Goodman GMEC96 furnace 1 red flash: Flame Sensed With No Flame Expected
Safety issue — act now
What does 1 red flash mean on a Goodman GMEC96 furnace? The GMEC96 control is detecting flame current when no flame should be present. This code belongs to the GMEC96 tri-color control; it is not the same as the one-flash ignition-lockout code used by older Goodman boards.
This condition involves the gas or combustion side. If you smell gas or a CO alarm sounds: leave, then call your gas utility. Diagnostic info here is reference — combustion repairs are for licensed technicians. All six emergency signs →
Turn the furnace off. If you smell gas or can see flame with no heat call, leave the area and call the gas utility; otherwise arrange same-day licensed service. DIY part cost: $90–200 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Gas valve leaking or closing too slowly TECH
- Flame-sense wire shorted to ground or control fault TECH
Parts referenced by this code
Always match parts against your model's parts list — part numbers vary within a series.
Questions about this code
What does 1 red flash mean on a Goodman GMEC96 furnace?
The GMEC96 control is detecting flame current when no flame should be present. This code belongs to the GMEC96 tri-color control; it is not the same as the one-flash ignition-lockout code used by older Goodman boards.
How do I fix Goodman GMEC96 furnace 1 red flash?
Stop troubleshooting. If you smell gas, leave without using switches and call the gas utility or 911 from outside. Otherwise set the thermostat to off and arrange same-day licensed service.
How much does it cost to fix Goodman GMEC96 furnace 1 red flash?
This code doesn't indicate a price. A leaking or slow-closing gas valve, a shorted flame-sense wire, and a control fault are different repairs, so arrange service promptly.
Applies to
GMEC96
Different Goodman generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against Goodman GMEC96 Service Manual, p.52/70-71
Last verified 2026-07-06 · page updated 2026-10-03 · how we verify
Other Goodman furnace codes
These links include other Goodman model families. Code meanings can change by model and control board, so confirm your model and service manual before using a definition.