Goodman furnace: Gas Flow With No Call for Heat — 10 Red Flashes
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.
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 · how we verify
Related Goodman fault codes
These codes use the same gmec96 tri-color control — red fault flashes system.