Goodman furnace: First-Stage Pressure Switch Stuck Closed — 3 Red Flashes
Professional repair
What do 3 red flashes mean on a Goodman GMEC96 furnace? On the GMEC96 control, three red flashes mean the first-stage pressure switch is stuck closed or the inducer circuit is reporting the wrong state. Match the model and the wiring diagram on the blower door before using this definition.
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Power off the furnace and check the first-stage switch hose for a pinch or obvious damage. Never jumper the switch.
The draft circuit needs live-sequence testing by a technician. DIY part cost: $25–60 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- First-stage pressure switch stuck closed TECH
- Shorted pressure-switch wiring or inducer-control error 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.