Goodman Furnace: Delayed ignition – rough light-off
Delayed ignition - rough light-off on a Goodman furnace: Delayed ignition. Gas builds up in the chamber, lights late, thump. Gas work, licensed gas tech only. No bypassing safeties.
Applies to: GMES9, GCES9, AMES9, ACES9, VMES9, VCES9 (single stage, 92% and 96%)
Common causes of delayed ignition - rough light-off
- Wrong gas pressure
- Burners not seated in their slots or not level
- Carry-over (lighter tube) blocked
- Burner orifice bent or out of line
How to fix delayed ignition - rough light-off: step by step
- Qualified gas tech only. Never bypass or change safety controls.
- Check gas pressure, set to the rating plate value.
- Check burners sit in the locating slots, level front to rear and side to side.
- Clean the carry-over.
- Replace any deformed orifice or one not lined up with its burner.
- Watch several light-offs after, listen for the thump.
If the unit shows an error code, look it up: Goodman Furnace codes
Models
ACES96ACES960403BNAAACES960603BNAAACES960804CNAAACES961005CNAAACES961205DNAAAMES92AMES96AMES920403ANAAAMES920603BNAAAMES920803BNAAAMES920804CNAAAMES920805CNAAAMES921004CNAAAMES921005CNAAAMES921205DNAAAMES960403ANAAAMES960603BNAAAMES960803BNAAAMES960804CNAAAMES960805CNAAAMES961005CNAAAMES961205DNAAGCES96GCES960403BNAAGCES960603BNAAGCES960804CNAAGCES961005CNAAGCES961205DNAAGMES92GMES96GMES920403ANAAGMES920603BNAAGMES920803BNAAGMES920804CNAAGMES920805CNAAGMES921004CNAAGMES921005CNAAGMES921205DNAAGMES960403ANAAGMES960603BNAAGMES960803BNAAGMES960804CNAAGMES960805CNAAGMES961005CNAAGMES961205DNAAVCES96VCES960403BNAAVCES960603BNAAVCES960804CNAAVCES961005CNAAVMES96VMES960403ANAAVMES960603BNAAVMES960803BNAAVMES960804CNAAVMES961005CNAA
Source: Goodman Service and Troubleshooting GMES9*/GCES9*/AMES9*/ACES9*/VMES9*/VCES9* (RS6612016r3) , S-312 Checking for Delayed Ignition p.44. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.