A leak is suspected
Leave the area and use the PHMSA emergency actions before any appliance troubleshooting.
Notice next: From well away, report the observations that caused the suspicion; do not re-enter to collect more.
Abnormal gas-burner flameU.S. national decision guide
Gas burner decision guide
Reviewed and updated September 24, 2026
What should you do about a yellow, uneven or unstable gas burner flame?
If you smell gas, hear hissing or otherwise suspect a natural-gas leak, leave immediately and do not operate the burner or its control. PHMSA says to avoid engines, flames, telephones and electrical switches in the suspected leak area, then call 911 from well away. Do not relight the burner for a photo, remain inside to investigate or return for another observation.
Only when there is no leak warning and the concern is limited to flame appearance should you use ordinary product observations. Turn the burner off with its normal control, do not adjust an air shutter or fuel setting, and wait until the cooktop is cool before noting the exact model, fuel type and model-permitted burner-cap position. Whirlpool notes that fuel type, cap position and minerals from some humidifiers can affect flame appearance on covered cooktops, so color alone does not identify a failed part.
Gas-leak emergency boundaryLeave first when a natural-gas leak is suspected; an abnormal flame by itself is not proof of a leak.
See what changes by location
What remains property-specific
Fuel, model and serving utility can change the response.
U.S. national guidance
What changes after you choose a location?
Choose a state to make the geographic boundary explicit.
A ZIP code does not prove price, coverage or job acceptance.
Applies nationallyThe decision structure is general, not a remote diagnosis.
Must be confirmed locallyProduct instructions and local requirements still control.
Separate safety, observed conditions and project scope
Which situation best matches the home?
Only flame appearance is abnormal
After the cooktop is off and cool, record the model, fuel type, affected burner and whether the cap was recently removed for cleaning.
Notice next: Use an existing safe photo if available; do not relight solely to create evidence.
The model-permitted cap check does not resolve it
Ask manufacturer support or a qualified gas-appliance professional to evaluate the persistent pattern without presuming a conversion or part replacement.
Notice next: Prepare the model, fuel type, cap history and which burners show the pattern.
Safe observation
What to record for ordinary service
Collect these only after the appliance is off and no leak is suspected.
These facts organize review; they do not diagnose combustion or gas supply.
What to record
- Exact cooktop model and stated fuel type
- One burner or several
- Whether a cap was removed or cleaned
- Existing photo and when the pattern began
Stop and get appropriate help
- Leave if odor, hissing or another observation makes you suspect a gas leak.
- Do not use switches, phones, engines or flames in the suspected leak area.
- Call 911 only from a location well away; do not search for the leak.
Short answers
Questions people ask before the call
Does a yellow flame prove a gas leak?
No. Flame appearance alone is not established as a leak; use separate leak observations and the emergency boundary.
Should I adjust the burner air or fuel setting?
No homeowner adjustment is supported here; use the exact model guidance and qualified review.
May I stay inside to call for help?
Not when a leak is suspected. Leave and call 911 from a location well away.
Sources and boundaries
What supports this guide?
- Whirlpool — Abnormal Gas Burner Flame ColorsFuel, cap-position and humidifier-mineral flame observations for covered cooktops. Scope: national. Source checked 2026-09-24. Confirm address-specific requirements with the relevant local authority or qualified professional.
- PHMSA — Recognizing and Responding to Pipeline EmergenciesEmergency actions only when a natural-gas leak is suspected. Scope: national. Source checked 2026-09-24. Confirm address-specific requirements with the relevant local authority or qualified professional.
Flame appearance alone does not prove a leak.
The Whirlpool guidance is product-family specific.
No gas adjustment or remote diagnosis is provided.
No provider or utility coverage is claimed.