Goodman GMEC96 furnace 10 red flashes: Gas Flow With No Call for Heat
Safety issue — act now
What do 10 red flashes mean on a Goodman GMEC96 furnace? The GMEC96 control is detecting gas flow when the thermostat is not calling for heat. The official wiring legend treats this as a separate ten-flash fault, not a normal operating light.
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 →
Shut off the furnace and the appliance gas valve. If you smell gas, leave and call the gas utility; otherwise arrange immediate 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, stuck, or closing too slowly TECH
- Gas-valve wiring or control-board 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 do 10 red flashes mean on a Goodman GMEC96 furnace?
The GMEC96 control is detecting gas flow when the thermostat is not calling for heat. The official wiring legend treats this as a separate ten-flash fault, not a normal operating light.
How do I fix Goodman GMEC96 furnace 10 red flashes?
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 immediate licensed service.
How much does it cost to fix Goodman GMEC96 furnace 10 red flashes?
The code can't predict cost. A leaking or stuck gas valve, valve wiring, or a control fault are different repairs, and safety should come before price.
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.70-71
Last verified 2026-07-06 · page updated 2026-10-03 · how we verify
Related Goodman furnace codes
These codes use the same gmec96 tri-color control — red fault flashes system.