Goodman Furnace: Flashback – burning inside the burner venturi

Flashback - burning inside the burner venturi on a Goodman furnace: Flashback is when the flame burns back inside the burner venturi instead of at the ports. You may see it at light-up, as the burner warms, or hear a pop at shut-off, called extinction pop. It isn't something to live with, since it can overheat the burner and damage parts. Get the gas and the burners looked at.

Homeowner with a furnace problem? Call (647) 657-2977 or book a service call — licensed technicians across Vaughan and the GTA.

Applies to: GMES9, GCES9, AMES9, ACES9, VMES9, VCES9 (single stage, 92% and 96%)

Common causes of flashback - burning inside the burner venturi

• Wrong gas pressure
• Burner out of alignment
• Wrong or blocked orifice

How to fix flashback - burning inside the burner venturi: step by step

1. Turn off power and gas first.
2. Check gas pressure and set it to the rating plate value. This is licensed gas technician work.
3. Check burner alignment. Adjust or replace the burner.
4. Check the orifice for blockage and for the right size.
5. Watch the flame through a few cycles, at light-up, warm-up and shut-off.

If the unit shows an error code, look it up: Goodman Furnace codes

Models

ACES96ACES960403BNAAACES960603BNAAACES960804CNAAACES961005CNAAACES961205DNAAAMES92AMES96AMES920403ANAAAMES920603BNAAAMES920803BNAAAMES920804CNAAAMES920805CNAAAMES921004CNAAAMES921005CNAAAMES921205DNAAAMES960403ANAAAMES960603BNAAAMES960803BNAAAMES960804CNAAAMES960805CNAAAMES961005CNAAAMES961205DNAAGCES96GCES960403BNAAGCES960603BNAAGCES960804CNAAGCES961005CNAAGCES961205DNAAGMES92GMES96GMES920403ANAAGMES920603BNAAGMES920803BNAAGMES920804CNAAGMES920805CNAAGMES921004CNAAGMES921005CNAAGMES921205DNAAGMES960403ANAAGMES960603BNAAGMES960803BNAAGMES960804CNAAGMES960805CNAAGMES961005CNAAGMES961205DNAAVCES96VCES960403BNAAVCES960603BNAAVCES960804CNAAVCES961005CNAAVMES96VMES960403ANAAVMES960603BNAAVMES960803BNAAVMES960804CNAAVMES961005CNAA