Most Likely Causes (Ranked)
The most common cause — a control knob was bumped or not fully turned off. This allows gas to flow without igniting. Common with children in the house or after stove cleaning.
Older stoves have a standing pilot light. If it goes out from a draft or dirty pilot, unburned gas seeps into the kitchen. Modern stoves use electronic ignition.
The flexible gas connector between the wall valve and stove can leak at connections, especially if the stove was moved. Connectors crack with age.
A leak in the gas line running through walls or floor. Caused by corrosion, settling, or construction damage. Less common but more serious.
A failing oven igniter lets gas fill the oven cavity before igniting (or not at all). Delayed ignition causes a 'whoosh' when it catches.
How to Fix It
Check All Burner Knobs
$0Most common fix — takes 5 seconds.
- 1Check every burner and oven knob — ensure all are fully OFF.
- 2Turn each fully off with a deliberate click.
- 3If one was partially on, ventilate for 5-10 minutes.
- 4Consider child-proof knob covers ($5-10) if this recurs.
Relight or Service the Pilot Light
$0-150For older stoves with standing pilots.
- 1Turn off all burners and oven. Ventilate 5 minutes.
- 2Locate pilot — usually under stovetop (lift top) or oven floor. Check owner's manual.
- 3Hold long match to pilot while pressing gas knob. Hold 30-60 seconds after lighting.
- 4If pilot won't stay lit, thermocouple needs replacement ($10-20 part, $100-150 installed).
Check Gas Connector
$15-50If leak is at stove connection.
- 1Turn off gas valve behind stove.
- 2Mix dish soap and water (50/50), apply to connections. Bubbles = leak.
- 3Replace connector with new stainless steel braided one ($15-30).
- 4Use yellow Teflon tape on threaded connections. Re-test with soapy water.
Call the Gas Company
$0If source is unknown or smell is strong.
- 1Open all windows. Do NOT operate light switches or create sparks.
- 2Leave the house with everyone including pets.
- 3Call gas company emergency line from outside.
- 4Gas company leak checks are FREE in most areas.
- 5Do not re-enter until given the all-clear.
When to Call a Professional
Strong gas smell filling the kitchen — evacuate immediately. Do NOT flip light switches.
Gas smell + hissing sound — gas actively leaking. Leave and call gas company from outside.
Gas smell + headache/dizziness — possible gas accumulation. Get to fresh air immediately.
Never search for a gas leak with a flame — use soapy water or call a professional
How to Prevent It
Install a natural gas detector in the kitchen ($30-50) — detects leaks your nose might miss.
Inspect stove connector when moving into a new home or moving the stove.
Replace gas connectors every 10 years or when stove is moved.
Use child-proof knob covers if children are present.
Annual gas appliance inspection — many gas companies offer this free.
Gas Safety in the Kitchen
Natural gas (methane) is odorless — gas companies add mercaptan so leaks are detectable by smell at concentrations as low as 1 part per billion, well before dangerous levels. Gas becomes explosive at 5-15% air concentration. At normal residential leak rates, reaching this level takes time in ventilated space — which is why opening windows is the critical first response.
The greatest danger is enclosed spaces — a closed kitchen with a slow overnight leak can accumulate enough gas to ignite from a light switch spark. Gas detectors are recommended, and you should never ignore even a faint persistent gas smell.
Frequently Asked Questions
A very brief smell when lighting a burner is normal. Any persistent gas smell is NOT normal and should be investigated.
Yes — from a leaky connector, failed wall valve, or oven safety valve. This is why shutoff valves exist behind the stove.
Mix dish soap and water (50/50). Apply to connections. Bubbles indicate a leak. Never use a flame.
Gas company emergency response is free. Stove connector replacement: $15-50 DIY, $100-200 with plumber. Gas line repairs in walls: $150-800.
Yes, annually. Many gas companies offer free safety inspections.