Combustion Problems

While inspecting gas-fired heating appliances, inspecting the appearance and/or condition of the burner flames may reveal some combustion-related problems.

Below is a list of some typical combustion issues which may be initially identified by the appearance and/or condition of the burner flames, along with some of the possible causes and remedies:

Flame Condition	Possible Cause	Remedy
Lifting Flame	Gas pressure too high	Reduce gas pressure
	Incorrect orifice	Replace
	Too much primary air	Decrease primary air
Yellow Tipping	Shortage of primary air	Increase primary air
	Dirty Burners	Clean burners
	Incorrect orifice	Replace
Flashback	Primary airflow too high	Decrease primary air
	Low manifold pressure	Adjust to rated value
Extinction Pop	Defective gas valve	Replace
Wavering Flames	Drafts in combustion chamber	Check panels
	Cracked heat exchanger	Replace
Delayed Ignition	Low gas pressure	Adjust gas pressure
	Slow opening gas valve	Replace gas valve
	Misdirected pilot flame	Redirect
	Dirty orifice or burners	Clean
	Drafts across the burners	Check furnace panels
Flame Rollout	Shortage of combustion air	Discover cause and resolve

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