Goodman GMEC96 furnace 3 amber flashes: W2 Call Without W1
Professional repair
What do 3 amber flashes mean on a Goodman GMEC96 furnace? Three amber flashes mean the GMEC96 control is getting a second-stage heat call (W2) without a first-stage call (W1). The control ignores that call, so the furnace won't heat from it. Goodman's chart points to a faulty thermostat, faulty thermostat wiring, or improperly connected thermostat wires. One or two amber flashes are different: they show a normal first- or second-stage heat call.
Before you touch anything: the six signs that mean stop troubleshooting and call a pro →
A technician should check the thermostat and its wiring. The control stores this code in its fault history only once per power cycle.
What causes it (in order of likelihood)
- Faulty thermostat TECH
- Faulty thermostat wiring TECH
- Improperly connected thermostat wires TECH
Parts for this code
No specific part number is verified for this code — it typically points at wiring, power, a blown fuse, or communication between components rather than one standard replacement part. If your diagnosis does land on a replaceable component, match its part number against your model's parts list before ordering.
Questions about this code
What do 3 amber flashes mean on a Goodman GMEC96 furnace?
Three amber flashes mean the GMEC96 control is getting a second-stage heat call (W2) without a first-stage call (W1). The control ignores that call, so the furnace won't heat from it. Goodman's chart points to a faulty thermostat, faulty thermostat wiring, or improperly connected thermostat wires. One or two amber flashes are different: they show a normal first- or second-stage heat call.
How do I fix Goodman GMEC96 furnace 3 amber flashes?
Don't rewire the thermostat or the furnace control yourself. Book a technician, and mention any recent thermostat replacement or wiring work, since Goodman's chart points to the thermostat or its wiring.
How much does it cost to fix Goodman GMEC96 furnace 3 amber flashes?
The chart points to the thermostat or its wiring, so cost depends on whether a wire needs correcting or the thermostat needs replacing.
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.52 — “Furnace does not operate, three Amber flashes on control board / W2 call present without W1 / Faulty thermostat or thermostat wiring or improperly connected thermostat wires”
Verified against Goodman GMEC96 Service Manual, p.42 — “A call for 2nd stage without a call for 1st stage will be ignored, and a three amber flash code will be displayed on the LED.”
Verified against Goodman GMEC96 Service Manual, p.70 — “3 FLASHES = W2 PRESENT WITH NO W1”
Verified against Goodman Diagnostic Code Identification System (GMEC96; 3 Amber Flash) — “W2 Present with no W1”
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.