Goodman furnace: Pressure Switch Cycle Lockout — 6 Red Flashes
Try DIY first, then call a pro
What do 6 red flashes mean on a Goodman GMEC96 furnace? The pressure-switch signal dropped out often enough during a heat cycle that the GMEC96 control locked the furnace out. This points to an intermittent draft problem rather than a steady switch state.
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
With power off, inspect the hose, outdoor vent ends, and condensate trap for an obvious blockage.
Recurring six-flash lockouts require draft-pressure and inducer testing. DIY part cost: $25–60 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Loose, cracked, wet, or partially blocked pressure-switch hose DIY-CHECKABLE
- Blocked intake, exhaust, or condensate drain DIY-CHECKABLE
- Weak inducer or failing pressure switch 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.
| Pattern | Meaning |
|---|---|
| Open Rollout Switch or Open Fuse — 5 Red Flashes | |
| External Lockout From Retries — 7 Red Flashes | |
| Open Limit Switch — 4 Red Flashes | |
| External Lockout From Recycles — 8 Red Flashes |