Goodman furnace: External Lockout From Recycles — 8 Red Flashes
Try DIY first, then call a pro
What do 8 red flashes mean on a Goodman GMEC96 furnace? The burners lit, but the control lost flame proof repeatedly and used up its recycle limit. That is different from seven flashes, where ignition never completed successfully.
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Power off the furnace and clean the flame sensor. Check that the intake and exhaust terminals are clear.
Repeated flame loss needs combustion, gas-pressure, and flame-current measurements. DIY part cost: $8–15 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Weak or unstable flame-sensor signal DIY-CHECKABLE
- Intermittent gas pressure, venting, or burner problem 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.53
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.