Goodman GMEC96 furnace 3 double red flashes: Second-Stage Pressure Switch Stuck Open
Professional repair
What do 3 double red flashes mean on a Goodman GMEC96 furnace? Three double red flashes mean the GMEC96's second-stage (high-fire) pressure switch is stuck open or there's an inducer error, and the furnace won't operate. Goodman's chart says to verify the switch and its tubing, and to confirm the inducer is running and pulling enough vacuum to engage the switch. Count the pairs: three double flashes are a different code from three single red flashes (first-stage switch) or six red flashes (pressure switch cycle lockout).
Easy to confuse with: Goodman GMEC96 furnace 6 red flashes (Pressure Switch Cycle Lockout)
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Power off the furnace and check the pressure switch tubing and its connections. Never jumper the switch.
Testing the switch, the inducer and the vacuum it pulls is technician work. DIY part cost: $25–60 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- A problem with the pressure switch tubing DIY-CHECKABLE
- Faulty second-stage (high-fire) pressure switch TECH
- Inducer not running or not pulling enough vacuum to engage the switch 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 3 double red flashes mean on a Goodman GMEC96 furnace?
Three double red flashes mean the GMEC96's second-stage (high-fire) pressure switch is stuck open or there's an inducer error, and the furnace won't operate. Goodman's chart says to verify the switch and its tubing, and to confirm the inducer is running and pulling enough vacuum to engage the switch. Count the pairs: three double flashes are a different code from three single red flashes (first-stage switch) or six red flashes (pressure switch cycle lockout).
How do I fix Goodman GMEC96 furnace 3 double red flashes?
With the power off, check the switch tubing and its connections, and never jumper the switch. Testing the switch and the inducer's vacuum needs a technician.
How much does it cost to fix Goodman GMEC96 furnace 3 double red flashes?
Cost depends on whether the tubing, the second-stage switch or the inducer is at fault. A technician's tests show which.
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 — “Second stage pressure switch stuck open / Verify pressure switch function & tubing, verify inducer operating and pulling enough vacuum to engage switch”
Verified against Goodman GMEC96 Service Manual, p.70 — “3 DOUBLE FLASHES = 2ND STAGE PRESSURE SWITCH STUCK OPEN/INDUCER ERROR”
Verified against Goodman Diagnostic Code Identification System (GMEC96; 3 Double Red) — “2nd-Stage Pressure Switch Stuck Open / Inducer Error”
Last verified 2026-10-20 · page updated 2026-10-20 · how we verify
Related Goodman furnace codes
These codes use the same gmec96 tri-color control — red and amber fault codes system.