cooktop visible down the hallway. ## Phoning it in from the sidewalk Once everyone, pets included, is outside, move well away from the house, upwind if the weather allows, and call the gas utility's emergency line or 911. GE's cooktop manual adds a fallback worth remembering: if the gas supplier cannot be reached, call the fire department. No crew minds a trip that ends with a clean reading; confirming a kitchen is clear is part of their work. Details that help the crew, every one of which can be given from the sidewalk: - That the kitchen has a built-in gas cooktop or rangetop, and whether it sits in an island or along a wall. - Whether the smell was strongest over the burners, low down at the cabinet doors, or somewhere else in the room. - Whether a burner was in use, had just gone out, or had been clicking without catching. - Whether the cooktop was recently installed, swapped, lifted out for a countertop job or converted from natural gas to propane. - Whether anyone feels dizzy, nauseous or has a headache. Source: [National Fuel — Smell Gas? Leave Fast](https://www.nationalfuel.com/safety/smell-gas-leave-fast-ny-home-biz-pa-home-biz/) — Natural gas is odorless and an odor is added; leave the area and move upwind if possible; do not light a match, start an engine, use a phone or light switches; [GE Appliances — Monogram 36-inch downdraft gas cooktop ZGU660/ZGU661, Use and Care and Installation Guide (49-8715)](https://www.geappliances.com/content/older-pdfs/49-8715.PDF) — All igniters click and spark when one burner is turned on; what to do if you smell gas, including calling the fire department if the supplier cannot be reached; shut-off valve in an easily accessible location near the pipe stub, regulator and flexible connector; installer makes sure the owner knows how and where to shut off the gas; leak check with a liquid leak detector; never use an open flame to locate a leak ## When the printed manual gives a different order Owners who keep the manual in a kitchen drawer sometimes find advice that reads a little differently. The same GE downdraft cooktop manual prints two lists: its safety pages say not to light any appliance, touch any electrical switch or use any phone in the building, and to call the gas supplier from a neighbor's phone; the installation pages begin their list with opening windows. Manuals of that age were written before cell phones and before utilities settled on today's plain message. Where the two disagree, go with the gas utility's current instructions. National Fuel's version is to leave the area immediately, move upwind if possible and call its emergency line, avoiding sparks and sources of heat on the way. A window is worth opening only if it is directly on your path out and costs no time at all. ### Should the valve under the counter be closed? The GE manual's list of cooking precautions also says to turn off the gas to the cooktop if you smell gas. That valve lives inside the base cabinet, often behind a trash pull-out or a drawer box, so closing it means kneeling with your head in the space where gas collects. For a smell you notice right now, leave the valve as it is and let the utility decide. Knowing where it sits is for planned work such as a repair visit, and GE asks its installers to make sure owners know how and where to shut it off. Source: [National Fuel — Smell Gas? Leave Fast](https://www.nationalfuel.com/safety/smell-gas-leave-fast-ny-home-biz-pa-home-biz/) — Natural gas is odorless and an odor is added; leave the area and move upwind if possible; do not light a match, start an engine, use a phone or light switches; [GE Appliances — Monogram 36-inch downdraft gas cooktop ZGU660/ZGU661, Use and Care and Installation Guide (49-8715)](https://www.geappliances.com/content/older-pdfs/49-8715.PDF) — All igniters click and spark when one burner is turned on; what to do if you smell gas, including calling the fire department if the supplier cannot be reached; shut-off valve in an easily accessible location near the pipe stub, regulator and flexible connector; installer makes sure the owner knows how and where to shut off the gas; leak check with a liquid leak detector; never use an open flame to locate a leak ## Turning the burners back on, and who says when The utility may close the valve at the cooktop, at the meter or both, and may hang a tag on it. Turning the supply back on is its call. The Wisconsin commission reminds customers that the utility maintains the meter and the line leading to it, while everything past that point is the customer's responsibility, so a leak inside a wall goes to a plumber or gas contractor and a leak at the cooktop goes to someone who works on cooktops. Once the kitchen has been declared safe, our technician can look at the cooktop itself: whether each burner lights promptly and burns with a steady blue flame, whether the valves behind the knobs close fully, and whether the joints from the shutoff valve to the regulator pass a check with a liquid leak detector, as GE's instructions specify. That manual is blunt about the alternative: never use an open flame to locate a leak. Source: [Public Service Commission of Wisconsin — Natural Gas Consumer Safety](https://psc.wi.gov/Pages/ServiceType/Energy/PipelineSafety/NaturalGasConsumerSafety.aspx) — Leave immediately and call the utility or 911 from a safe distance outdoors; the odorant smells of rotten eggs, sulfur or garlic; a leak can hiss near a gas appliance; the utility maintains the meter and the line to it, the customer everything beyond; [GE Appliances — Monogram 36-inch downdraft gas cooktop ZGU660/ZGU661, Use and Care and Installation Guide (49-8715)](https://www.geappliances.com/content/older-pdfs/49-8715.PDF) — All igniters click and spark when one burner is turned on; what to do if you smell gas, including calling the fire department if the supplier cannot be reached; shut-off valve in an easily accessible location near the pipe stub, regulator and flexible connector; installer makes sure the owner knows how and where to shut off the gas; leak check with a liquid leak detector; never use an open flame to locate a leak ## Where to stop Hunting for the valve behind the cabinet doors, following the connector with your nose, dabbing fittings with soapy water and prying the cooktop up from the counter are all off limits. From the meter to the burner ports, the piping is for the utility's crew and gas technicians until they declare the kitchen safe; our own visit comes after that. Written by [CooktopRepair.center technical team](https://cooktoprepair.center/authors/technical-team/). The technicians sent out on the cooktop visits booked through this site. What they write comes from lifting tops out of countertop cutouts and working in the cabinet underneath, checked against the manufacturer's installation and use-and-care guides wherever those are published. Sources: [Public Service Commission of Wisconsin — Natural Gas Consumer Safety](https://psc.wi.gov/Pages/ServiceType/Energy/PipelineSafety/NaturalGasConsumerSafety.aspx) · [National Fuel — Smell Gas? Leave Fast](https://www.nationalfuel.com/safety/smell-gas-leave-fast-ny-home-biz-pa-home-biz/) · [GE Appliances — Monogram 36-inch downdraft gas cooktop ZGU660/ZGU661, Use and Care and Installation Guide (49-8715)](https://www.geappliances.com/content/older-pdfs/49-8715.PDF) ## Step by step. Five steps, in the order worth doing them. 01 ### Hands off Leave every knob, touch key, switch and the downdraft control exactly as you found them. 02 ### Everyone out Take people and pets out by the nearest door and move away from the house, upwind if you can. 03 ### Call from outside Phone the gas utility's emergency line or 911 once you are clear, and the fire department if the utility does not answer. 04 ### Stay outside Stay out until the crew says the house is safe; they decide when the gas goes back on. 05 ### Then book the cooktop Only after that should anyone test the burners, valves, regulator and connector. For the heart of your home. ## Questions owners ask. ### A burner gives off a brief puff of odor as it catches. Should that worry me? A moment of odor while a slow burner catches is common and fades as the flame settles. Odor that outlasts the ignition, or appears when every knob is at off, is the kind that sends everyone outside to call. ### We replaced our gas cooktop with induction. Why would the kitchen smell of gas? The induction top itself cannot leak gas, but the old supply pipe is often capped and left in the base cabinet, and a water heater or furnace may share the house piping. Treat the smell exactly as you would with gas burners in use. ### Should I close the valve under the counter on my way out? No. Reaching into the base cabinet keeps you in the gas longest, right where it pools. Leave it and tell the utility where it is. ### Is a gas detector worth having in a kitchen with a gas cooktop? The odorant only works if someone can smell it, and a weak sense of smell or strong cooking odors can hide it. A natural gas detector and a carbon monoxide alarm are separate devices; a kitchen with gas burners is better served by both, each placed as its own instructions say. ## The problems behind it. Each has a page of its own: what it usually means and the causes in the order worth checking. [All 17 problems](https://cooktoprepair.center/problems/) Gas, fire, broken glass or live current ### Cooktop Gas Smell 5 causes, cheapest first Problem ### Cooktop Igniter Keeps Clicking 5 causes, cheapest first Problem ### Cooktop Burner Won't Light 6 causes, cheapest first ## When it needs a technician. The repairs on the right are where this guide ends when the checks do not settle it. ### Diagnostic visit A visit that runs every burner or zone on the cooktop, looks under it from the cabinet below and names the failed part before anything is ordered. ### Spark module and gas valve repair The parts deeper in a gas cooktop: the spark module that fires the electrodes, the switches on the valve stems, the valves that meter the flame and the regulator. ### Burner and igniter repair Gas cooktop and rangetop burners that will not light, light late or burn with a ragged flame, traced to the electrode, the burner head, the cap or the ports. ## More in gas, fire and burn safety. What to do about a gas smell, how to put out a pan fire on the cooktop, and how to shut down a burner or zone that will not turn off. [The whole section](https://cooktoprepair.center/guides/safety-and-food/) When to stop using the cooktop ### Cracked Glass Cooktop: Power Off, Hands Off, Then Replace the Top The breaker or the plug first, why cleaning a crack is a shock risk, telling a crack from a pan mark, how glass gets broken and what replacing it involves. When to stop using the cooktop ### Induction Cooktops, Pacemakers and Other Implants What an induction zone gives off, the distance heart-device makers advise, habits that keep it at the counter, and questions for the device clinic. Guides ### All 18 guides Six sections, by what you are trying to find out. --- **[Read on the site: A Gas Smell Over the Cooktop: What to Do in the First Minutes](https://cooktoprepair.center/guides/cooktop-gas-smell-first-steps/)** **[Book a visit with CooktopRepair.center](https://cooktoprepair.center/schedule/)**