Symptoms
- Flame tips are yellow or orange
- Flame looks flickery or uneven
- Soot appears on pots or the burner grate
- Faint odor while cooking
Likely causes
- CommonDirty or clogged burner portsDebris changes how air and gas mix, causing incomplete combustion.
- CommonBlocked air shutter behind the burnerDust or grease can restrict the air the burner needs to burn clean.
- PossibleSpilled food residue on the burner headResidue burns and discolors the flame.
- PossibleIncorrect burner cap for that positionSwapped caps between different-sized burners disrupt the air-fuel mix.
- Less commonGas supply or regulator issueRarely, incorrect gas pressure affects flame color across all burners.
What to do
- Turn off the burner and let it cool completely before cleaning.
- Remove the grate and burner cap and wash them in warm soapy water, then dry fully.
- Use a soft brush or toothpick to clear each port of the burner head.
- Check that the burner cap matches its base and is the correct size and orientation for that burner position.
- Wipe down the burner base and check the air shutter area for visible dust or grease buildup.
- Reassemble and relight, watching for a steady blue flame with only small yellow tips at most.
- If the flame is still yellow across all burners after cleaning, this may point to a supply issue that needs a professional look.
Tools and parts
- Soft brush
- Dish soap
Gas range burner capSearch: “gas range burner cap replacement”
When to call a pro
If cleaning doesn't restore a blue flame, or you notice soot buildup indoors, call a technician to check gas pressure and ventilation for carbon monoxide safety.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.